Lycocerus yitingi Hsiao & Okushima, 2016

Hsiao, Yun, Okushima, Yûichi, Yang, Ping-Shih & Ko, Chium-Cheng, 2016, Taxonomic revision of the Lycocerus hanatanii species group (Coleoptera, Cantharidae), with the description of new species from Taiwan, European Journal of Taxonomy 170, pp. 1-33 : 11-15

Lycocerus yitingi Hsiao & Okushima sp. nov.

urn:lsid:zoobank.org:act:B425500E-BCB5-4BD2-A57A-2AB9CA8700E4

Figs 2 C–E, 3D–F, 6C–D, 7

Diagnosis

This species resembles L. pictus ; the differential diagnosis is given in Table 2 .

Etymology

The specific epithet is dedicated to one of its collectors, Mr. Yi-Ting Chung (Pingtung, Taiwan).

Material examined

Holotype

TAIWAN: ♂, Dahanshan , 1000m, Pingtung, 26 Feb. 2013, Y.-T. Chung leg. ( NMNS).

Paratypes

TAIWAN: 3 ♂♂, 4 ♀♀, same data as for holotype (2 ♂♂, 2 ♀♀ in NMNS; 1 ♂, 2 ♀♀ in YHC); 1 ♀, Chufengkou, Manchou , Pintung , 15 Jan. 1998, C.- S. Lin leg. ( NMNS); 2 ♂♂, 3 ♀♀, Chun Jin [=Chunrih], 950–1000m, Ping Tung Co., 21 Mar. 2000, C.- L. Li leg. ( KURA).

Other material

TAIWAN: 1 ♂, 1 ♀, Chihpen-spa, Peinan Hsiang, Taitung, 5 Apr. 2004, T. Tsuru leg. ( KURA); 1 ♀, Roshan Waterfall, Fuli, Hualien, 16 Feb. 2014, W.- J. Huang leg. ( YHC); 2 ♀♀, Majia, Pingtung, 12 Mar. 2014, Y.-T. Chung leg. ( YHC).

Description

Coloration

Eyes black. Head dark yellow, with black marking on vertex. Antennae brownish yellow. Pronotum dark yellow, with black marking in medio-longitudinal part. Elytra fuscous, with wide, pale yellow longitudinal stripe on each elytron. Legs black, with costae, trochanters and basal parts of femora dark yellow; tibiae with dark yellow tinge. Prosternum dark yellow, mesoventritres, metaventrites and abdomen black, with margin of abdominal ventrites pale yellow. Body closely covered with fine yellowish pubescence; anterior margin of clypeus fringed with pale bristles; antennae, elytra and legs with some yellowish bristles intermingled with primary pubescence.

Male ( Fig. 2C )

HEAD. Nearly as long as wide; vertex faintly hollowed, depressed along apical margin of clypeus and in lateral areas before eyes; surface densely and finely punctate and semilustrous; anterior margin of clypeus arcuate and faintly indented in middle; eyes not so large, globular and slightly prominent, ratio of eye diameter to interocular space 1:4.6; terminal labial palpomeres rounded ax-shaped; terminal maxillary palpomeres rounded ax-shaped; antennae filiform, extending to elytral midlength; antennomere I clavate, II short and a little expanded apicad, III to XI subcylindrical, all antennomeres without groove, ratio of antennomere lengths: 11: 10: 12:16: 16: 16: 15: 15:14: 13: 14.

PRONOTUM. Subquadrate, about 0.90 times as wide as head, about 1.10 times as long as wide; anterior and posterior margins moderately arcuate; lateral margins feebly sinuate, slightly diverging posteriorly; anterior angles rounded; posterior angles obtuse; dorsum convex in postero-lateral and hollowed in anterolateral areas; medio-longitudinal groove distinct in posterior half; surface smooth and semilustrous. Scutellum triangular with rounded apex.

ELYTRA. Conjointly about 1.5 times as wide as pronotum, about 3.1 times as long as wide, sides subparallel; surface covered with minute grains and without luster.

LEGS. Moderately slender; femora mostly straight; tibiae mostly straight, with basal part feebly arcuate; claws simple.

AEDEAGUS ( Fig. 3 D–F). Ventral process expanded apically, apex curved inwards, basal part broad and extending inwards onto ventral side; dorsal plate of each paramere as long as ventral process, stout, apical margin rounded, with some hairs on it, concave on inner margin. Laterophyse very short and truncated apically, invisible in lateral view. Inner sac swollen, lengthened behind, and somewhat shorter than tegmen.

Body length 4.95–6.70 mm (holotype: 5.00 mm); width 1.00– 1.70 mm (1.00 mm).

Female ( Fig. 2D )

Similar to male. Body wider than in male. Eyes somewhat smaller than in male, ratio of eye diameter to interocular space 1:5.1. Antennae distinctly shorter than in male, barely exceeding humeri, ratio of antennomere lengths: 11: 10: 11: 13: 13: 13: 12: 12:11: 10: 12.

PRONOTUM. Nearly as wide as head, slightly longer than width. Elytra conjointly about 1.5 times as wide as pronotum, about 2.9 times as long as wide. Claws simple. Abdominal ventrite VII widely emarginate on each side of terminal margin, forming subtriangular lateral lobes, median lobe moderately developed and triangularly concave in middle ( Fig. 6C ).

FEMALE GENITALIA ( Fig. 6D ). Vagina stout and abruptly extended apically as a long and thick duct; diverticulum and spermathecal duct arising from apex of long duct of vagina; diverticulum moderately thin and spiral; spermathecal duct shorter than diverticulum; spermatheca provided with a thin spiral tube, tube longer than diverticulum; accessory gland thin, shorter than spermatheca.

Body length 6.00– 7.50 mm; width 1.30–1.80 mm.

Remarks

Several examined specimens listed as other material were different from the type by having the head, antennae, thorax, basal half of the femora and tibiae orange yellow; the black markings on the vertex, pronotum and legs smaller or indistinct; elytra mostly dark yellow, with suture and lateral sides narrowly black ( Fig. 2E ), but display no distinct differences compared to the type specimens on the structure of the aedeagus. Because insufficient materials were available and distinct diagnostic characters were not discovered, we herein prefer to regard these specimens as representing a color variation of L. yitingi sp. nov. rather than giving it a new taxonomic status. Nevertheless, we choose not to place these specimens among the paratypes because they will possibly be confirmed as a new taxon in the future after more material is examined.

Distribution ( Fig. 7 )

Taiwan (endemic).

Figures

Fig. 2. Habitus, dorsal view. A–B. Lycocerus pictus (Wittmer, 1983). C–E. L. yitingi Hsiao & Okushima sp. nov. F–G. L. araticollis (Fairmaire, 1897). H–I. L. griseopubens (Pic, 1928). J–M. L. nigripennis (Pic, 1938). N–O. L. aurantiacus Hsiao & Okushima sp. nov. P–Q. L. evangelium Hsiao & Okushima sp. nov. R. L. kintaroi Hsiao & Okushima sp. nov. C, F, H, J, N, P, R. Name-bearing types. D, O, Q. Paratypes. A–B, E, G, I, K–M. Non-type specimens. A, C, F–G, I, K–L, N, P, R. Male. B, D–E, H, J, M, O, Q. Female. Scale bars: 1.0 mm.

Fig. 3. Aedeagus. A–C. Lycocerus pictus (Wittmer, 1983). D–F. L. yitingi Hsiao & Okushima sp. nov. A, D. Ventral view. B, E. Lateral view. C, F. Dorsal view. Scale bars: 0.5 mm.

Fig. 6. A–B. Lycocerus pictus (Wittmer, 1983). C–D. L. yitingi Hsiao & Okushima sp. nov. E–F. L. nigripennis (Pic, 1938). G–H. L. aurantiacus Hsiao & Okushima sp. nov. I–J. L. evangelium Hsiao & Okushima sp. nov. A, C, E, G, I. Abdominal ventrite VII of female. B, D, F, H, J. Female genitalia, lateral view. Scale bars: A, C, E, G, I = 1.0 mm; B, D, F, H, J = 0.5 mm.

Fig. 7. Distribution map of Lycocerus pictus (Wittmer, 1983) and L. yitingi Hsiao & Okushima sp. nov. from Taiwan.