Elmomorphus depressus, 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 : 63-66

Elmomorphus depressus sp. nov.

urn:lsid:zoobank.org:act:C5A3782F-D98D-47D6-A54B-2E55AE76E8C9

Figs 27 , 28C , 109E

Differential diagnosis

Elmomorphus depressus sp. nov. ( Fig. 27 ) is characterised by the presence of plastron on the cranial surface (except for a semicircular area on the vertex), the anterior angles of the pronotum, and the lateral sides of the elytra. The body is small and broadly oval. Elytron with nine longitudinal rows of large punctures and numerous small punctures scattered between the rows. Similar characters are also present in E. hongkong sp. nov. and E. sulcatus sp. nov. It can be separated from these species by the presence of a transverse median depression on the prosternal process. The well-impressed elytral striae distinguish this species from E. hongkong . The strial punctures are well separated by ca 0.5–2.0 × puncture diameters, while in E. sulcatus , these punctures are not distinctly delimited, often confluent. Furthermore, all ventrites, except for the median portion of the first one, are entirely covered with plastron. In E. sulcatus , a plastron is missing in the middle of the first two ventrites.

Etymology

The epithet is a Latin adjective in the nominative singular referring to the depression on the prosternal process.

Type material

Holotype

China – Guangxi Autonomous Region • ♀; “CHINA: Guangxi 1993 Dist. Lipu 120km S Guilin Berge bei [mountains near] Siuren | 12.11., 350m leg. Schönmann et Schillhammer (19) [CWBS 41]”; IAECAS.

Type locality

China, Guangxi Autonomous Region, Guilin Prefecture, Lipu County, ca 120 km south of Guilin, ca 80 km east of Liuzhou City, Siuren Village; fast flowing stream, ca 1 m wide, unpolluted, partly shaded, gravel and rocks, numerous small waterfalls, volcanic, ca 350 m a.s.l. (CWBS 41; Jäch & Ji 1995).

Description

Measurements (mm): TL: ♀ 3.58 (n= 1); PL: ♀ 0.89 (n= 1); PW: ♀ 1.46 (n=1); EL: ♀ 2.47 (n =1); EW: ♀ 1.74 (n=1).

Body oblong oval, moderately convex dorsally ( Fig. 27 ). Integument black; mouth parts, antennae, trochanters, and tarsi reddish brown. Pubescence consisting of short sparse yellowish setae. Plastron present on head (except for semicircular area on vertex), on anterior angles of pronotum, lateral portions of elytra, and on ventral surface except for prosternal process, and median parts of metaventrite and ventrite 1.

Dorsal surface of head with round punctures smaller than an eye facet, separated by 0.5–1.0 × puncture diameter; plastron present on entire surface, except semicircular area on vertex. Labrum transverse with anterior margin broadly emarginate; exposed portion microreticulate, with small setiferous punctures. Anterior margin of clypeus straight. Eyes oval, interfacetal setae short, ID: ♀ 0.52 mm (n =1), APD/ ID: ♀ 1.71 (n =1). Antennae 10-segmented, densely setose.

Pronotum transverse, widest at base, PW/PL: ♀ 1.63 (n=1); rim of anterior margin complete, twice as wide as diameter of eye facets; anterior angles strongly deflexed, prominent; lateral sides convergent, rounded; surface smooth, punctures round; plastron confined to anterolateral portions. Prosternal process wider than long, lateral and apical edges rounded; lateral portions moderately raised; with transverse depression before posterior margin. Scutellum wider than long with small round punctures. Metaventrite with convex median part. Elytra oblong oval, convex, EL/EW: ♀ 1.42 (n= 1), widest around middle; surface distinctly microreticulate, with small, scattered punctures and large deep punctures arranged in nine longitudinal rows, punctures separated by ca 0.5–2.0 diameters; plastron forming two lateral bands, anteriorly almost reaching elytral base, extending from lateral margin to sixth row in proximal half, then slightly extending posteriorly. Tibiae slightly curved; protibia ca 1.4× as long as protarsus; PrTL/ LPL: ♀ 1.02 (n =1). Terminal protarsomere as long as all preceding tarsomeres combined.

Ventrites covered with plastron, except for median portion of ventrite 1. Ventrite 5 with short longitudinal keel. Bursa copulatrix without microsclerites ( Fig. 28C ).

Secondary sexual dimorphism

Male unknown.

Distribution

China (Guangxi) ( Fig. 109E ).

Figures

Fig. 27. Elmomorphus depressus sp. nov., holotype, female (IAECAS), TL: 3.58 mm.

Fig. 28. Bursa copulatrix and vagina. A. Elmomorphus elmoides sp. nov., paratype from type locality (NMW). B. E. calvus sp. nov., paratype from type locality (CKB). C. E. depressus sp. nov., holotype (IAECAS). Scale bar: 0.1 mm.

Fig. 109. Distribution maps. A. Elmomorphus fusiformis sp. nov. B. E. elmoides sp. nov. C. E. calvus sp. nov. D. E. hongkong sp. nov. E. E. depressus sp. nov. F. E. sulcatus Kodada, Selnekovič & Jäch sp. nov.