Mexico papuanus, 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 : 26-28

Mexico papuanus sp. nov.

urn:lsid:zoobank.org:act:DB69DE47-18E6-4FA0-8D94-A9A95470D78E

Figs 11B , 14

Etymology

This species is named after its type locality.

Material examined

Holotype

PAPUA NEW GUINEA • ♂; “NEW GUINEA (NE) Dreikikir , Sepik Distr., 350m 25. VI. 1961 ”; “ J. L. & M. Gressitt Collectors ”; BPBM.

Paratypes

PAPUA NEW GUINEA • 1 ♂, 1 ♀; same collection data as for holotype; BPBM • 1 ♀; same collection data as for holotype but “ 23. VI. 1961 ”; BPBM • 1 ♀; same collection data as for holotype but “ 24. VI. 1961 ”; BPBM • 1 ♀; “NEW GUINEA: NETH. VOG ELKOP: Bomberi 700–900m, VI-9 -‘59”; “ J. L. Gressitt Collector ”; BPBM • 1 ♂; “NE New Guinea Morabe Distr. 10km W Bulolo 780m, 5–25. VIII, 1967”; “Malaise tr. over stream”; “ R. Straatman Collector BISHOP MUS.”; BPBM • 1 ♂; “NE NEW GUINEA Akivitana Riv. 1550m, 10. I. 65 ”; “ J. & M. Sedlacek Collectors BISHOP MUSEUM”; BPBM • 1 ♂; “NEW GUINEA: NETH. Waris, S. of Hollandia , 450–500m VIII-1-2-1959 ”; “At Light”; “T. C. Maa Collector BISHOP”; BPBM .

Description

Male

BODY. Oval, relatively flat dorsally, shiny, closely covered with suberect golden setae. Coloration of body black; antennae and legs dark brown; elytra with indistinct and irregular silver spots consisting of erect setae.

HEAD. Finely punctate, shallowly depressed on dorsum between eyes; distance between eyes as long as eye diameter in dorsal view.

ANTENNAE. Slender and short, reaching about anterior third of pronotum.

PRONOTUM. Closely and rugosely punctate, with lateral margins almost straight; PW/ PL 2.51–2.71 (2.61). Scutellum small, square.

ELYTRA. Oval, widest at base, gently tapered posteriorly; caudal quarter of lateral margins slightly and minutely serrate; EL/EW 1.35–1.40 (1.38); EL / PL 3.77–4.00 (3.88); EW / PW 1.05–1.11 (1.08); TL / EW 1.71–1.75 (1.73).

ABDOMEN. Sternite VII ( Fig. 14A ) with two (inner and outer) pairs of long and slender setae and two extra setae, pointed in postero-lateral corners, gently projecting triangularly on mesal part of caudal margin. Sternite VIII ( Fig. 14B ) small, slightly sclerotized, Y-shaped. Sternite IX ( Fig. 14C ) wide, gently curved in basal part; apical plates long and slender, pointed at apices.

AEDEAGUS ( Fig. 14 D–F). Long, almost symmetrical; basal piece oval; lateral lobes short, with 4 short apical setae; median lobe slender, sparsely punctuate in apical part, slightly expanded in apical quarters, pointed and somewhat prolonged at apex; ventral plates slender, expanded apically, separated to median lobe; ML/BL 2.35; ML/ LL 2.61.

Female

Sexual dimorphism slight. PW/ PL 2.38–2.45 (2.42); EL/ EW 1.36–1.42 (1.40); EL/ PL 3.70–4.11 (3.85); EW/ PW 1.07–1.18 (1.14); TL/EW 1.73–1.79 (1.76). Sternite VII ( Fig. 14G ) similar to that of male, but postero-lateral corners shallowly concave at apices. Urosternite ( Fig. 14H ) well sclerotized, Y-shaped, with long and slender apodeme. Ovipositor ( Fig. 14I ) well sclerotized; coxite sparsely punctuate, rather pointed at apices; apex of baculus bifid; approximate ratio of coxite and baculus (n = 1) 1.0: 5.6.

Measurements

Male (n = 2): TL 1.75–2.05 (1.90) mm; PW 0.95–1.08 (1.02) mm; PL 0.35–0.43 (0.39) mm; EL 1.40– 1.62 (1.51) mm; EW 1.00–1.20 (1.10) mm. Female (n = 3): TL 1.88–2.30 (2.03) mm; PW 0.95–1.10 (1.01) mm; PL 0.40–0.45 (0.42) mm; EL 1.48–1.85 (1.61) mm; EW 1.05–1.30 (1.15) mm.

Distribution

Papua New Guinea.

Remarks

This species is distinct in the peculiar form of the male genitalia.

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. 14. Mexico papuanus sp. nov., male (A–F) and female (G–I) genitalia (holotype and paratype, BPBM). A, G. Sternite VII. B. Sternite VIII. C. Sternite IX. D. Aedeagus in dorsal view. E. Aedeagus, ventral view. F. Aedeagus, left lateral view. H. Urosternite. I. Ovipositor.