Elmomorphus simplipes, Selnekovič & Jäch & Kodada, 2024

Selnekovič, Dávid, Jäch, Manfred A. & Kodada, Ján, 2024, Taxonomic revision of the genus Elmomorphus Sharp, 1888. II. Redescription of the genus and review of the species from India, Nepal, Bhutan, Myanmar, China, Thailand, Laos, Cambodia, and Vietnam (Coleoptera: Dryopidae), European Journal of Taxonomy 957, pp. 1-229 : 127-131

Elmomorphus simplipes sp. nov.

urn:lsid:zoobank.org:act:85D2B8A7-D3C1-4D2C-8765-A3D3181E5489

Figs 61–62 , 67A , 112D

Differential diagnosis

Elmomorphus simplipes sp. nov. ( Fig. 61 ) belongs to a group of species characterised by having a dorsal plastron distributed on the anterior portions of the head and the posterolateral portions of the elytra. Elytral punctures are scattered over the entire surface and striae are absent. Males bear conspicuous, long, erect setae or setal clusters on the labrum, prosternal process, and metaventrite. The metaventrite is strongly depressed in males. With E. paradonatus sp. nov. and E. donatus sp. nov., it shares the simple metatibiae without teeth. However, E. simplipes can be distinguished from the latter two species by the smaller and less convex body (TL in E. simplipes : ♂♂ 2.59–2.97 mm (2.81 ±0.09, n =25), ♀♀ 2.91– 3.19 mm (3.01± 0.08, n= 20), in E. donatus : ♂♂ 3.09–3.50 mm (3.30± 0.10, n=20), ♀♀ 3.35–3.66 mm (3.51 ± 0.09, n= 19), in E. paradonatus ♂♂ 2.97–3.58 mm (3.24± 0.14, n=20), ♀♀ 3.14–3.79 mm (3.34 ± 0.14, n=20) ( Fig. 61 ) and by the arrangement of the spines of the bursa copulatrix ( Fig. 67A ). Elmomorphus curvipes sp. nov., E. dentipes sp. nov., and E. similis sp. nov. differ in the presence of metatibial teeth in males ( Figs 68 , 70 , 72 ) and the arrangement of the spines of the bursa copulatrix ( Fig. 74 ).

Etymology

The epithet, a Latin adjective in the nominative singular, refers to the tibiae lacking teeth, swellings, or apical expansions.

Type material

Holotype

VIETNAM – Vinh Phúc Province • ♂; “N-VIETNAM: Tam Dao (2) 1.- 8.6.1996 leg. Dembicky & Pacholatko ”; NMW.

Paratypes

VIETNAM – Vinh Phúc Province • 80 ♂♂, 111 ♀♀; same collection data as for holotype; CKB, NMW.

Type locality

Vietnam, Vinh Phúc Province, Tam Dao.

Description

Measurements (mm): TL: ♂♂ 2.59–2.97 (2.81± 0.09, n= 25), ♀♀ 2.91–3.19 (3.01± 0.08, n= 20), PL: 0.58–0.68 (0.64 ± 0.03, n= 25), ♀♀ 0.63–0.70 (0.66 ±0.02, n=20); PW: ♂♂ 1.15–1.33 (1.26± 0.04, n= 25), ♀♀ 1.25–1.43 (1.35± 0.04, n =20); EL: ♂♂ 2.01–2.31 (2.17 ±0.06, n=25), ♀♀ 2.24–2.50 (2.35 ± 0.06, n=20), EW: ♂♂ 1.36–1.56 (1.49 ±0.04, n =25), ♀♀ 1.53–1.69 (1.60± 0.05, n =20); PhL: 0.88–1.00 (0.95± 0.02, n =25); PrL: 0.58–0.64 (0.61± 0.02, n= 25).

Body narrowly oval, convex dorsally, widest before midlength of elytra ( Fig. 61 ). Integument dark brown to black; mouthparts, antennae, trochanters, and tarsi reddish brown. Pubescence consists of very short sparse yellowish setae. Plastron present on anterior portions of head, apicolateral portions of elytra, and on ventral surface, except prosternal process, middle of metaventrite, and middle of ventrites 1–2.

Head with small round setiferous punctures, slightly smaller than eye facets, separated by about one puncture diameter; microreticulation absent; plastron covering anterior portions. Labrum transverse, anterior margin slightly rounded, surface microreticulate, males with conspicuous setae about twice as long as exposed portion of labrum. Anterior margin of clypeus straight. Antennae 9-segmented. Eyes oval, interfacetal setae short; ID: ♂♂ 0.40–0.45 mm (0.43 mm ±0.01, n=25), ♀♀ 0.41–0.49 mm (0.46 mm ± 0.02, n= 20); APD/ID: ♂♂ 1.58–1.78 (1.70 ± 0.04, n=25), ♀♀ 1.62–1.82 (1.71 ± 0.05, n= 20).

Pronotum wider than long, widest at base; PW/PL: ♂♂ 1.85–2.17 (1.99± 0.08, n=20), ♀♀ 1.92–2.10 (2.04 ± 0.04, n=20); surface with round setiferous punctures; microreticulation absent; plastron absent; rim of anterior margin as wide as three eye facets; anterior angles moderately deflexed, prominent; lateral pronotal sides convergent, slightly rounded before anterior angles. Lateral margins of prosternal process divergent and straight; posterior edge broadly V-shaped; lateral portions slightly raised, with clusters of long setae in males; median keel slightly arcuate. Scutellum longer than wide, with sparse round punctures, microreticulation absent. Disc of metaventrite in males slightly depressed, with two groups of long setae; lateral margins of metaventral process raised, separated by shallow ridge. Elytra oval, widest before middle, EL/EW: ♂♂ 1.41–1.51 (1.45 ±0.02, n= 25), ♀♀ 1.43–1.52 (1.47± 0.02, n= 20); dorsal surface with round setiferous punctures; microreticulation very fine; plastron confined to apicolateral portions and to epipleura. Tibiae slightly curved; protibia ca 1.3× as long as protarsus; metatibia simple, without tooth; PrTL/PL: ♂♂ 1.09–1.56 (1.19± 0.09, n =25), ♀♀ 1.04–1.15 (1.09± 0.03, n= 20). Terminal protarsomere as long as three preceding tarsomeres combined.

Ventrites covered with plastron, except for middle of ventrites 1–2. Apical margin of ventrite 5 rounded in males, with small median triangular excision in females; in both sexes with short longitudinal keel before apex. Aedeagus ( Fig. 62 ): phallobase slightly expanded proximally, PhL/PrL: 1.47–1.70 (1.55± 0.05, n=25); parameres evenly narrowed to apices, curved ventrad, apices narrowly rounded (lateral aspect); penis narrowly rounded apically in dorsal aspect, expanded and curved ventrad in lateral aspect; sclerotised fibula rather slender. Ovipositor: valvifers ca 1.90 × as long as coxites; right coxite ca 1.30 × as long as left one. Bursa copulatrix ( Fig. 67A ) with microsclerites scattered over dorsal portions, sometimes forming a regular row; spermatheca tubular with accessory gland.

Secondary sexual dimorphism

Labrum, lateral rims of prosternal process, and median part of metaventrite in males with groups of long setae. Terminal ventrite in females with small apical excision.

Distribution

Vietnam ( Fig. 112D ).

Figures

Fig. 61. Elmomorphus simplipes sp. nov., paratype, male from type locality (CKB), TL: 2.81 mm.

Fig. 62. Elmomorphus simplipes sp. nov., holotype (NMW), aedeagus. A. Lateral aspect. B. Ventral aspect. Scale bar: 0.1 mm.

Fig. 67. Bursa copulatrix and vagina. A. Elmomorphus simplipes sp. nov., paratype from type locality (CKB).B. E. donatus Kodada, Selnekovič & Jäch sp. nov., holotype (NMW), lateral aspect. C. E. donatus, holotype (NMW), ventral aspect. D. E. paradonatus sp. nov., holotype (IAECAS). Scale bar: 0.1 mm.

Fig. 112. Distribution maps. A. Elmomorphus bispinosus sp. nov. B. E. nepalensis Satô, 1981. C. E. punctulatus sp. nov. D. E. simplipes sp. nov. E. E. donatus Kodada, Selnekovič & Jäch sp. nov. F. E. paradonatus sp. nov.

Fig. 68. Elmomorphus similis sp. nov., male from China, locality CWBS 354 (CKB), TL: 3.13 mm.

Fig. 70. Elmomorphus dentipes sp. nov., paratype, male from type locality (NMW), TL: 2.90 mm.

Fig. 72. Elmomorphus curvipes sp. nov., paratype, male from type locality (NMW), TL: 3.20 mm.

Fig. 74. Bursa copulatrix and vagina. A. Elmomorphus similis sp. nov., specimen from China, locality CWBS 378 (NMW). B. E. dentipes sp. nov., specimen from China, locality CWBS 354 (NMW). C. E. curvipes sp. nov., specimen from China, locality CWBS 260 (NMW). Scale bar: 0.1 mm.