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Supplement to the revision of the tribe Gyaritini Breuning, 1956
with the description of three new species
(Coleoptera, Cerambycidae)
Francesco Vitali
7a, rue Jean–Pierre Huberty
1742 Luxembourg, Luxembourg
and
Xavier Gouverneur
3, rue de la Santé
35000 Rennes, France
___________________
Abstract
Yimnashana (s. str.) befui n. sp. from Pahang, Malaysia, Yimnashana (s. str.) bezarki n. sp.
from Vietnam and Pseudoloessa malayana n. sp. from Pahang, Malaysia, are described.
Key-words
Cerambycidae, Lamiinae, Gyaritini, new species, Southeast Asia.
Résumé
Yimnashana (s. str.) befui n. sp. de Pahang, Malaisie, Yimnashana (s. str.) bezarki n. sp. du
Vietnam et Pseudoloessa malayana n. sp. de Pahang, Malaisie, sont décrites.
Mots-clés
Cerambycidae, Lamiinae, Gyaritini, nouvelles espèces, Asie du sud-est.
___________________
Introduction
The tribe Gyaritini was defined by Breuning (1956) for those Lamiinae having the following
combination of characters: scape without cicatrix, mesocoxal cavities closed, mesotibiae grooved
and tarsi with divergent claws. The first revision of this group – unfortunately, with numerous
systematic and structural errors – included 43 species distributed in 13 genera (Breuning,
1979). After the transfer of a species of Guyana to Apomecynini (Monné & Giesbert, 1994)
and the revisions that we have undertaken (Gouverneur & Vitali, 2016a, 2016b), Gyaritini are
a strictly Asiatic tribe, which currently includes 12 genera and 38 species.
The interest in the topic has led some of our colleagues to submit further material, inclu-
ding three new species, which are described in this note.
Les Cahiers Magellanes, No28 décembre 2017 — 29
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Materials and methods
Species belonging to the following collections have been examined:
CSB: Shinichi Befu private collection, Kochi (Japan)
CAS: California Academy of Sciences, San Francisco (USA)
Results
Yimnashana (s. str.) befui n. sp. (Fig. 1)
Typical material. – Holotype
♂
, Malaysia, Pahang, Tanah Rata, Gunung Jasar 1700 m, 10-
V-2008, S. Befu lgt., in SBC. Paratypes: 3
♂♂
, 22-III-2012, same data.
Diagnosis. – Minute, dark brown, labium, palpi, antennae (except for the scape), elytra, legs
(except for the femoral clubs) and ventral side reddish brown, covered with long black setae;
elytra regularly striated, covered with recumbent golden pubescence except for a median trans-
verse band and a pre-apical spot.
Description. – Male; body length 4.0–4.1 mm.
Head as broad as the pronotum, covered with dense coarse punctation, and numerous erect
black setae; labium smooth; last maxillary palpomere long, securiform; interantennal space
wide; antennal tubercles scarcely raised, separated by an indistinct median furrow; eyes coar-
sely facetted, reniform; lower eyes-lobes a little shorter than genae.
Antennae extending beyond the elytra with the last three segments, fringed with long rai-
sed setae on the inner side and some shorter ones on the outer side, at the apex of each seg-
ment; scape strong and oval, dorsally convex; pedicel one-fourth as long as scape; antennomere
III and IV equal, one-fifth longer than scape; antennomeres VI-X subequal, one-third shorter
than III or IV, antennomere XI a bit shorter. Antennomere proportions according to the for-
mula: 1.2: 0.3: 1.5: 1.5: 1.0: 1.0: 1.0: 1.0: 1.0: 1.0: 0.9.
Pronotum subcylindrical, one-tenth longer than broad, armed with a minute tooth at the
middle of each side and with two strong discal hooked teeth, curved backwards, apically acute,
and whose base is placed in the axis of the edge of the upper eyes-lobes; basal margin slightly
sinuate and slightly narrower than the apical margin, which is rounded and fringed with long,
evenly spaced bristles; disc covered with dense coarse punctures and very long raised setae.
Scutellum black, small, as long as wide, regularly rounded apically, covered with a short gol-
den pubescence.
Elytra 1.6 times as long as broad, obovate, slightly wider than pronotum at base, separately
rounded at apex; base with two dark brown conical teeth, as long as those of the pronotum, whose
front side is oblique and the posterior one is perpendicular to the elytral disc; shoulders with
slightly rounded corners; sides concavely widened to the middle, then convexly rounded to the
apex; disc with regular striae of impressed punctures, some with very long raised black bristles,
and a recumbent short golden pubescence, which does not cover the basal teeth, a posteriorly
convex median transverse band, a large apical spot and some small irregular discal spots. Hind
wings atrophic, acutely restricted at apex, posteriorly reaching the half of the elytral length.
Les Cahiers Magellanes, No28 décembre 2017 — 30
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Legs covered with long raised bristles; femora slightly club-shaped; tibiae linear, without
lateral fissure; tarsi comparatively long; claws divergent; metatarsi three-fourth as long as meta-
tibiae, metatarsomere I about as long as tarsomeres II and III together or as the onychium.
Ventral side, covered with indistinct recumbent pubescence and extremely fine dense punc-
tures, procoxal cavities posteriorly closed; mesocoxal cavities laterally open; visible urosternite
V rounded at the apex.
Etymology. – This species is dedicated to Shinichi Befu, enthusiastic entomologist and col-
lector of the typical series.
Remarks. – Pronotum with discal teeth, base of elytra with discal teeth, scape without spine,
short metasternum, elytra constricted at base, atrophic hind wings and entire eyes allow classi-
fying this species in the genus Yimnashana (s. str.) Gressitt, 1937. The new species is well cha-
racterised by its obovate striated elytra.
Yimnashana (s. str.) bezarki n. sp. (Fig. 2)
Typical material. – Holotype
♂
, Vietnam, Khanh Hoa, Hon Ba nature reserve, 12.120°N
108.948°E, 1500 m, 13/16-VI-2015, Bezark, Bicha, Mudge & Schiff collectors, in CAS.
Diagnosis. – Minute, black; trochanters and extreme base of femora reddish brown; covered
with long black setae; elytra regularly striate, covered with recumbent grey pubescence except
for a wide pre-median transverse band and a narrow pre-apical band.
Description. – Male; body length 4.8 mm.
Head as broad as the pronotum, covered with dense coarse punctation, and numerous erect
black setae; labium smooth; last maxillary palpomere long, securiform; interantennal space
wide; antennal tubercles scarcely raised, separated by a fine median furrow; eyes coarsely facet-
ted, strongly reniform (under and upper lobes linked by a row of ommatidia); lower eyes-lobes
one-half as long as genae.
Antennae extending beyond the elytra with the last two segments, fringed with long raised
setae at the apex of each segment and on the inner side and some shorter ones on the outer
side; scape relatively elongate and oval, dorsally convex; pedicel elongate, twice as long as wide,
one-fourth as long as scape; antennomere III almost as long as scape, antennomeres III-VIII
progressively shortened; antennomeres VIII-IX equal. Antennomere proportions according to
the formula: 1.9: 0.5: 1.8: 1.6: 1.3: 1.2: 1.1: 1.0: 1.0: 1.0: 1.0.
Pronotum heart-shaped, as long as wide, armed at the basal third of each side, with a
minute acute spine and two strong discal straight teeth, whose apex is obliquely cut like a cram-
pon, and whose base is placed in the axis of the edge of the upper eyes-lobes; basal margin
straight and one-fifth narrower than the apical margin, which is feebly convex; disc covered
with very long raised setae and dense coarse punctures, stronger but less dense than those cove-
ring the head.
Scutellum black, small, transverse, regularly rounded apically, covered with a short silver
pubescence.
Les Cahiers Magellanes, No28 décembre 2017 — 31
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Elytra 1.5 times as long as broad, elliptical, slightly wider than pronotum at base, rounded
at apex; base with two dark brown bowed teeth, reaching the same level of the pronotal ones,
each armed with a small spine on the anterior margin of the base; humeri with slightly roun-
ded corners; sides concavely widened to the middle, then convexly rounded to the apex; disc
with regular striae of impressed punctures, five rows of long raised black bristles and recum-
bent short golden pubescence, which does not cover the basal teeth and two transversal bands.
Hind wings atrophic.
Legs covered with long raised white bristles; femora slightly club-shaped; tibiae linear, without
lateral fissure; tarsi comparatively long; claws divergent; metatarsi three-fourth as long as metati-
biae, metatarsomere I about as long as tarsomeres II and III together or as the onychium.
Ventral side finely wrinkled and covered with fine recumbent pubescence, procoxal cavities
posteriorly closed; mesocoxal cavities laterally open; visible urosternite V feebly rounded and
fringed by dense reddish setae at the apex.
Etymology. – This species is dedicated to our colleague Larry G. Bezark, enthusiast longicor-
nist and creator of the website "A photographic catalog of the Cerambycidae of the World."
Remarks. – This species shows the typical features of the genus Yimnashana (s. str.) and
seems closely related to Yimnashana (s. str.) befui n. sp. due to the rounded, regularly striated
elytra. The peculiar characters of this species are the elytral teeth, extremely long and armed
with an additional basal spine. Together with the previously described Y. befui n. sp., this spe-
cies might constitute a further section of Yimnashana showing the same wing adaptations to
the altitude as the subgenus Tinkhamia Gressitt, 1937 but still showing entire eyes (archaic cha-
racter). This group might be considered as intermediate between Yimnashana and Tinkhamia.
Following another interpretation, Yimnashana (s. str.) should include only species characteri-
sed by brachyptery, entire eyes and parallel-sided elytra. This taxon seems to be more basal and
different from Gyaritus only in the reduced hind wings. In contrast, Tinkhamia should include
species characterised by brachyptery and ovoid elytra. Accordingly, befui n. sp. and bezarki n. sp.
should be classified as Tinkhamia, forming an archaic subgenus of Tinkhamia characterised by
entire eyes (divided in two lobes in Tinkhamia s. str.). Moreover, Y. bezarki n. sp. shows a peculiar
double basal spine that might be considered either as a specific character or a peculiar feature defi-
ning another section, maybe a new subgenus. Whether Yimnashana is a subgenus of Gyaritus and
Tinkhamia an independent genus (with befui n. sp. and bezarki n. sp. placed in one or two new
subgenera of Tinkhamia) or all brachypterous species should be considered as a unique genus
(i.e. Yimnashana, divided in several subgenera), the answer remains inconclusive. New elements
should be considered in order to understand the true phylogeny of these taxa.
Pseudoloessa malayana n. sp. (Fig. 3)
Typical material. – Holotype
♂
, Malaysia, Pahang, Tanah Rata, Gunung Jasar 1700 m, 9-
VIII-2012, S. Befu lgt., in SBC. Paratypes: 2
♂♂
, 2
♀♀
, same data.
Diagnosis. – Minute, pitch-brown; labium, tibiae and base of the antennomeres reddish; ely-
tra covered with a recumbent yellowish pubescence and with two transverse black bands (a basal
one and a large post-median one), both decorated with an apically directed zigzag white line.
Les Cahiers Magellanes, No28 décembre 2017 — 32
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Les Cahiers Magellanes, No28 décembre 2017 — 33
Description. – Body length 3.2–3.6 mm.
Head as broad as the pronotum, covered with some erect black setae; labium smooth; fore-
head shiny, covered with sparse punctation, last maxillary palpomere pointed at apex; vertex
appearing dull, covered with dense fine punctation, interantennal space wide; antennal tuber-
cles flat, separated by an indistinct median furrow; eyes coarsely facetted, reniform; lower eyes-
lobes evidently shorter than genae.
Antennae extending beyond the elytra with the last three (male) or two (female) segments,
fringed with long raised setae on the inner side and some shorter ones on the outer side at the
apex of each segment; scape oval, fairly long and gently bowed, dorsally convex; pedicel elon-
gate, about one-fourth as long as scape, antennomere III 0.7 times as long as scape; antenno-
mere IV evidently longer than III; antennomere V nearly as long as III; following antennomeres
progressively shorter; antennomere XI as long as (male) or hardly shorter (female) than X.
Antennomere proportions according to the formula: 1.04: 0.28: 0.72: 0.85: 0.75: 0.65: 0.60 :
0.55: 0.48: 0.45: 0.45.
Pronotum cylindrical (male) or feebly constricted posteriorly (female), transverse, one-
tenth wider than long, unarmed at sides; basal margin slightly convex posteriorly as wide
(male) or evidently narrower (female) than the apical margin; disc covered with dense coarse
punctures and some sparse long raised setae.
Scutellum transverse, densely covered with whitish pubescence.
Elytra 1.8 times as long as broad, much wider than pronotum at base, parallel-sided, feebly
inflated at the apical third, largely rounded at apex; base with two hairless obtuse conical teeth
whose apex is feebly directed backwards; humeri with slightly rounded corners; disc covered with
irregular punctures, coarser but sparser than those covering the pronotum, some long raised black
bristles and recumbent short pubescence forming the following pattern: 1) a transverse black
band on the basal fifth; 2) a large transverse yellowish pre-median band; 3) a large transverse
black post-median band, as high as the pre-median one; 4) an apical yellowish bands on the api-
cal fourth; moreover, an apically directed zigzag narrow white line covers both black bands.
Legs covered with white recumbent pubescence and some raised bristles; femora club-sha-
ped; tibiae feebly sinuate, without lateral fissure; claws divergent; metatarsi fourth-fifths as long
as metatibiae, metatarsomere I shorter than tarsomeres II and III together or as the onychium.
Ventral side covered with extremely fine dense punctures and sparse recumbent white
pubescence at the sides and along the margin of each urosternite; procoxal cavities posteriorly
closed; mesocoxal cavities laterally open; visible urosternite V rounded at the apex.
Etymology. – Malayan, i.e. inhabitant of Malaysia, with allusion to the typical locality.
Remarks. – The pronotum without discal teeth and base of elytra with discal teeth allow
classifying this species in the genus Pseudoloessa Gouverneur & Vitali, 2016. The new species
is closely related to the Bornean Pseudoloessa bispinosa (Breuning, 1960), type-species of the
genus and known only for the holotype (Breuning, 1979), which differs in the pronotum
strongly constricted posteriorly, the narrow post-median black band (one-half as high as the
pre-median light band) and the greyish (rather than yellowish) elytral pubescence. Moreover,
it differs from the Indonesian Pseudoloessa javanica (Breuning, 1963) in the smaller lower
eyes-lobes (as long as genae in P. javanica) and the different elytral pattern (with a black spot
behind shoulders and a narrow zigzag black band after the middle in P. javanica). Pseudoloessa
malayana n. sp. expands the distribution of the genus, which was limited to Vietnam, Borneo
and Java (Gouverneur & Vitali, 2016a).
CM 28_Mise en page 1 05/12/17 10:35 Page37
Les Cahiers Magellanes, No28 décembre 2017 — 34
1. Yimnashana (s. str.) befui n. sp., Holoty pe. 2. Yimnashana (s. str.) bezarki n. sp., Holotype, a: dorsal view; b: lateral
view. 3. Pseudoloessa malayana n. sp., Holoty pe.
3
2b
2a
1
CM 28_Mise en page 1 05/12/17 10:35 Page38
Acknowledgments
The authors thank Shinichi Befu, Kochi (Japan) and Larry G. Bezark, Sacramento (USA)
for having provided us their interesting material and the linguistic revision of the text.
Bibliography
Breuning (S.), 1956. – Die Ostasien-Cerambyciden im Museum A. Koenig, Bonn. Bonner
Zoologische Beiträge, 7(1–3): 229–236.
Breuning (S.), 1979. – Révision de la tribu des Gyaritini Breun. (Coleoptera Cerambycidae).
Edition Sciences Nat: 1–20.
Gouverneur (X.) & Vitali (F.), 2016a. – Révision de la tribu des Gyaritini Breuning, 1956
et descriptions de nouvelles espèces du Laos (Coleoptera, Cerambycidae). Les Cahiers Magel-
lanes, NS, 21: 103–124.
Gouverneur (X.) & Vitali (F.), 2016b. – Compléments à la révision de la tribu des Gya-
ritini Breuning, 1956 et description d’un nouveau genre et d’une nouvelle espèce laotienne
(Coleoptera, Cerambycidae). Les Cahiers Magellanes, NS, 23: 40–47.
Monné (M. Á.) & Giesbert (E. F.), 1994. – Checklist of the Cerambycidae and Disteniidae
(Coleoptera) of the Western Hemisphere. Wolfsgarden Books, Burbank, I–XIV + 1–410.
Les Cahiers Magellanes, No28 décembre 2017 — 35
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