Mexico ogasawaraensis, Yoshitomi, 2019

Yoshitomi, Hiroyuki, 2019, Review of the Asian Thaumastodinae (Coleoptera, Byrrhoidea, Limnichidae), with a phylogeny of the genera, European Journal of Taxonomy 583, pp. 1-45 : 20-23

Mexico ogasawaraensis sp. nov.

urn:lsid:zoobank.org:act:8B1989C3-5D1B-4E9C-A87F-0ED19524F6D4

Figs 4C , 11C , 12

Etymology

This species is named after its type locality.

Material examined

Holotype JAPAN • ♂; “[OG2] Meijima, Hahajima-guntô, Ogasawara Isls., Japan, 26°567418″ N, 142°227674″ E, 23. IX. 2012, H. Yoshitomi leg.”; EUMJ.

Paratypes JAPAN • 4 ♂♂, 2 ex.; same collection data as for holotype; EUMJ • 1 ♂, 1 ♀; same collection data as for preceding; NSMT • 1 ♂, 1 ♀; same collection data as for preceding; NMW • 1 ♀; “[OG5] Minamizaki , Hahajima , Ogasawara Isls., Japan, 26°37.491″ N, 142°10.600″ E, 25. IX. 2012, H. Yoshitomi leg.” ; EUMJ • 4 ♂♂, 2 ex.; “[OG4] Hirashima , Hahajima-guntô, Ogasawara Isls., Japan, 26°35.169″ N, 142°09.177″ E, 24. IX. 2012, H. Yoshitomi leg.”; EUMJ .

Description

Male

BODY. Oval, slightly convex dorsally, shiny, closely covered with suberect golden setae. Coloration of body black; elytra with indistinct and irregular silver spots consisting of erect setae.

HEAD. Closely and finely punctate, slightly convex between eyes; distance between eyes as long as an eye diameter in dorsal view.

ANTENNAE. Short, reaching about anterior third of pronotum.

PRONOTUM. Closely punctate, gently arcuate on lateral margins; PW/ PL 1.92–2.30 (2.09). Scutellum equilateral triangular, punctate as in pronotum.

ELYTRA. Oval, widest at base, gently tapered posteriorly; caudal third of lateral margins slightly and indistinctly serrate; EL/EW 1.40–1.54 (1.48); EL/ PL 3.25–4.00 (3.58); EW/ PW 1.12–1.20 (1.16); TL/ EW 1.80–1.96 (1.89).

ABDOMEN. Sternite VII ( Fig. 12A ) bearing about 40 long setae on mesal part, pointed at postero-lateral corners, slightly projecting on median part of caudal margin. Sternite VIII ( Fig. 12B ) slightly sclerotized, small, Y-shaped. Sternite IX ( Fig. 12C ) moderately sclerotized, relatively wide, strongly curved in basal part, with long and pointed apical plates.

AEDEAGUS ( Fig. 12 D–G). Long and slender, well sclerotized; basal piece oval; lateral lobes short and slender, with three apical setae; median lobe long and slender, slightly expanded in apical fifth, pointed at apex, finely punctuate; ventral plates slender, reaching about apical fifth of median lobe, mostly fused to median lobe; ML/ BL 2.94; ML/ LL 2.42.

Female

Sexual dimorphism slight. Sternite VII ( Fig. 12H ) bearing about 30 long setae on mesal part, pointed but minutely concaved at postero-lateral corners, slightly projecting on median part of caudal margin. Urosternite ( Fig. 12I ) well sclerotized, T-shaped, with long and slender apodeme. Ovipositor ( Fig. 12J ) well sclerotized; coxite sparsely punctuate; apex of baculus bifid; approximate ratio of coxite and baculus (n = 1) 1.0:6.1.

Measurements

Unsexed (n = 20): TL 2.10–2.65 (2.39) mm; PW 0.98–1.20 (1.09) mm; PL 0.45–0.60 (0.52) mm; EL 1.65–2.05 (1.86) mm; EW 1.10–1.40 (1.26) mm.

Distribution

Japan: Ogasawara Islands (Hahajima, Meijima, Hirashima).

Remarks

This species appears to be closely related to M. baliensis sp. nov. based on the shape of the aedeagus, but differs from it in the following characteristics: sternite IX broad (slender in M. baliensis sp. nov.), median lobe pointed at apex (somewhat obtuse in M. baliensis sp. nov.) and apical setae on lateral lobes long (short in M. baliensis sp. nov.).

Biological notes

The type series was collected from the splash zone of wet rocks on a rocky seashore ( Fig. 4C ).

Figures

Fig. 4. Habitats (A–C) and living adults (D–F) of Asian Thaumastodinae Champion, 1924. A. Dondong River, Pengkol, Yogyakarta special Region, Java, Indonesia (type locality of Acontosceles javanicus Yoshitomi & Putra, 2011 (F) and Pseudeucinetus javanicus Yoshitomi & Putra, 2010 (D)). B. Nusa Dua, Bali, Indonesia (type locality of Mexico baliensis sp. nov.). C. Hirashima, Ogasawara, Japan (type locality of Mexico ogasawaraensis sp. nov.). D. Type locality of Pseudeucinetus javanicus Yoshitomi & Putra, 2010. E. Mexico masamii (Satô, 1994) in Shikinejima, Izu Islands. F. Type locality of Acontosceles javanicus Yoshitomi & Putra, 2011.

Fig. 11. Species of Mexico Spilman, 1972. A. M. borneensis sp. nov., holotype (BPBM). B. M. papuanus sp. nov., holotype (BPBM). C. M. ogasawaraensis sp. nov., holotype (EUMJ). D. M. baliensis sp. nov., holotype (EUMJ). E. M. palauensis sp. nov., holotype (EUMJ). F. M. masamii (Satô, 1994) (EUMJ). G. M. taiwanus (Satô, 1994), paratype (EUMJ). Scale bars: 1.0 mm.

Fig. 12. Mexico ogasawaraensis sp. nov., male (A–G) and female (H–J) genitalia (paratypes, EUMJ). A, H. Sternite VII. B. Sternite VIII. C. Sternite IX. D. Aedeagus, ventral view. E. Aedeagus in dorsal view. F. Aedeagus in right lateral view. G. Aedeagus, left lateral view. I. Urosternite. J. Ovipositor.