Elmomorphus yunnanensis Kodada, Selnekovič & Jäch, 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 : 108-112

Elmomorphus yunnanensis Kodada, Selnekovič & Jäch sp. nov.

urn:lsid:zoobank.org:act:B604EC65-D889-461B-94D1-351D5091D483

Figs 50–51 , 55B

Differential diagnosis

Elmomorphus yunnanensis sp. nov. ( Fig. 50 ) is characterised by the presence of plastron on the dorsal cranial surface (except for a small triangular area on the vertex) and on the lateral sides of the pronotum and elytra. Elytral punctures are scattered over the entire surface, and distinct longitudinal striae are absent. Such a combination of characters is also present in E. bispinosus sp. nov., E. longitarsis sp. nov., E. sausai sp. nov. and E. umphangicus sp. nov. In E. sausai sp. nov., the elytral plastron bands cover approximately two-thirds of elytral width (in midlength), while in E. yunnanensis sp. nov., they cover approximately one-third; the body is slenderer ( E. sausai sp. nov. EW: ♂♂ 1.50–1.53 mm (1.50± 0.02, n= 4), ♀♀ 1.53–1.63 mm (1.57± 0.04, n=5), E. yunnanensis sp. nov. EW: ♂♂ 1.66–1.80 mm (1.73± 0.06, n= 4), ♀♀ 1.77 mm (n =1)) and shorter ( E. sausai sp. nov. TL: ♂♂ 3.07–3.15 mm (3.10 ± 0.03, n=4), ♀♀ 3.15–3.28 mm (3.21± 0.05, n=5), E. yunnanensis sp. nov. TL: ♂♂ 3.29–3.67 mm (3.37± 0.15, n= 4), ♀♀ 3.51 mm (n= 1). In E. umphangicus sp. nov., the elytra are widest behind the middle, compared to E. yunnanensis sp. nov. with the elytra widest at the middle. The pronotal and elytral surfaces are without metallic lustre in E. yunnanensis sp. nov., whereas in E. sausai sp. nov. and E. umphangicus sp. nov. they are with more or less distinct bronze lustre. Tarsi are shorter than in E. longitarsis sp. nov. and E. bispinosus sp. nov.; the terminal protarsomere is as long as the preceding segments combined, while in the former two species it is longer. The bursa copulatrix has several microsclerites in proximal and lateral portions ( Fig. 55B ), compared to E. longitarsis sp. nov. with four larger microsclerites on each side and E. bispinosus , with one large microsclerite on each side.

Etymology

The epithet is a Latin adjective in the nominative singular referring to the province of Yunnan, the type locality of the species.

Type locality

China, Yunnan Province.

Type material

Holotype

CHINA – Yunnan Province • ♂; “YUNNAN mission” [printed modern label], without further details; NMW.

Paratypes

CHINA – Yunnan Province • 21 ♂♂, 25 ♀♀; same collection data as for holotype; CKB, MNHN, NMW.

Description

Measurements (mm): TL: ♂♂ 3.29–3.67 (3.37 ±0.15, n=4), ♀ 3.51 (n =1); PL: ♂♂ 0.73–0.81 (0.78 ± 0.03, n =4), ♀ 0.83 (n =1); PW: ♂♂ 1.37–1.48 (1.41 ± 0.05, n=4), ♀ 1.48 (n=1); EL: ♂♂ 2.42– 2.73 (2.58 ± 0.13, n=4), ♀ 2.68 (n =1); EW: ♂♂ 1.66–1.80 (1.73± 0.06, n= 4), ♀ 1.77 (n =1); PhL: 0.62 (n=1); PrL: 0.41 (n= 1).

Body oblong oval, strongly convex dorsally ( Fig. 50 ). Integument black; mouth parts, antennae, and tarsi reddish-brown. Pubescence consists of very short yellowish setae. Plastron present on dorsal surface of cranium (except triangular area on vertex), on lateral sides of pronotum and elytra, and on ventral surface except prosternal process, median part of metaventrite, and middle of first two ventrites.

Dorsal head surface with round punctures smaller than eye facets, puncture spacing approximately equal to puncture diameter. Plastron on dorsal cranial surface, except triangular area on vertex. Labrum transverse, anterior margin moderately emarginate, exposed portion microreticulate, with setiferous punctures; setae equal in length in both sexes. Anterior margin of clypeus straight. Interfacetal setae short; ID: ♂♂ 0.46–0.51 mm (0.47 ±0.02, n=4), ♀ 0.50 mm (n= 1). Antennae 10-segmented, densely setose.

Pronotum transverse, widest at base, moderately convex, PW/PL: ♂♂ 1.75–1.89 (1.80 ± 0.06, n =4), ♀ 1.78 (n=1); width of rim of anterior margin equals about width of 2–3 eye facets; anterior angles protruding, acute; lateral pronotal sides convergent, slightly rounded; dorsal surface smooth, with round setiferous punctures; plastron bands covering entire lateral sides. Lateral and posterior edges of prosternal process rounded; lateral portions raised, without clusters of long setae; median keel arcuate. Scutellum longer than wide, acute at apex. Metaventrite with median part moderately convex, widened posteriorly; lateral margin of metaventral process raised, separated medially by shallow longitudinal groove. Elytra elongate oval, moderately convex, widest around middle, EL/EW: ♂♂ 1.45–1.51 (1.49± 0.03, n=4), ♀ 1.51 (n =1); surface finely microreticulate; punctures scattered; plastron forming wide lateral bands anteriorly almost reaching elytral base, expanding posteriorly, each covering about one-third of elytron width (along elytral midlength). Tibiae straight; protibia ca 1.2 × as long as protarsus; PrTL/PL: ♂♂ 1.01–1.10 (1.09± 0.03, n=4), ♀ 1.02 (n =1). Terminal protarsomere as long as all preceding tarsomeres combined.

Ventrites covered with plastron, except for middle of first two ventrites. Ventrite 5 in males emarginate at apex; in females rounded, with short longitudinal keel. Aedeagus ( Fig. 51 ): phallobase rather slender, PhL/PrL: 1.52 (n=1); parameres moderately curved ventrad, apices rounded (lateral aspect); penis rounded apically; sclerotised fibula distinct. Bursa copulatrix with several microsclerites in proximal and lateral portions ( Fig. 55B ).

Secondary sexual dimorphism

Ventrite 5 in males emarginate at apex; in females rounded, with short longitudinal keel.

Distribution

China (Yunnan).

Figures

Fig. 50. Elmomorphus yunnanensis Kodada, Selnekovič & Jäch sp. nov., paratype, male from type locality (CKB), TL: 3.37 mm.

Fig. 51. Elmomorphus yunnanensis Kodada, Selnekovič & Jäch sp. nov., paratypes (NMW) from type locality (NMW), aedeagus. A. Lateral aspect. B. Lateral aspect. C. Ventral aspect, detail of parameres and penis. Scale bars: 0.1 mm.

Fig. 55. Bursa copulatrix and vagina. A. Elmomorphus parvulus sp. nov., paratype from type locality (CKB). B. E. yunnanensis Kodada, Selnekovič & Jäch sp. nov., paratype from type locality (CKB). C. E. longitarsis sp. nov., paratype from type locality (NMW). D. E. bispinosus sp. nov., holotype (IAECAS). Scale bar: 0.1 mm.