ArticlePDF Available

A new species of the genus Dexipeus Pascoe, 1885 (Coleoptera, Curculionidae) from the Philippines

Authors:

Abstract

A new species, Dexipeus krasilnikovi sp. nov. from Luzon (Philippines) is described and illustrated. This new species is very similar to D. uenoi Morimoto, 1978 but differs in the less coarsely punctate pronotum, with the apical constriction, without middle carina, and the rostrum distinctly longer than the pronotum. A key and distribution map for species of the genus Dexipeus are given. It is the first record of the genus Dexipeus from the Philippines.
175
Baltic J. Coleopterol. 21(2) 2021
ISSN 1407 - 8619
INTRODUCTION
The tribe Strombocerini is presented by 46 de-
scribed species from 12 genera from the Oriental
Region (Alonso-Zarazaga et al., 2017;
Grebennikov, 2018a, 2018b, 2018c; Legalov, 2019,
2020b, 2021a, 2021b). The genus Dexipeus
Pascoe, 1885 differs from other genera in the lin-
ear eyes narrowly separated ventrally, 6-seg-
mented funicle and obliquely truncate antennal
club (Morimoto, 1978). This genus includes three
described species, D. fumosus Pascoe, 1885 from
Java and D. costatus from Sumatra, Indonesia
(Pascoe, 1885), and D. uenoi Morimoto, 1978 is
from Okinawa, Japan (Morimoto, 1978) and the
new species from the Philippines.
A new species of the genus Dexipeus Pascoe, 1885 (Coleoptera,
Curculionidae) from the Philippines
Andrei A. Legalov
Legalov A.A. 2021. A new species of the genus Dexipeus Pascoe, 1885 (Coleoptera,
Curculionidae) from the Philippines. Baltic J. Coleopterol. 21(2): 175 - 180.
A new species, Dexipeus krasilnikovi sp. nov. from Luzon (Philippines) is described and
illustrated. This new species is very similar to D. uenoi Morimoto, 1978 but differs in the less
coarsely punctate pronotum, with the apical constriction, without middle carina, and the rostrum
distinctly longer than the pronotum. A key and distribution map for species of the genus
Dexipeus are given. It is the first record of the genus Dexipeus from the Philippines.
Key words: Curculionoidea, Dryopththorinae, Strombocerini, Luzon.
Andrei A. Legalov. Institute of Systematics and Ecology of Animals, Siberian Branch, Russian
Academy of Sciences, Frunze street-11, Novosibirsk 630091 Russia; e-mail:
fossilweevils@gmail.com
Altai State University, Lenina-61, Barnaul 656049 Russia.
Tomsk State University, Lenina Prospekt, 36, Tomsk 634050 Russia.
In this paper, the new species of the genus
Dexipeus from Luzon is described.
MATERIAL AND METHODS
Type specimen is kept in the ISEA = Institute of
Systematics and Ecology of Animals (Russia:
Novosibirsk). Descriptions, body measurements,
and photographs, were prepared using the Zeiss
Stemi 2000-C dissecting stereomicroscope. The
terminology of the weevil body structure is ac-
cording to Lawrence et al. (2010). The systemat-
ics of studied taxa are based on the works of
Grebennikov (2018a) and Legalov (2020a).
176
Legalov A.A.
RESULTS
Genus Dexipeus Pascoe, 1885
Dexipeus krasilnikovi sp. nov.
(Fig. 1)
Type material: Holotype. Male (ISEA), North
Luzon, Ifugao, Banaue, X.2016.
Paratypes. Female (ISEA), idem, IV.2016; male
(ISEA), North Luzon, Ifugao, Hungduan, III.2018;
female (ISEA), North Luzon, Mt. Province,
Bontoc, I.2014; male (ISEA), idem, IX.2014; fe-
male (ISEA), idem, I.2015; female (ISEA), idem,
I.2018; female (ISEA), idem, II.2018.
Description. Male. Body black, with matted pu-
bescence. Antennae, apex of tibiae and tarsi red-
brown. Head subconical. Mandibles small. Ros-
trum long, weakly longer than pronotum, about
4.0 times as long as wide at apex and at midlength,
about 3.6 times as long as wide at base, distinctly
curved, densely punctate. Apex of rostrum finely
punctate. Eyes large, linear, not protruding from
contour of head, narrowly separated ventrally.
Forehead flat, about 0.5 times as long as rostrum
base width. Antennal scrobes directed ventrally
to base of rostrum. Antennae inserted near mid-
dle of rostrum. Scape long, 4.6 times as long as
wide in apex, not reaching eye. Funicle 6-seg-
mented. Antennomeres 2 and 3 subconical.
Antennomere 2 about 1.7 times as long as wide
in apex, 0.3 times as long as scape. Antennomere
3 0.9 times as long as wide in apex, 0.5 times as
long as and slightly narrower than antennomere
2. Antennomeres 4-7 wide-conical. Antennomere
4 0.5 times as long as wide in apex, 0.6 times as
long as and 1.1 times as wide as antennomere 3.
Antennomere 5 0.4 times as long as wide, 0.8
times as wide as and slightly wider than
antennomere 4. Antennomere 6 0.3 times as long
as wide, 0.8 times as long as and slightly wider
than antennomere 5. Antennomere 7 0.3 times as
long as wide, equal in length and 1.1 times 1.2
times as wide as antennomere 6. Antennal club
compact, obliquely truncate, about 1.7 times as
long as wide, about 0.8 times as long as
antennomeres 2-7 combined, with tomentose
apex. Pronotum campanulate, with apical con-
striction, 1.5 times as long as wide at apex, about
1.1 times as long as wide at midlength, about 1.2
times as long at pronotal base. Pronotal disk
weakly convex dorsally, coarsely punctate, with-
out carina in middle. Intervals between points
smaller than their diameter. Sides weakly nar-
rowed from apical third towards base. Maximum
width in middle. Base of pronotum slightly nar-
rower than base of elytra. Scutellum small, trian-
gular. Elytra almost subparallel, at base 2.0 times
as long as wide, at midlength about 1.4 times as
long as wide, at apical fourth 2.1-2.2 times as long
as wide, 1.9-2.0 times as long as pronotum. Hu-
meri weakly flattened. Elytral striae distinct, with
large punctation. Stria 9 short, fused with stria 10
at level of metacoxae. Interstriae convex, narrow,
0.5-0.8 times as narrow as striae, pilose. Odd
interstriae with fully matted pubescence.
Prosternum punctate, with weak rostral channel,
without postocular lobes. Precoxal portion of
prosternum slightly longer than procoxal cavity.
Postcoxal portion of prosternum short. Procoxal
cavities contiguous. Mesocoxal cavities narrowly
separated. Metanepisternum absent.
Metaventrite about 2.5 times as long as length of
metacoxa, flattened, punctate. Abdomen weakly
convex ventrally, punctate. Ventrite 1 1.5 times
as long as length of metacoxa. Ventrite 2 about
0.8 times as long as ventrite 1. Ventrite 3 0.5 times
as long as ventrite 2. Ventrite 4 shorter than
ventrite 3. Ventrite 5 about 1.2 times as long as
ventrite 4, densely punctate. Pygidium impressed
in middle. Procoxae subconical. Mesocoxae
spherical, narrowly separated. Metacoxae trans-
verse. Femora slightly thickened, without tooth.
Metafemora not extending beyond apex of ab-
domen. Tibiae weakly curved, with large uncus.
Tarsi long. Tarsomeres 1-3 conical, with erect
setae ventrally. Tarsomere 5 elongate. Tarsal
claws free, divergent. Total body length (with-
out rostrum) 3.4-3.8 mm. Length of rostrum 0.9-
1.0 mm.
Female. Rostrum 3.9-4.0 times as long as wide at
apex, 4.1-4.2 times as long as wide at midlength,
about 3.6 times as long as wide at base. Pronotum
1.2 times as long as wide at apex, about 0.9 times
177
A new species of the genus Dexipeus Pascoe, 1885 (Coleoptera, Curculionidae) from the Philippines
Fig. 1. Dexipeus krasilnikovi sp. nov.: a – holotype, male, habitus, dorsally, b – paratype, female,
habitus, dorsally, c – holotype, aedeagus and tegmen, dorsally, d – holotype, male, habitus, laterally,
e – paratype, female, habitus, laterally. Scale bar for a, b, d, e = 1.0 mm, for c = 0.5 mm.
178
Legalov A.A.
as long as wide at midlength and at pronotal base.
Elytra at base 1.8 times as long as wide, at
midlength about 1.6-1.7 times as long as wide, at
apical fourth about 2.2 times as long as wide,
about 2.7 times as long as pronotum. Andominal
ventrites 1 and 2 more convex. Total body length
(without rostrum) 3.7-4.1 mm. Length of rostrum
1.0-1.1 mm.
Diagnosis. This new species is similar to D. uenoi
from Okinawa but differs in the less coarsely
Fig. 2. Distribution of the genus Dexipeus: star – D. uenoi, rhombus – D. fumosus, octagon – D.
krasilnikovi sp. nov., square D. costatus.
punctate pronotum, with the apical constriction,
without middle carina, and the rostrum distinctly
longer than the pronotum.
Etymology. The species is named in honor of
Vladislav A. Krasilnikov (Mariinsky Posad, Rus-
sia).
Distribution. Philippines: Luzon (fig. 2).
179
A new species of the genus Dexipeus Pascoe, 1885 (Coleoptera, Curculionidae) from the Philippines
Key to species of the genus Dexipeus
1. Odd elytral interstriae with fully matted pubescence.............................................................................2
- Punctation on all elytral interstriae with white pubescence....................................................................3
2. Pronorum coarsely punctate, subcylindrical, with middle carina. Rostrum subequal to pronotum.
..............................................................................................................................................................D. uenoi
- Pronotum less coarsely punctute, with apical constriction, without middle carina. Rostrum dis-
tinctly longer than pronotum.....................................................................................D. krasilnikovi sp. nov.
3. Pronotum finely punctate, with subparallel sides.................................................................D. costatus
- Pronotum coarsely punctate, with weakly rounded sides........................................................D. fumosus
REFERENCES
Alonso-Zarazaga, M.A., Barrios, H.,
Borovec, R., Bouchard, P., Caldara, R.,
Colonnelli, E., Gültekin, L., Hlavá, P.,
Korotyaev, B., Lyal, C.H.C., Machado, A.,
Meregalli, M., Pierotti, H., Ren, L., Sánchez-
Ruiz, M., Sforzi, A., Silfverberg, H.,
Skuhrovec, J., Trýzna, M., Velázquez de
Castro, A.J., Yunakov, N.N. 2017.
Cooperative catalogue of Palaearctic
Coleoptera Curculionoidea. Monografías
electrónicas, 8, 1–729.
Grebennikov V.V. 2018a. Dryophthorinae
weevils (Coleoptera: Curculionidae) of the
forest floor in Southeast Asia: illustrated
overview of nominal Stromboscerini genera.
Zootaxa, 4418 (2): 121–135.
Grebennikov V.V. 2018b. Dryophthorinae weevils
(Coleoptera: Curculionidae) of the forest floor in
Southeast Asia: Three-marker analysis reveals
monophyly of Asian Stromboscerini and new
identity of rediscovered Tasactes. European
Journal of Entomology, 115: 437–444.
Grebennikov V.V. 2018c. Dryophthorinae weevils
(Coleoptera: Curculionidae) of the forest floor in
Southeast Asia: DNA analysis of two new
Nephius from Vietnam and Taiwan suggests
nonmonophyly of Stromboscerini. Zootaxa,
4500 (3): 381–387.
Lawrence J.F., Beutel R.G., Leschen R.A.B.,
Slipinsky S.A. 2010. Chapter 2. Glossary of Mor-
phological Terms. Handbook of Zoology. Arthro-
poda: Insecta. Tb. 40: Coleoptera (Beetles). Vol.
2: Morphology and Systematics (Elateroidea,
Bostrichformia, Cucujiformia partim): 9–20.
Legalov A.A. 2019. A new species of the genus
Dryophthoroides Roelofs, 1879 (Coleoptera:
Curculionidae) from Philippines. Far Eastern En-
tomologist, 375: 20–24.
Legalov A.A. 2020a. Annotated key to weevils
of the world. Part 4. Subfamilies Erirhininae,
Dryophthorinae and Cossoninae
(Curculionidae). Ukrainian Journal of Ecology,
10 (2): 319–331.
Legalov A.A. 2020b. A new species of the genus
Nephius Pascoe, 1885 (Coleoptera,
Curculionidae) from Philippines. Baltic Journal
of Coleopterology, 20 (1): 15–18.
180
Legalov A.A.
Legalov A.A. 2021a. A new species of the genus
Tasactes Faust, 1894 (Coleoptera, Curculionidae)
from Nepal. Ecologica Montenegrina, 40: 128–
132.
Legalov A.A. 2021b. A new species of the genus
Allaeotes Pascoe, 1885 (Coleoptera,
Curculionidae) from Philippines. Baltic Journal
of Coleopterology, 21 (1).
Morimoto K. 1978. Check-list of the family
Rhynchophoridae (Coleoptera) of Japan, with de-
scriptions of a new genus and five new species.
Esakia, 12: 103–118.
Pascoe F.P. 1885. List of the Curculionidae of the
Malay Archipelago collected by Dr. Odoardo
Beccari, L. M. D’Albertis, and others. Annali del
Museo Civico di Storia Naturale di Genova, Se-
ries 2, 2 [22]: 201–332, pls. 1–3.
Received: 12.10.2021
Accepted: 21.12.2021
Published: 30.12.2021
... A strong group of beetle researchers has been established at the University of Mindanao (Davao, Philippines), whose scientists describe 2020; Cabras 2020; Medina et al. 2020;Medina, Cabras 2019 etc.). Many articles on new beetle species from the Philippines are also published by other world scientists (Anichtchenko, Medina 2019;Bramanti et al. 2020;Bukejs 2019;Hava, 2018;Leitāne, Rukmane-Bārbale 2020;Leitāne, Rukmane 2019;Legalov 2020; Rukmane-Bārbale 2020; Rukmane-Bārbale et al., 2020;Rukmane 2019aRukmane , 2019bRukmane , 2019c). Among the highly diverse groups of beetles found in the country one of the most intensively and actively studied in the recent years is Cerambycidae and a many new species in this family coming from the Philippines are described every year (Barševskis, Barševskis 2020; Barševskis 2020; Barševskis, Saulīte 2020;Vives 2013Vives , 2014Vives , 2015aVives , 2015bVives , 2020aVives , 2020bVives , 2021. ...
Article
Full-text available
This article includes new data on the distribution of Erythrus philipinus Vives, 2021, Xystrocera danilevskii Vives, 2013, and Xystrocera festiva Thomson, 1860 in the Philippines, as well as first description of the previously unknown female Erythrus philipinus and male Xystrocera danilevskii. The information in the article substantially complements the knowledge about these incompletely known species.
... The study of the tribe Strombocerini of the Philippines fauna began recently. Three species from the genera Allaeotes Pascoe, 1885, Dryophthoroides Roelofs, 1879 and Nephius Pascoe, 1885 were described (Legalov, 2019(Legalov, , 2020b(Legalov, , 2021. The genus Synommatus Wollaston, 1873 differs from other genera in the linear eyes contiguous ventrally, 5-segmented funicle, obliquely truncate antennal club and the prosternum without the postocular lobes (Morimoto, 1978). ...
Article
Synommatus leleji sp. n. is described and illustrated from the Philippines (Mindanao Island). The new species differs from other species of the genus in the suboval elytra with rounded sides, rugose-punctate pronotum, and the rostrum subequal to pronotum length. A key and distribution map for species of the genus Synommatus are given. It is the first record of the genus Synommatus from the Philippines.
Article
Full-text available
Four new species of the genera Dryophthoroides Roelofs, 1879 and Nephius Pascoe, 1885 from the tribe Stromboscerini of the subfamily Dryophthorinae are described and illustrated. Dryophthoroides telnovi Legalov, sp. nov. from New Guinea (Star Mountains) is similar to D. seftoni (Zimmermann, 1944) bit differs in the shorter and thicker rostrum and narrower pronotum. It is distinguish from D. beccarii (Pascoe, 1885) in the smaller body size, thicker rostrum, coarser punctured pronotum, not subparallel elytra and narrower elytral interstriae. Dryophthoroides insularis Legalov, sp. nov. from North Moluccas (Bacan Islands) differs from D. telnovi Legalov, sp. nov. in the wider, laterally weakly rounded pronotum with a more finely punctured pronotal disc, the stronger widened interstria five at apex, the smaller punctures in elytral striae, the wider elytral interstriae and the longer and thinner rostrum. Nephius continentalis Legalov, sp. nov. from Laos (Hua Phan Prov.) differs from N. kalimantanensis Legalov, 2022 in the thicker and shorter rostrum, the pronotum lacking the sharp preapical constriction, the elytra with the greatest width postmedium, the medially not depressed lateral sides of the pronotum, and the obsolete humeri. Nephius philippinensis Legalov, sp. nov. from the Philippines (Mindanao Is., Bukidnon Prov.) differs from N. mindanaoensis Legalov, 2020 in the sparsely punctate pronotum with a median longitudinal groove and lacking four premedian pilose ridges, the elytral interstriae with weak pilose ridges, and the less curved rostrum.
Article
Full-text available
A new species, Tasactes dudkoi Legalov, sp. nov. from Eastern Nepal is described and illustrated. This new species is similar to Th. interruptus Faust, 1894 from Myanmar but differs from it in the more strongly curved rostrum, punctate pronotum, with rounded sides narrowed more sharply towards base. A key to species of the genus Tasactes is given.
Article
Full-text available
Dryophthoroides mindanaoensis Legalov, sp. n. is described and illustrated from Mindanao (Philippines). The new species is similar to D. sulcatus Roelofs, 1879 from Japan and China but differs in the prosternum with weak rostral channel, more obliquely truncated antennal club, subparallel elytra, more large body sizes and form of the apex of the aedeagus. Distribution map for species of the genus Dryophthoroides is given also.
Article
Full-text available
A new species Asiodonus sikhotealinensis sp. nov. from Khabarovskii krai (North-Eastern part of the Sikhote-Alin Mountain Range) is described and illustrated. This new species is similar to A. streltzovi Legalov, 2012 but differs in the narrower elytra, the greatest width of pronotum before apex and narrower and longer aedeagus. A distribution map for the species of the Asiodonus rugulosus-group is given. © 2018, Baltic Institute of Coleopterology. All rights reserved.
Article
Full-text available
The nominal genus Tasactes Faust, 1894, consisting of two originally included nominal species from Myanmar, is rediscovered for the fi rst time since being erected. Adult weevils herein assigned to the taxonomically re-defi ned Tasactes were abundant in forest fl oor litter at fi ve localities in China (Yunnan and Sichuan), plus one specimen is available from Shaanxi and three from Nepal. Phylogenetic analysis of a 2,275 bp matrix concatenated from one mitochondrial (COI) and two nuclear markers (ITS2 and 28S) revealed that the monophyletic Tasactes consists of eight evolutionary signifi cant terminal clades, either allopatric (three) or sympatric (two on Cang Shan in Yunnan and three on Mount Emei in Sichuan). The genus Tasactes is nested within the monophyletic Stromboscerini, while the tribe is sister to monophyletic Dryophthorus. The two morphological diagnostic characters of Tasactes, which are unique within the tribe, are the transversely truncated antennal club and conically projecting velvety apex of the club. So defi ned, Tasactes renders the genus Orthosinus paraphyletic. Considering the taxonomic neglect and uncertainties surrounding nominal Stromboscerini, all herein reported members of this tribe, including the Tasactes, are not assigned to Linnaean species. This paper illustrates the "clogging taxonomy" phenomenon, in which obscure historical names render taxonomic assignment of newly sampled specimens precarious. All the data used herein (localities, sequences, specimen images) are available online in public datasets dx.doi.org/10.5883/DS-TASACT1 and dx.doi.org/10.5883/DS-TASACT2. © Institute of Entomology, Biology Centre, Czech Academy of Sciences, České Budějovice.
Article
The weevil genus Nephius Pascoe is for the first time reported from Vietnam (N. argus sp. nov.) and Taiwan (N. acastus sp. nov.). Until now the genus was attributed to the tribe Stromboscerini and contained nine nominal species and two subspecies known only from the type series. Phylogenetic analysis of one mitochondrial (COI) and two nuclear (ITS2 and 28S) markers strongly rejected monophyly of the tribe by placing the monophyletic Nephius as sister to a clade consisting of reciprocally monophyletic Dryophthorus and the rest of Stromboscerini. All herein used data (localities, DNA sequences, specimen images) are available online in public datasets dx.doi.org/10.5883/DS-NEPHIUS1 and dx.doi.org/10.5883/DS-NEPHIUS2.
Article
Entomological Laboratory, Faculty of Agriculture, Kyushu University Check-list of the family Rhynchophoridae of Japan and key to the genera of the subfamily Dryophthorinae and that to the genera of the tribe Stromboscerini are given. New taxa, recombination and synonymies treated in this paper are as follows: Synommatoides shirozui gen. et sp. nov. Dexipeus uenoi sp. nov. Cryptoderma kuniyoskii sp. nov. Diocalandra sasa sp. nov. Diocalandra kamiyai sp. nov. Paracalendra Chujo et Morimoto, 1959 =Myocalandra Faust, 1894, syn. nov. Paracalendra saccharivova ChiijG et Morimoto, 1959 =Myocalandra exarata Boheman, 1838, syn. nov. Stenommatus ocularis Konishi, 1963, comb. nov. (Dryopktkorus)
Chapter 2. Glossary of Morphological Terms
  • J F Lawrence
  • R G Beutel
  • R A B Leschen
  • S A Slipinsky
Lawrence J.F., Beutel R.G., Leschen R.A.B., Slipinsky S.A. 2010. Chapter 2. Glossary of Morphological Terms. Handbook of Zoology. Arthropoda: Insecta. Tb. 40: Coleoptera (Beetles). Vol. 2: Morphology and Systematics (Elateroidea, Bostrichformia, Cucujiformia partim): 9-20.
Dryophthorinae and Cossoninae (Curculionidae)
  • A A Legalov
Legalov A.A. 2020a. Annotated key to weevils of the world. Part 4. Subfamilies Erirhininae, Dryophthorinae and Cossoninae (Curculionidae). Ukrainian Journal of Ecology, 10 (2): 319-331.
List of the Curculionidae of the Malay Archipelago
  • F P Pascoe
Pascoe F.P. 1885. List of the Curculionidae of the Malay Archipelago collected by Dr. Odoardo Beccari, L. M. D'Albertis, and others. Annali del Museo Civico di Storia Naturale di Genova, Series 2, 2 [22]: 201-332, pls. 1-3.