Elmomorphus schillhammeri, 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 : 164-167

Elmomorphus schillhammeri sp. nov.

urn:lsid:zoobank.org:act:225814A4-A0A7-469E-B2C2-95320BAEFB61

Figs 79–80 , 113F

Differential diagnosis

Elmomorphus schillhammeri sp. nov. ( Fig. 79 ) can be characterised by having the dorsal plastron confined only to small areas around the antennal insertions; the elytral and pronotal plastron is missing. Elytra have nine striae of large, deeply impressed punctures. The pronotal surface is distinctly microreticulate in the form of minute, round dimples. This combination of characters is also shared by E. globosus sp. nov., which can be separated by its greatest body width before the elytral midlength, while in E. schillhammeri it is behind the midlength. The body size is distinctly larger in E. schillhammeri (TL: ♂♂ 4.15–4.36 mm (4.27 ± 0.07, n= 8), ♀♀ 4.03–4.38 mm (4.24 ± 0.13, n=5)) than in E. globosus (TL: ♂♂ 3.42–3.56 mm (n=2), ♀♀ 3.42–3.70 mm (3.55± 0.09, n =10)). Moreover, E. schillhammeri is characterised by the presence of small microgranules on the entire surface of the pronotum and elytra, while in E. globosus , these microgranules are present only in the posterolateral portions of the pronotum. The long erect setae on the male labrum, prosternal process and the median part of the metaventrite are also present in E. ovalis sp. nov. and E. minutus sp. nov., but the absence of the pronotal microreticulation can distinguish these species.

Etymology

The epithet is a proper noun in the genitive case honouring Dr. Harald Schillhammer, an Austrian entomologist (NMW) who collected 14 new species of Elmomorphus in China, Myanmar, and Laos.

Type material

Holotype

CHINA – Guizhou Province • ♂; “CHINA: Guizhou, Leishan Co. SE Kaili , NE Leishan , Leigong Shan , E - slope 26°23.05′N 108°13.03′E | 0.9 km E of pass, 15.6.2001, ca. 1700 m leg. Schillhammer & Wang (CWBS 435)”; IAECAS.

Paratypes

CHINA – Guizhou Province • 17 ex.; same collection data as for holotype; CKB, NMW • 2 ex.; “ CHINA: Guizhou, Leishan Co. SE Kaili, NE Leishan Leigong Shan , E - slope 26°22.56′N 108°13.40′E | ca. 300 m S of pass 14.6.2001, ca. 1700 m leg. Schillhammer & Wang (CWBS 433)”; NMW • 1 ex.; “ CHINA: Guizhou, Leishan Co. SE Kaili, NE Leishan Leigong Shan , E - slope 26°23.07′N 108°13.03′E | ca. 1 Km E of pass 14.6.2001, ca. 1700 m leg. Schillhammer & Wang (CWBS 434)”; NMW • 1 ex.; “ CHINA: Guizhou, Leishan Co. SE Kaili, NE Leishan Leigong Shan , E - slope 26°22.70′N 108°12.01′E | ca. 2 km W of pass 17.6.2001, ca. 1700 m leg. Schillhammer & Wang (CWBS 438)”; NMW .

Type locality

China, Guizhou Province, Qiandongnan Miao Dong Autonomous Prefecture, Leishan County, southeast of Kaili, northeast of Leishan, eastern slope of Leigong Shan, 1 km east of pass between Leishan and Fangxiang Village, ca 1700 m a.s.l., 26°23′03″ N, 108°13′02″ E; small waterfall, debris of dead wood and leaves (CWBS 435; Jäch & Ji 2003).

Description

Measurements (mm): TL: ♂♂ 4.15–4.36 (4.27 ± 0.07, n=8), ♀♀ 4.03–4.38 (4.24± 0.13, n=5); PL: ♂♂ 1.08–1.17 (1.12± 0.03, n =8), ♀♀ 1.04–1.20 (1.11 ± 0.07, n =5); PW: ♂♂ 1.90–2.05 (1.97± 0.04, n= 8), ♀♀ 1.92–2.03 (1.99± 0.05, n =5); EL: ♂♂ 3.02–3.22 (3.14± 0.07, n =8), ♀♀ 2.99–3.18 (3.13 ± 0.08, n =5); EW: ♂♂ 2.34–2.50 (2.43± 0.06, n= 8), ♀♀ 2.39–2.50 (2.45± 0.05, n= 5); PhL: 1.27–1.37 (1.31 ± 0.04, n =8); PrL: 0.54–0.62 (0.58 ±0.02, n =8).

Body ovate, strongly convex dorsally ( Fig. 79 ). Integument black; mouthparts, antennae, and legs reddish brown. Pubescence consisting of very short and thin, almost inapparent yellowish setae. Plastron covering small areas of frontoclypeus around antennal insertions and on ventral surface, except on prosternal process, and median parts of metaventrite and ventrite 1.

Head on dorsal surface microreticulate, with deep, confluent setiferous punctures. Labrum transverse, anterior margin moderately emarginate, dorsal surface microreticulate, with minute setiferous punctures; setae slightly longer in males than in females. Anterior margin of clypeus straight. Eyes oval, interfacetal setae short, ID: ♂♂ 0.75–0.85 mm (0.79± 0.03, n=8), ♀♀ 0.76–0.86 mm (0.81± 0.04, n =5); APD/ ID: ♂♂ 1.40–1.55 (1.46± 0.05, n =8), ♀♀ 1.43–1.47 (1.45± 0.01, n=5). Antennae 11-segmented, densely setose. Terminal maxillary palpomere with lateral sensory area located in middle.

Pronotum transverse, moderately convex, PW/PL: ♂♂ 1.68–1.81 (1.75 ±0.05, n =8), ♀♀ 1.69–1.90 (1.79 ± 0.08,n =5); rim of anterior margin twice as wide as an eye facet, interrupted in middle; anterolateral angles prominent, acute; lateral sides convergent, evenly rounded; surface with microreticulation consisting of minute, densely arranged dimples, with round setiferous punctures; microgranules present on entire surface.Prosternal process wider than long, in males with two groups of long setae anterolaterally; lateral edges divergent, straight; posterior edge rounded; lateral portions wide, strongly raised; median keel moderately arcuate. Scutellum wider than long, with round punctures. Disc of metaventrite slightly convex, median area without plastron posteriorly widened; in males with two groups of long setae; lateral margin of metaventral process raised, separated medially by longitudinal groove. Elytra oval, strongly convex, widest behind middle, EL/EW: ♂♂ 1.24–1.36 (1.29± 0.04, n =8), ♀♀ 1.25–1.31 (1.28± 0.03, n= 5); dorsal surface distinctly reticulate, with microgranules and small scattered punctures; large, deep punctures arranged in nine longitudinal rows and separated by 1–3× puncture diameters. Tibiae slightly curved; protibia ca 1.6× as long as protarsus, PrTL/PL: ♂♂ 1.02–1.09 (1.05 ±0.02, n=8), ♀♀ 0.95–1.02 (0.99 ± 0.03, n=5). Terminal protarsomeres as long as three preceding tarsomeres combined.

Ventrites covered with plastron, except median portion of ventrite 1. Ventrite 5 in males with minute excision at apex. Aedeagus ( Fig. 80 ): phallobase very long, slender, PhL/PrL: 2.16–2.36 (2.25 ± 0.07, n= 8); parameres rather long and slender, moderately curved ventrad, apices rounded (lateral aspect), penis rather slender apically; sclerotised fibula very short.

Secondary sexual dimorphism

Males with long setae on labrum, lateral rims of prosternal process, and median part of metaventrite; and with minute excision at the apex of ventrite 5.

Distribution

China (Guizhou) ( Fig. 113F ).

Figures

Fig. 79. Elmomorphus schillhammeri sp. nov., paratype, male from type locality (CKB), TL: 4.26 mm.

Fig. 80. Elmomorphus schillhammeri sp. nov., paratype from type locality (CKB), 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.