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New data on ptyctimous mites (Acari, Oribatida) from the Oriental region, with descriptions of two new species

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The present study is based on ptyctimous oribatid mite material collected from the Oriental region (Sri Lanka, Thailand, Malaysia, Indonesia, Macau Peninsula, Taiwan). A list of identified taxa, including 33 species from 15 genera and six families, is presented. Two new species, Euphthiracarus (Pocsia) insperatus Niedbała sp. nov. (Euphthiracaridae) from Indonesia and Hoplophthiracarus paraconcinuus Niedbała sp. nov. (Steganacaridae) from Malaysia are described. Morphological additions to Mesoplophora (Parplophora) brevicarinata, Acrotritia ardua, A. paraardua, A. sterigma, Plonaphacarus kugohi, and P. protrusus are presented. Deuto- and tritonymph of Apoplophora phalerata are described. Mesoplophora (Parplophora) flavida and Indotritia (Indotritia) krakatauensis are recorded for the first time in Sri Lanka, Austrotritia robusta, Sabahtritia sarawak and Phthiracarus pygmaeus in Indonesia, Microtritia minima, Atropacarus (Atropacarus) striculus, Plonaphacarus foveolatus, and P. protrusus in Taiwan. Acrotritia mahunkai and A. paraardua are recorded for the first time in the Oriental region.
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Systematic & Applied Acarology 25(3): 444–458 (2020)
https://doi.org/10.11158/saa.25.3.6
ISSN 1362-1971 (print)
ISSN 2056-6069 (online)
444 © Systematic & Applied Acarology Society
Article http://zoobank.org/urn:lsid:zoobank.org:pub:ED6E2FDC-F7BF-49DA-B86A-9D760D856263
New data on ptyctimous mites (Acari, Oribatida) from the Oriental
region, with descriptions of two new species
WOJCIECH NIEDBAŁA1& SERGEY G. ERMILOV2*
1Department of Animal Taxonomy and Ecology, Faculty of Biology, Adam Mickiewicz University, Poznań, Poland. E-mail:
wojciech.niedbala@amu.edu.pl
2Institute of Environmental and Agricultural Biology (X-BIO), Tyumen State University, Tyumen, Russia.
E-mail: ermilovacari@yandex.ru
*Corresponding author
Abstract
The present study is based on ptyctimous oribatid mite material collected from the Oriental region (Sri Lanka,
Thailand, Malaysia, Indonesia, Macau Peninsula, Taiwan). A list of identified taxa, including 33 species from
15 genera and six families, is presented. Two new species, Euphthiracarus (Pocsia) insperatus Niedbała sp.
nov. (Euphthiracaridae) from Indonesia and Hoplophthiracarus paraconcinuus Niedbała sp. nov.
(Steganacaridae) from Malaysia are described. Morphological additions to Mesoplophora (Parplophora)
brevicarinata, Acrotritia ardua, A. paraardua, A. sterigma, Plonaphacarus kugohi, and P. protrusus are
presented. Deuto- and tritonymph of Apoplophora phalerata are described. Mesoplophora (Parplophora)
flavida and Indotritia (Indotritia) krakatauensis are r ecord ed for the fi rst time in S ri Lan ka, Austrotritia robusta,
Sabahtritia sarawak and Phthiracarus pygmaeus in Indonesia, Microtritia minima, Atropacarus (Atropacarus)
striculus, Plonaphacarus foveolatus, and P. protrusus in Taiwan. Acrotritia mahunkai and A. paraardua are
recorded for the first time in the Oriental region.
Key words: ptyctimous mites, fauna, morphology, systematics, Asia
Introduction
This work is based on a random set of previously unstudied material of ptyctimous oribatid mites
(Acari, Oribatida) collected from different samples of the Oriental region (Macau Peninsula,
Indonesia, Malaysia, Sri Lanka, Taiwan, and Thailand). The primary goal of this paper is to present
a list (including new records) of the identified taxa.
In the course of taxonomic identification, we found two new species, one (from Malaysia)
belonging to the genus Hoplophthiracarus Jacot, 1933 (Steganacaridae), and the other (from
Indonesia) to Euphthiracarus (Pocsia) Mahunka, 1983 (Euphthiracaridae). The secondary goal of
this paper is to describe and illustrate these new species. The generic characters, identification keys
and analysis on geographical distribution to Hoplophthiracarus and Euphthiracarus (Pocsia) were
presented by Niedbała (2000).
Additionally, the supplementary descriptions of Mesoplophora (Parplophora) brevicarinata
Niedbała, 2008, Acrotritia ardua (C.L. Koch 1841), A. paraardua Niedbała & Starý, 2015, A.
sterigma (Niedbała 1998), Plonaphacarus kugohi (Aoki 1959), and P. protrusus Liu, Wu & Chen,
2011, and description of nymphal instars of Apoplophora phalerata Niedbała, 2000 are presented.
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2020 NIEDBAŁA & ERMILOV: PTYCTIMOUS MITES FROM THE ORIENTAL REGION
Material and methods
Material
Ptyctimous mites were collected in the following sites:
Sri Lanka: SL—Sabaragamuwa Province, Polgampola, 06°27'47.2"N, 080°12'38.8"E, 42 m
a.s.l., litter in the mixed forest near the Thambadola Ella waterfall, 24.01.2019 (O. Joharchi, S.G.
Ermilov & A.A. Khaustov).
Thailand: Th—Phuket Province, close to Karon Beach, 7°49'32.8"N, 98°17'46.5"E, litter in
forest vegetation, 4.04.2017 (A.A. Khaustov).
Malaysia: Ma-1—Perak District, 50 km NE to Gerik, Titiwangsa, 05°36'17.4"N, 101°32'3
4.0"E, 1100 m a.s.l., forest complex Belum–Temenggor, litter, 30 March–13April 2015 (E. Jendek
& O. Šauša); Ma-2—Sarawak, Santuborg, 1o44'50.6"N, 110o19'49.6"E, litter in deciduous forest,
29.08.2018 (M. Szkudlarek); Ma-3—Sabah, Kinabalu National Park, Botanical Garden, 1500 m
a.s.l., moss and dry leaves, 06.10.2019 (G. Gabryś).
Indonesia: In-1—Sumatra, Bukit Duabelas landscape, 02°05'30.7''S, 102°48'30.7''E, rubber
agroforest, litter, November 2013 (B. Klarner); In-2—Sumatra, Bukit Duabelas landscape,
02°01'49.7''S, 102°46'16.7''E, jungle Rubber agroforest, soil and litter, November 2013 (B. Klarner);
In-3—Sumatra, Bukit Duabelas landscape, 02°03'46.7''S, 102°48'03.5''E, jungle rubber agroforest,
soil and litter, November 2013 (B. Klarner); In-4—Sumatra, Bukit Duabelas landscape,
01°58'55.1''S, 102°45'02.7''E, forest site, litter, November 2013 (B. Klarner); In-5—Sumatra,
Harapan landscape, 01°49'31.9''S, 103°17'39.2''E, jungle rubber agroforest, soil and litter, November
2013 (B. Klarner); In-6Sumatra, Harapan landscape, 02°09'09.9''S, 103°21'43.2''E, forest site,
litter, November 2013 (B. Klarner); In-7—Sumatra, Harapan landscape, 02°09'09.9''S,
103°21'43.2''E, forest site, soil and litter, November 2013 (B. Klarner); In-8—Sumatra, Harapan
landscape, 01°56'33.9''S, 102°34'52.7''E, forest site, litter, November 2013 (B. Klarner); In-9
Sumatra, Bukit Duabelas landscape, 02°08'35.6''S, 102°51'04.7''E, Jungle Rubber agroforest, soil,
November 2013 (B. Klarner); In-10—Sumatra, Bukit Duabelas landscape, 01°59'42.5''S,
102°45'08.1''E, forest site, litter, November 2013 (B. Klarner); In-11—Sumatra, Bukit Duabelas
landscape, 02°00'57.3''S, 102°45'12.3''E, jungle rubber agroforest, soil, November 2013 (B.
Klarner); In-12—Sumatra, Bukit Duabelas landscape, 02°08'35.6''S, 102°51'04.7''E, jungle rubber
agroforest, soil, November 2013 (B. Klarner); In-13—Sumatra, Bukit Duabelas landscape,
02°08'35.6''S, 102°51'04.7''E, jungle rubber agroforest, litter, November 2013 (B. Klarner);
Macau Peninsula: MP-1—Macau Peninsula, Ilha Verde Hill, 22.2117°N, 113.5375°E, 5 m
a.s.l., 13.08.2017 (C.M. Leong); MP-2—Macau Peninsula, Siu Tam Hill, 22.1614°N, 113.5502°E,
52 m a.s.l., 15.07.2017 (C.M. Leong).
Taiwan: Ta-1—New Taipei City, Wulai Dist., Drulu Mt., 24°49.544'N, 121°30.437'E, 884 m
a.s.l., soil, 13.07.2017 (J.R. Liao & H.C. Lee); Ta-2—Miaoli County, Tai'an Township, Xuejian
Area, 24°25.464'N, 121°00.796'E, 1855 m a.s.l., moss, 13.11.2017 (J.R. Liao & H.C. Lee).
All materials (in test tubes with ethanol) are deposited in the collection of the Department of
Animal Taxonomy and Ecology, Adam Mickiewicz University, Poznań, Poland (DATE).
The authorities of species in the List of identified ptyctimous mites section are not included in
the References section.
Methods
Specimens (sex not identified) were mounted in lactic acid on temporary cavity slides for
measurement and illustration. Body length was measured in lateral view, from the tip of the rostrum
to the posterior edge of the ventral plate. Notogastral width refers to the maximum width of the
notogaster in dorsal view. Lengths of body setae were measured in lateral aspect. All body
446 SYSTEMATIC & APPLIED ACAROLOGY VOL. 25
measurements are presented in micrometers. Morphological terminology used in this paper follows
that of F. Grandjean: see Travé & Vachon (1975) for references, and Norton & Behan–Pelletier
(2009), for overview.
The identification and the illustrations of mite specimens were performed under a phase contrast
microscope “Olympus BX50”, equipped with a drawing attachment.
The following morphological abbreviations are used: ro, le, in, exr o s t r a l , l a m e l l a r ,
interlamellar and exobothridial setae, respectively; sssensillus; c, d, f, h, psnotogastral setae; an,
adanal and adanal setae, respectively; ianotogastral lyrifissure; hsubcapitular seta, dleg
seta.
List of identified ptyctimous mites
Mesoplophoridae
Mesoplophora (Parplophora) brevicarinata Niedbała, 2008: In-3 (1 ex.). Distribution:
Indonesia.
Mesoplophora (Parplophora) flavida Niedbała, 1985: SL (10 ex.). Distribution: Oriental region,
northern China. New record of the species in Sri Lanka.
Mesoplophora (Parplophora) leviseta Hammer, 1979: In-2 (1 ex.). Distribution: Pantropical
and Subtropical regions. New record in Sumatra.
Apoplophora cristata Mahunka, 1991: Ma-1 (10 ex.). Distribution: Malaysia.
Apoplophora pantotrema (Berlese, 1913): MP-2 (1 ex.), In-5 (1 tritonymph), In-7 (8 ex.), Ta-1
(1 ex.). Distribution: Pantropical and Subtropical regions.
Apoplophora phalerata Niedbała, 2000: In-5 (1 deutonymph, 1 tritonymph); In-11 (6 ex.).
Distribution: Oriental region.
Oribotritiidae
Oribotritia chichijimensis Aoki, 1980: MP-1 (3 ex.), MP-2 (1 ex.). Distribution: eastern
Palaearctic and Oriental regions.
Indotritia (Indotritia) javensis (Sellnick 1923): MP-1 (3 ex.), MP-2 (2 ex.), Ma-1 (11 ex.).
Distribution: Semicosmopolitan.
Indotritia (Indotritia) krakatauensis (Sellnick, 1923): SL (1 ex.). Distribution: Pantropical and
Subtropical regions. New record of the species in Sri Lanka.
Austrotritia robusta Niedbała & Corpuz-Raros, 1998: In-1 (2 ex.). Distribution: Australian and
Oriental regions. New record of the species in Indonesia.
Synichotritiidae
Sabahtritia sarawak Mahunka, 1996: In-9 (2 ex.). Distribution: Oriental region. New record of
the species in Indonesia.
Euphthiracaridae
Euphthiracarus (Pocsia) insperatus Niedbała sp. nov.: In-11 (1 ex.).
Acrotritia ardua (Koch 1841): Ta-1 (6 ex.), Ta-2 (4 ex.). Distribution: Cosmopolitan.
Acrotritia curticephala
(Jacot 1938): Ma-2 (6 ex.), SL (22 ex.). Distribution: Semicosmopolitan. New
record in Sarawak.
Acrotritia mahunkai Niedbała & Liu, 2019: In-1 (2 ex.). Distribution: Palaearctic region. New
record of the species in the Oriental region.
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2020 NIEDBAŁA & ERMILOV: PTYCTIMOUS MITES FROM THE ORIENTAL REGION
Acrotritia paraardua Niedbała & Starý, 2015: Ta-1 (2 ex.). Distribution: Madagascar. New
record of the species in the Oriental region.
Acrotritia sterigma (Niedbała 1998): Ma-3 (1 ex.). Distribution: eastern Pantropica l ,
Subtropical and Sub-Antarctic regions. New record in Sabah.
Acrotritia vestita (Berlese 1913): Ma-3 (3 ex.). Distribution: Pantropical and Subtropical
regions.
Microtritia minima (Berlese 1904): Ta-2 (1 ex.). Distribution: Semicosmopolitan. New record
of the species in Taiwan.
Microtritia tropica Märkel, 1964: In-1 (4 ex.). Distribution: Pantropical and Subtropical
regions. New record in Sumatra.
Phthiracaridae
Phthiracarus pygmaeus Balogh, 1958: In-6 (1 ex.), In-7 (1 ex.), SL (2 ex.). Distribution:
Pantropical and Subtropical regions. New record in Indonesia.
Steganacaridae
Plonaphacarus foveolatus Liu, Wu & Chen, 2011: T a - 2 ( 1 e x . ) . D i s t r i b u t i o n : s o u t h e r n C h i n a .
New record of the species in Taiwan.
Plonaphacarus kugohi (Aoki 1959): MP-2 (1 ex.), In-8 (1 ex.), Ma-1 (18 ex.), SL (6 ex.), Th (17
ex.). Distribution: Pantropical, Subtropical and southern Palaearctic regions.
Plonaphacarus loebli (Mahunka 1985): In-10 (3 ex.). Distribution: Oriental region. New record
in Sumatra.
Plonaphacarus protrusus Liu, Wu & Chen, 2011: Ta-2 (5 ex.). Distribution: southern Chin a .
New record of the species in Taiwan.
Hoplophthiracarus paraconcinuus Niedbała sp. nov.: Ma-1 (4 ex.).
Austrophthiracarus pseudotuberculatus (Mahunka, 2008): Th (15 ex.). Distribution: Thailand.
Austrophthiracarus pullus (Niedbała 1989): In-4 (1 ex.), In-12 (1 ex.). Distribution: Oriental
region. New record in Sumatra.
Notophthiracarus lienhardi (Mahunka 1996): Ma-1 (5 ex.). Distribution: Oriental region.
Atropacarus (Hoplophorella) cucullatus (Ewing 1909): In-10 (1 ex.). Distribution: Semi-
cosmopolitan.
Atropacarus (Hoplophorella) hamatus (Ewing, 1909): Ma-2 (5 ex.). Distribution:
Semicosmopolitan. New record in Sarawak.
Atropacarus (Hoplophorella) vitrinus (Berlese,1913): In-13(1ex.). Distribution:
Semicosmopolitan.
Atropacarus (Atropacarus) striculus (C.L. Koch, 1836): Ta-1 (1 ex.). Distribution:
Semicosmopolitan. New record of the species in Taiwan.
Taxonomy
Euphthiracarus (Pocsia) insperatus Niedbała sp. nov.
(Fig. 1AG)
Description
Measurements. Holotype: prodorsum: length 348, width 257, height 141; prodorsal setae: ss 81,
in 190, le 159, ro 134; notogaster: length 626, width 454, height 515; notogastral setae: c1 131, cp
154, d1 83, c1/c1-d1=0.8, h1 86, h2 101, h3 190, ps3 131; genitoaggenital region 169 × 76, anoadanal
region 298 × 45. Rather large species.
448 SYSTEMATIC & APPLIED ACAROLOGY VOL. 25
Integument. Colour light brown. Surface of body covered with sculpture similar to fingerprint.
Prodorsum. Median crista and three pairs of lateral lamellae present, lower lamellae longest,
middle ones shortest. Scales situated above bothridia. Sensilli with long, narrow pedicel and small
swollen distal head. Rostral, lamellar and interlamellar setae long, smooth, pointed distally.
Exobothridial setae and their alveoli absent. Comparative lengths of setae: in>le>ro>ss.
FIGURE 1AG. Euphthiracarus (Pocsia) insperatus Niedbała sp. nov. (holotype): Aprodorsum, dorsal
view; B prodorsum, lateral view; Copisthosoma, lateral view; Dmentum of subcapitulum; Epalp; F
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2020 NIEDBAŁA & ERMILOV: PTYCTIMOUS MITES FROM THE ORIENTAL REGION
left side of ventral plates including parts of notogaster; G—trochanter and femur of leg I. Scale bars 100 µm (A,
B, C, F), 50 µm (E), 25 µm (D, G).
Notogaster. Fourteen pairs of attenuate setae present, sparsely covered with small spines,
pointed distally. Setae cp and h3 longest, c1-c3 of average length, c1/c1-d1<1.0, h1 and ps1 shortest.
Setae c1-c3 remote from anterior border, c1 further than c2 and c3.
Ventral region. Palps with three segments, formula: 2-1-8(1). Setae h of mentum considerably
longer than distance between them. Suture between genitoaggenital and anoadanal plates absent.
Genitoaggenital plates with four pairs of setae, anterior pair very short, three posterior pairs strong,
very long, flexible; two pairs of aggenital setae present. Two pairs of anterior setae of anoadanal
plates (an3 and ad3) minute, posterior setae long, attenuate, flexible, ad2 longest, an1 shortest.
Lyrifissures iad invisible.
Legs. Chaetome of legs (without tarsi): I: 1-2-5(2)-5(1), II: 1-3-3(1)-4(1), III: 2-2-2(1)-2(1), IV:
2-1-1(1)-2(1). All tarsi monodactylous.
Material examined
Holotype: In-11.
Type deposition
DATE.
Etymology
The specific name insperatus is Latin for “unexpected” and refers to unusual for this genus
position of prodorsal scales, above of bothridia.
Comparison and diagnosis
The new species is easily distinguishable from congeners by the presence of prodorsal scales
situated above the bothridia, median crista and three pairs of lateral lamellae of prodorsum, three
pairs of very long genital setae and sculpture of surface of body similar to fingerprint, and by the
absence of suture between genitoaggenital and anoadanal plates.
Together with the newly described one we know so far 19 species of the subgenus Pocsia. In six
of them we have identified certain variations of the morphological characters different from those
provided in the diagnosis of the subgenus.
Euphthiracarus (P.) insperatus sp. nov. is the only species with scales of prodorsum situated
above bothridia. This is a character typical for the completely different genus Oribotritia, the other
exception is the absence of suture between genitoaggenital and anoadanal plates.
Three species: E. (P.) dubius Niedbała & Schatz, 1996 from Guatemala, E. (P.) insolitus
Niedbała, 2004 and E. (P.) microsetus Starý, 1993 both from Cuba have setae of prodorsum typical
of the subgenus Euphthiracarus Ewing, 1917, it means rostral setae situated anterior to lamellar
setae; however, in the last two species, lamellar setae are widely spaced, like in Pocsia. Space
between them is almost as wide as between the interlamellar setae.
Two species: Afrotropical E. (P.) disparilis Niedbała, 1988 and E. (P.) medius Niedbała, 2014
from Vietnam do not have suture between genitoaggenital and anoadanal plates. However, the
taxonomic value of the presented exceptions requires studies of more species and we think it is too
early to revise this subgenus.
Hoplophthiracarus paraconcinuus Niedbała sp. nov.
(Fig. 2AH)
Description
450 SYSTEMATIC & APPLIED ACAROLOGY VOL. 25
Measurements. Holotype: prodorsum: length 164, width 126, height 66; prodorsal setae: ss 73,
in 66, ro 33; notogaster: length 328, width 227, height 207; notogastral setae: c1 66, c1/c1d1=0.8, h1
63, ps1 61; genitoaggenital plate 88 × 76; anoadanal plate 114 × 76. Paratypes: prodorsum: length
164–174, height 66–78; notogaster: length 308–333, height 202–222. Species of medium size.
Integument. Colour brown. Surface of body covered with deep, distanced alveoli.
Prodorsum. One pair of distinct and short sigillar fields present. Lateral carinae weakly
expressed reaching sinus. Sensilli relatively long, with narrow pedicel and fusiform head rounded
distally and covered with thin setae. Rostral setae stout, erect, covered with fine setae, rather blunt
distally. Lamellar and exobothridial setae vestigial. Interlamellar setae stout, erect, covered with
small setae, but rather on one side. Comparative lengths of setae: ss>in>ro.
Notogaster. 15 pairs of stout setae present, similar to interlamellar setae, covered with small
setae, but rather on one side, c1<c1-d1. Setae c1 and c3 located near anterior border, c2 remote from
anterior border. Vestigial setae not visible because strong integument. Two pairs of lyrifissures ia
and im present.
Ventral region. Setae h of mentum as long as distance between them. Genitoaggenital plates
with nine pairs of setae with formula: 6: 3. Anoadanal plates each with five well-developed setae,
ad2 and ad3 (bent distally) thicker than ad1 and anal setae, ad2 longest, ad3 shortest.
Legs. Formulas of setae and solenidia of “reduced type. Setae v on femora I absent. Setae d on
femora I distinctly remote from distal ends of articles.
Material examined
Holotype and three paratypes: Ma-1.
Type deposition
DATE.
Etymology
The prefix para is Latin meaning “near” and refers to the similarity the new species with
Hoplophthiracarus concinuus Niedbała, 1982.
Comparison
The new species is similar to the oriental species Hoplophthiracarus concinuus Niedbała, 1982
in a somewhat similar shape of sensilli, interlamellar and notogastral setae and foveolate surface of
body. The differences are the absence of a narrow dorsal crista which is present in H. concinuus, the
erect, thick rostral setae distanced one from another (versus setiform, procumbent rostral setae and
located close to each other), lamellar and exobothridial setae vestigial (versus well developed), setae
h of mentum as long as distance between them (versus h>h-h), setae g6 of genitoaggenital plate with
other setae along the proximal border (versus setae g6 remote from proximal border), setae v’ of
femora I absent (versus setae v’ present).
Mesoplophora (Parplophora) brevicarinata Niedbała, 2008
(Fig. 3A, B)
Supplementary description
Measurements. Prodorsum: length 192, width 139, height 101; prodorsal setae: ss 96, in 104, le
78, ro 61, ex 13; notogaster: length 255, width 200, height 129; notogastral setae: c1 68, c2 78, c3 28,
d1 76, e1 78.
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2020 NIEDBAŁA & ERMILOV: PTYCTIMOUS MITES FROM THE ORIENTAL REGION
FIGURE 2AH. Hoplophthiracarus paraconcinuus Niedbała sp. nov. (holotype): A—prodorsum, dorsal view;
B—prodorsum, lateral view; C—opisthosoma, lateral view; D—seta c1; E—mentum of subcapitulum; F—left
genitoaggenital and anoadanal plates; G—trochanter and femur of leg I; H—tibia of leg IV. Scale bars 100 µm
(A, B, C), 50 µm (F), 25 µm (D, E, G, H).
452 SYSTEMATIC & APPLIED ACAROLOGY VOL. 25
Integument. Colour yellow pale.
Prodorsum. Sensilli long covered with 15 or 16 cilia. Lamellar and interlamellar setae longer
and thicker than rostral setae. Exobothridial setae minute. All setae (except ss) smooth.
Notogaster. Eight pairs of long setae (except minute c3) setae present.
Ventral region. Three pairs of anal setae. Genital setae not visible. Ventral setae not observed
because all are broken.
Remarks
This is undoubtedly this Indonesian species (e.g., sensilli long, covered with 14-16 cilia;
lamellar and interlamellar setae longer and thicker than rostral setae; exobothridial setae minute;
notogaster with eight pairs of setae long (except minute c3) setae; three pairs of anal setae) although
the damage of the ventral setae of body.
Apoplophora phalerata Niedbała, 2000
(Fig. 3C, D)
Description of nymphs
Deutonymph. Measurements. Prodorsum: length 172, width 126, height 86; prodorsal setae: ss
111, in and le 45, ro 33, ex 28; notogaster: length 228, width 167, height 152; notogastral setae: c1
30, c2 and c3 28, d3 45, e1 38.
Integument. Colour yellow pale.
Prodorsum. Sensilli long covered with about 20 cilia. Exobothridial setae relatively long. All
setae ciliate. Comparative lengths of setae: ss>in=le>ro>ex.
Notogaster. Setae of similar shape, setiform (shortest and cp longest). All setae (except smooth
c3) ciliate.
Ventral region. Plates Q with one pair of setae, plates P with two pairs of setae; two pairs of
genital setae and three pairs of anal setae present.
Tritonymph. Measurements. Prodorsum: length 197, width 139, height 88; prodorsal setae: ss
106, in 61, le 56, ro 15, ex 38; notogaster: length 268, width 200, height 185; notogastral setae: c1
43, c2 56, c3 23, d2 56, d3 74, e1 63.
Integument. Colour yellow pale.
Prodorsum. Sensilli long covered with more than 30 cilia. Exobothridial setae relatively l o n g .
All setae ciliate. Comparative lengths of setae: ss>in >le>ex>ro.
Notogaster. Five pair of anterior setae thin, posterior seven pairs of setae considerably thicker,
all setae of similar shape, setiform (c3 shortest and cp longest). All setae (except smooth c3) ciliate.
Ventral region. Plates Q with one pair of setae, plates P with two pairs of setae; three pairs of
genital setae and four pairs of anal setae present.
Remarks
We knows only in genus Apoplophora the tritonymph of A. pantotrema (Niedbała 1984;
Niedbała & Ermilov 2013; Liu 2016). Presented above tritonymph of A. phalerata differs from
tritonymph of A. pantotrema by the longer exobothridial setae, more number of cilia on sensilli, setae
c3 short (versus setae c3 similar in length with other c setae in A. pantotrema), anterior setae of
notogaster are thin, posterior setae thicker (versus setae of notogaster more or less equal in
thickness).
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FIGURE 3AH. A, B. Mesoplophora (Parplophora) brevicarinata Niedbała, 2008: Aprodorsum with
anterior part of notogaster, dorsal view; Blateral view of body (legs remove); C, D. Apoplophora phalerata
Niedbała, 2000: Cdeutonymph, lateral view of body (legs remove); D—tritonymph, lateral view of body (legs
removed); E—Acrotritia sterigma (Niedbała, 1998), prodorsum with anterior part of notogaster, lateral view.
F–H. Plonaphacarus kugohi (Aoki 1959): Fprodorsum, lateral view; Gright anoadanal plate, lateral view;
H—trochanter and femur of leg I. Scale bars 100 µm (A, B, C, D, E, F), 50 µm (G), 25 µm (H).
454 SYSTEMATIC & APPLIED ACAROLOGY VOL. 25
Acrotritia ardua (C.L. Koch, 1841)
(Fig. 4FH)
Supplementary description
Measurements. Prodorsum: length 202, width 139, height 83; prodorsal setae: ss 83, in 94, le 61,
ro 48, ex 10, inin 71, lele 40, roro 35, roro/lele 0.87, role 43, lein 61, role/lein 0.70;
notogaster: length 389, width 227, height 247; notogastral setae c1 56, c1/c1d1 0.6, h1 and p1 48.
Remarks
In the same sample (Ta-1) of Taiwan, Acrotritia ardua and A. paraardua were found, however,
A. ardua differs from A. paraardua by the shape of sensilli (not so clavate as in A. paraardua) and
the presence of genital setae g1 in progenital position (all genital setae situated posteriorly of
progenital area in A. paraardua) (Niedbała & Starý 2015).
Acrotritia paraardua Niedbała & Starý, 2015
(Fig. 4AE)
Supplementary description
Measurements. Prodorsum: length 263, width 202, height 116; prodorsal setae: ss 63, in 121, le
86, ro 53, ex 10, in-in 96, le-le 56, ro-ro 45, ro-ro/le-le 0.82, ro-le 68, le-in 81, ro-le/le-in 0.84;
notogaster: length 535, width 323, height 333; notogastral setae c1 88, c1/c1-d1 0.7, h1 and ps1 81;
genitoaggenital plate 197 × 71, anoadanal plate 242 × 61.
Legs. Сhaetome (tarsi not studied): I: 1-3-5(2)-5(1), II: 1-4-4(1)-4(1), III: 2-2-2(1)-3(1), IV: 2-
1-2(0)-3(1).
Remarks
All morphological characters of this species are identical as in holotype, only integument is
finely punctate but also slightly rugged, and chaetome of legs is almost identical with chaetome of
holotype only one seta of genua II is more.
The presence of this species in Taiwan is unexpected. It was described from Madagascar and
only from there, so far noted, considered endemic. It is probably a pantropical species with wide
distribution.
Acrotritia sterigma (Niedbała, 1998)
(Fig. 3E)
Supplementary description
Measurements. Prodorsum: length 212, height 91; prodorsal setae: ss 51, in 91, le and ro 63, ex
10; notogaster: length 414, height 278; notogastral setae: c1 56, c1/c1-d1=0.5.
Remarks
Specimen from Borneo is much smaller than those from Society Islands (Niedbała 1998).
Plonaphacarus kugohi (Aoki, 1959)
(Fig. 3FH)
Supplementary description
Measurements. Prodorsum: length 228, height 76; notogaster: length 379, height 232.
455
2020 NIEDBAŁA & ERMILOV: PTYCTIMOUS MITES FROM THE ORIENTAL REGION
Remarks
Specimens from Malaysia differs from the type specimen (Aoki 1959) by the some small
characters: sensilli seen from lateral side are distinctly rounded distally (versus rather slightly
pointed distally); adanal setae ad2 straight distally (while usually in this species setae ad2 are bent
distally); different arrangement of setae on femora I, lateral setae l located anterior of the ventral
setae v (versus slightly posterior of ventral setae).
FIGURE 4AH. A–E. Acrotritia paraardua Niedbała & Starý, 2014: Aprodorsum, lateral view; B
prodorsum, dorsal view; Copisthosoma, lateral view; Dmentum of subcapitulum; Eright side of ventral
plates. FH. Acrotritia ardua (C.L. Koch 1841): F—prodorsum with anterior part of notogaster, lateral view;
Gprodorsum, dorsal view; Hleft genitoaggenital plate. Scale bars 100 µm (C), 50 µm (A, B, DH).
456 SYSTEMATIC & APPLIED ACAROLOGY VOL. 25
Plonaphacarus protrusus Liu, Wu & Chen, 2011
(Fig. 5AJ)
Supplementary description
Measurements. Specimen I: prodorsum: length 323, height 106; prodorsal setae: ss 88, in 164,
le and ro 51, ex 40; notogaster: length 636, width 404, height 373; notogastral setae: c1 190, c1/c1-d1
1.25, cp 78, h1 and ps1 167, h2 81, h3 30; genitoaggenital plate 142 × 106; anoadanal plate 185 × 121.
Specimen II: prodorsum: length 303, width 202, height 116; notogaster: length 586, width 384,
height 333. Specimen III: prodorsum: length 353, height 131; not o g a s t e r : l e n g t h 7 4 7 , h e i g h t 4 3 4 .
Species of medium size.
Integument. Colour brown. Surface of body covered with large concavities.
Prodorsum. Protruding median crista present. Lateral carinae absent. Sigillar fields narrow,
poorly visible. Posterior furrows indistinct. Sensilli long, narrow, slightly fusiform in distal half,
covered with small spines. Rostral setae procumbent, thick, barbed. Lamellar setae relatively long,
thinner but also barbed. Interlamellar setae thick, long, semierect covered with small spines along
whole length. Exobothridial setae rather long, as long as diameter of bothridia.Comparative lengths
of setae: in>ss>ro=le>ex.
Ventral region. Setae h of subcapitular mentum considerably longer than distance between
them. Genital plates with nine setae after formula: 7(4+3): 2; setae g1-g5 minute, smaller than setae
g6-g9, g1, g2 thin, g3-g9 thicker. Anoadanal plates with kind of elongated lateral bulging, five pairs of
rough setae present, adanal setae ad2 and ad2 longest and thickest, anal setae longer than ad3.
Legs. Chaetome of legs of complete type, setae d on femora slightly remote from distal ends of
articles.
Remarks
Four specimens from Taiwan are almost identical with types from nearby Chinese Province
Fujian (Liu et al. 2011). Some small differences: rostral setae thick, barbed (versus rostral setae thin,
smooth); setae cp smaller than dorsal setae (versus setae cp similar in length to dorsal setae); setae
g1, g2 thin, setae g3-g9 thicker (versus all genital setae thin, minute); anoadanal plates with kind of
elongated lateral bulging (versus these bulging not exist).
This species is easily distinguishable by the presence of anterodorsal cowl of notogaster and
thick interlamellar and notogastral setae covered with small spines along whole length, heterotrichy
of notogastral setae and presence of kind of elongated lateral bulging on anoadanal plates.
Conclusion
We have found 33 species from 15 genera and six families of ptyctimous mites from the Oriental
region; of these, two species (Euphthiracarus (Pocsia) insperatus Niedbała sp. nov. from Indonesia
and Hoplophthiracarus paraconcinuus Niedbała sp. nov. from Malaysia) are new for science. Nine
species (Mesoplophora (Parplophora) flavida and Indotritia (Indotritia) krakatauensis from Sri
Lanka; Austrotritia robusta, Sabahtritia sarawak and Phthiracarus pygmaeus from Indonesia;
Microtritia minima, Atropacarus (Atropacarus) striculus, Plonaphacarus foveolatus and
Plonaphacarus protrusus from Taiwan) are recorded for the first time in fauna of these countries or
regions. Two species (Acrotritia mahunkai, Acrotritia paraardua) are recorded for the first time in
the Oriental region.
457
2020 NIEDBAŁA & ERMILOV: PTYCTIMOUS MITES FROM THE ORIENTAL REGION
FIGURE 5AJ. Plonaphacarus protrusus Liu, Wu & Chen, 2011. A—prodorsum, lateral view; B—
prodorsum, dorsal view; C—opisthosoma, lateral view; D—mentum of subcapitulum; E—left genitoaggenital
plate; F—seta g9; G—left anoadanal plate; H—trochanter and femur of leg I; I—tibia of leg IV; J—prodorsum,
dorsolateral view, another specimen. Scale bars 100 µm (A-C, J), 50 µm (D, E, G), 25 µm (H, I), 10 µm (F).
458 SYSTEMATIC & APPLIED ACAROLOGY VOL. 25
Acknowledgements
We cordially thank G. Gabryś, E. Jendek, O. Joharchi, A.A. Khaustov, B. Klarner, C.M. Leong, J.R.
Liao, H.C. Lee, O. Šauša, D. Sandmann and M. Szkudlarek for providing ptyctimous mites for our
study; and Maka Muvanidze (Agricultural University of Georgia, Institute of Entomology, Tbilisi,
Georgia) and two anonymous reviewers for valuable comments.
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Submitted: 29 Dec. 2019; accepted by Maka Murvanidze: 28 Jan. 2020; published: 18 Mar. 2020
... The ptyctimous mite (Acari, Oribatida) fauna of Taiwan are insufficiently studied; at present, only 13 species are known (e.g. Niedbała & Liu 2018;Niedbała & Ermilov 2018, 2020. ...
... Specimens from Taiwan determined as A. paraardua Niedbała & Starý, 2015 in paper of Niedbała & Ermilov (2020) in fact are A. hauseri. In our opinion, the whole group of species similar to A. ardua, differing mainly in the characteristic shape of the sensilli, with head covered distally with dense small spines, requires verification and revision. ...
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Oribatids from the eastern part of the Ethiopian region. II
  • S Mahunka
Mahunka, S. (1983) Oribatids from the eastern part of the Ethiopian region. II. Acta Zoologica Academiae Scientiarum Hungaricae, 29(1-3), 151-180.
Trois Phthiracaridae (Acari, Oribatida) originaires du Nepal. Folia Entomologica Hungarica
  • W Niedbała
Niedbała, W. (1982) Trois Phthiracaridae (Acari, Oribatida) originaires du Nepal. Folia Entomologica Hungarica, 43(1), 95-109.
Changement du système et redescription d'espècestypes
  • W Niedbała
Niedbała, W. (1984) Mesoplophoridea (Acari, Oribatida). Changement du système et redescription d'espècestypes. Bulletin of the Polish Academy of Sciences, Biological Sciences, 32(3-4), 137-155.