Elmomorphus catenatus, 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 : 156-160

Elmomorphus catenatus sp. nov.

urn:lsid:zoobank.org:act:81296B2B-27E1-4FD8-AC10-321345E70210

Figs 75–76 , 113D

Differential diagnosis

Elmomorphus catenatus sp. nov. ( Fig. 75 ) is characterised by having the dorsal plastron confined to the cranial surface and the anterolateral portions of the pronotum. The elytra have small punctures scattered on the entire surface and large punctures arranged in nine longitudinal rows. Such a combination of characters is also shared by E. jendeki sp. nov., which differs in the absence of plastron on a large area of the vertex, and on the pronotum it is hardly discernible and confined to several scales in the extremities of the anterior angles. The pronotal and elytral punctures are smaller and less deeply impressed in E. jendeki ( Fig. 77 ), and the parameres are apically narrowly rounded in E. jendeki ( Fig. 78 ), while broadly rounded in E. catenatus ( Fig. 76 ). Elmomorphus catenatus strongly resembles E. fusiformis sp. nov., which can be distinguished by the presence of an elytral plastron ( Fig. 19 ).

Etymology

The epithet is a Latin participle in the nominative singular meaning ‘chained’, referring to the chain-like rows of coarse large elytral punctures.

Type material

Holotype

CHINA – Shaanxi Province • ♂; “China: Shaanxi, Qin Ling Shan 110.06E, 34.27N Hua Shan Mt. N Valley, 1200-1400 m 180 km E Xian , sifted [crossed out]18./ 20.08. 1995,leg. A.Pütz ”; NMW.

Paratypes

CHINA – Shaanxi Province • 2 ♂♂, 1 ♀, 1 ex.; same collection data as for holotype; CKB, CPE, NMW.

Type locality

China, Shaanxi Province, Qin Ling Shan, Hua Shan, 34.27° N, 110.06° E.

Description

Measurements (mm): TL: ♂♂ 4.06–4.34 (n =3), ♀ 4.46 (n =1); PL: ♂♂ 1.04–1.16 (n =3), ♀ 1.21 (n =1); PW: ♂♂ 1.67–1.83 (n=3), ♀ 1.75 (n=1); EL: ♂ 3.02–3.18 (n=3), ♀ 3.25 (n=1); EW: ♂♂ 2.01–2.18 (n=3), ♀ 2.27 (n= 1); PhL: 0.71–0.75 (n =3); PrL: 0.42–0.49 (n=3).

Body oblong-ovate, moderately convex dorsally ( Fig. 75 ). Integument black; mouthparts, antennae, and tarsi reddish brown. Pubescence consisting of sparse short yellowish setae. Dorsal plastron present on head except for small wedge-shaped area on vertex, and anterior angles of pronotum. Ventral plastron absent on prosternal process, median part of metaventrite, and intercoxal process of ventrite 1.

Dorsal surface of head with round setiferous punctures slightly smaller than diameter of an eye facet, separated by 0.5–1.0 × puncture diameter. Labrum transverse, anterior margin shallowly emarginate; exposed portion microreticulate, with small setiferous punctures; setae equal in length in both sexes. Anterior margin of clypeus straight. Eyes oval, interfacetal setae short; ID: ♂♂ 0.57–0.66 mm (n =3), ♀ 0.64 mm (n =1); APD/ID: ♂♂ 1.72–1.85 (n=3), ♀ 1.77 (n=1). Antennae 10-segmented, densely setose.

Pronotum transverse, disc strongly convex, PW/PL: ♂♂ 1.50–1.60 (n =3), ♀ 1.45 (n =1); anterior angles produced, acute; lateral pronotal sides convergent, rounded; dorsal surface smooth, with microgranules in lateral portions, and with large deep round setiferous punctures; plastron present on anterior angles. Prosternal process slightly longer than wide, lateral and posterior edges rounded; lateral portions strongly raised, without groups of long setae; median keel moderately arcuate. Scutellum slightly longer than wide, with small round punctures, apically acute. Metaventrite covered with plastron, except for flat disc; groups of long setae absent; lateral margins of metaventral process raised, medially separated by distinct shallow ridges. Elytra ovate, moderately convex, widest behind middle, EL/EW: ♂♂ 1.46– 1.50 (n =3), ♀ 1.45 (n =1); surface distinctly microreticulate, with small punctures scattered and large deep punctures arranged in nine longitudinal rows. Tibiae nearly straight; protibia ca. 1.3× as long as protarsus; PrTL/PL: ♂♂ 1.09–1.19 (n=3), ♀ 0.89 (n=1). Terminal protarsomere slightly shorter than all preceding tarsomeres combined.

Ventrites covered with plastron, except for middle of ventrite 1 between two longitudinal keels.Aedeagus ( Fig. 76 ): phallobase rather long, slender, PhL/PrL: 1.53–1.68 (n=3); parameres curved ventrad, apices rounded (lateral aspect); penis rounded at apex; sclerotised fibula distinct.

Secondary sexual dimorphism

Females with short longitudinal subapical keel on ventrite 5.

Distribution

China (Shaanxi) ( Fig. 113D ).

Figures

Fig. 75. Elmomorphus catenatus sp. nov., holotype, male (NMW), TL: 4.14 mm.

Fig. 76. Elmomorphus catenatus sp. nov., holotype (NMW), aedeagus. A. Lateral aspect. B. Ventral aspect. Scale bar: 0.1 mm.

Fig. 113. Distribution maps. A. Elmomorphus similis sp. nov. B. E. dentipes sp. nov. C. E. curvipes sp. nov. D. E. catenatus sp. nov. E. E. jendeki Kodada, Selnekovič & Jäch sp. nov. F. E. schillhammeri sp. nov.

Fig. 77. Elmomorphus jendeki Kodada, Selnekovič & Jäch sp. nov., paratype, male from type locality (NMW), TL: 3.60 mm.

Fig. 78. Elmomorphus jendeki Kodada, Selnekovič & Jäch sp. nov., paratype from type locality (NMW), aedeagus. A. Lateral aspect. B. Ventral aspect, detail of parameres and penis. Scale bar: 0.1 mm.

Fig. 19. Elmomorphus fusiformis sp. nov., holotype, male (IAECAS), TL: 4.17 mm.