Mexico taiwanus ( Satô, 1994 ), 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 : 32-34

Mexico taiwanus ( Satô, 1994) comb. nov.

Figs 11G , 17

Babalimnichus taiwanus Satô, 1994: 174 .

Babalimnichus masamii – Yoshitomi & Arai 2004: 23 .

Material examined

JAPAN • 17 ex.; “Hikawa-hama Yonaguni-jima OKINAWA 18. VI. 2001 Koji TOYODA leg.”; EUMJ • 4 ex.; “Dannuhama Yonaguni-jima 26-VIII-1994 M. Sato leg.”; EUMJ .

TAIWAN • 1 ♂, 1 ♀, 5 ex.; “ Lung Keng Pintung Taiwan 10-VIII-2000 M. Sato leg.”; EUMJ • 1 ex.; “ Mao tantou Pintung, Taiwan 10-VIII-2000 M. Sato leg.”; EUMJ • 1 ex.; “ Lutao Taiwan 26-28. III. 1998 M. Sato leg.”; EUMJ • 5 ex.; “ Lanhsu Taiwan 5–10. VIII. 1998 M. Sato leg.”; EUMJ • 3 ex., in ethanol; “ Fushan Village Donghe Township, Taitung Country, Taiwan 1-V-2013 Tatsuya Niisato leg.”; EUMJ .

Redescription

Male

For a detailed description of the external features, see the original description ( Satô 1994). PW/ PL 1.67–2.44 (2.00); EL/ EW 1.18–1.42 (1.32); EL/ PL 2.33–3.40 (2.87); EW/PW 1.00–1.15 (1.09); TL/ EW 1.59–1.92 (1.78).

Sternite VII ( Fig. 17A ) with two pairs of long, stout extra setae, bearing about 20 long setae, bifid in postero-lateral corners, gently projecting triangularly in median part of caudal margin. Sternite VIII ( Fig. 17B ) small, slightly sclerotized, Y-shaped. Sternite IX ( Fig. 17C ) slender, lightly curved in basal part; apical plates long and slender, pointed at apices. Aedeagus ( Fig. 17 D–F) relatively short, asymmetrical; basal piece oval; lateral lobes short, with 2–4 apical setae; median lobe a little wide, sparsely punctuate in apical part, slightly expanded in apical quarter, pointed at apex; ventral plates relatively slender, separated from median lobe, left one with thumb-like projection on inner margin of apex; ML/ BL 2.42; ML/ LL 2.42.

Female

Sexual dimorphism slight. Sternite VII ( Fig. 17G ) similar to that of male. Urosternite ( Fig. 17H ) well sclerotized, with long and slender apodeme, T-shaped. Ovipositor ( Fig. 17I ) well sclerotized; coxite sparsely punctuate, rather pointed at apices; apices of baculus bifid; approximate ratio of coxite and baculus (n = 1) 1.0:5.3.

Measurements

Unsexed (n = 20): TL 1.68–2.17 (1.95) mm; PW 0.90–1.10 (1.01) mm; PL 0.40–0.60 (0.51) mm; EL 1.28–1.62 (1.44) mm; EW 1.00–1.15 (1.10) mm.

Distribution

Taiwan (including Lutao and Lanhsu Islands), Japan (Yonaguni-jima).

Remarks

This is the first record of this species from Lutao and Lanhsu Islands, off Taiwan, and Yonaguni-jima.

Figures

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. 17. Mexico taiwanus (Satô,1994),male (A–F) and female (G–J) genitalia (EUMJ). A, G. Sternite VII. B. Sternite VIII. C. Sternite IX. D. Aedeagus, ventral view. E. Aedeagus in dorsal view. F. Aedeagus in right lateral view. H. Urosternite. I. Ovipositor. J. Spermatheca.