Elmomorphus auripilosus, 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 : 35-38

Elmomorphus auripilosus sp. nov.

urn:lsid:zoobank.org:act:B1D72FC6-85A8-401E-9C58-D0577692D47A

Figs 11C , 13 , 18A , 108D

Differential diagnosis

Elmomorphus auripilosus sp. nov. ( Fig. 13 ) is characterised by having a plastron on the entire cranial surface, along the lateral margins of the pronotum, and on the entire surface of the elytra. The ventral plastron is absent in the prosternal process and the median part of the metaventrite. Males possess several long and erect setae on the labrum and hardly discernible clusters of few erect setae anterolateral of the prosternal process and on posterolateral parts of metaventral disc. Proximal and distal part of bursa copulatrix with numerous sclerotised spines, especially distally ( Fig. 18A ).

Elmomorphus auripilosus sp. nov. most closely resembles E. brevicornis , from which it differs in the wider pronotal plastron bands, the distinctly shallower elytral strial punctures, the shorter phallobase ( Fig. 11C ), and the differently arranged spines on the bursa copulatrix ( Fig. 18A ). Males of E. amamiensis and E. parabrevicornis sp. nov. differ in the presence of conspicuous long setae on the labrum, prosternal process and median part of the metaventrite. In E. auripilosus , the phallobase is proportionally shorter, PhL/PrL: 1.84–2.26 (2.09 ± 0.16, n=10) ( Fig. 11C ) than in E. amamiensis (PhL/PrL: 2.32–2.74 (2.43± 0.12, n =7)), E. brevicornis (PhL/PrL: 2.14–2.36 (2.24 ±0.07, n=11)), and E. parabrevicornis (PhL/PrL: 2.59–2.89 (n=3); Fig. 11A–B ) but distinctly more prolonged than in E. auratus sp. nov. (PhL/PrL: 1.29–1.62 (1.43±0.08, n=20); Fig. 15 ) and E. horaki sp. nov. (PhL/PrL: 1.63–1.83 (1.75± 0.06, n = 10); Fig. 17 ).

Etymology

The epithet is a Latin adjective in the nominative singular, referring to the golden colour of the pubescence and plastron, covering almost the entire body surface.

Type material

Holotype

VIETNAM – Lao Cai Province • ♂; “N-VIETNAM 1991 Sapa (Lao Cai) leg. E. Jendek | 25.5. - 10.6. 22 °20′N 103°50′E ”; NMW.

Paratypes

VIETNAM – Lao Cai Province • 27 ex.; same collection data as for holotype; CKB, NMW. – Ninh Binh Province • 21 ex.; “ N-VIETNAM 1991 Cuc-Phuong Nationalpark | 2. – 12. V. 100 km S Hanoi leg. E. Jendek ”; CKB, NMW • 1 ex.; “ N-VIETNAM 2. - 12.V. CUC PHUONG N. P. 100 km S Hanoi leg. E. Jendek 1991 ”; CKB • 4 ex.; “ VIETNAM N. Cuc Phuong 2. - 11.V.91 Strnad Jan lgt.”; CKB. – Vinh Phúc Province • 21 ex.; “ VIETNAM NORTH Pr. VINH PHU [C], TAM DAO 6.- 25.5. 1990 O. ŠAUŠA LGT.”; CKB .

Type locality

Vietnam, Lao Cai Province, Sa Pa, 22°20′ N, 103°50′ E.

Description

Measurements (mm): TL: ♂♂ 3.07–3.38 (3.23 ± 0.09, n= 10), ♀♀ 3.06–3.51 (3.29 ± 0.14, n= 10); PL: ♂♂ 0.70–0.78 (0.74 ± 0.02, n= 10), ♀♀ 0.68–0.78 (0.75 ±0.03, n=10); PW: ♂♂ 1.19–1.33 (1.28± 0.05, n= 10), ♀♀ 1.17–1.40 (1.31 ± 0.06, n =10); EL: ♂♂ 2.37–2.60 (2.49 ± 0.07, n=10), ♀♀ 2.37–2.73 (2.54 ± 0.11, n= 10); EW ♂♂ 1.37–1.56 (1.49± 0.05, n=10), ♀♀ 1.43–1.61 (1.54± 0.05, n=10); PhL: 0.72–0.85 (0.80± 0.05, n =4); PrL: 0.36–0.39 (0.38 ±0.01, n =10).

Body ovate, widest around midlength of elytra, moderately convex dorsally, highest point in anterior third of elytral length ( Fig. 13 ). Body black, except for reddish brown mouthparts, antennae, tarsi, trochanters, and proximal portions of femora; remaining parts of legs dark brown to black. Dorsal vestiture consisting of moderately long thin decumbent yellowish setae arising from small round punctures. Plastron on entire cranial surface, in wide lateral pronotal bands, each covering about a third of pronotal width, and on entire surface of elytra. Plastron on entire ventral surface, except for prosternal process and median part of metaventrite.

Cranial surface entirely covered with plastron, and round setiferous punctures ca 0.75 × as wide as the eye facet and separated by approximately half of the facet diameter. Labrum transverse, anterior margin slightly rounded; exposed portion microreticulate with short decumbent setae in both sexes, and with transverse row of several long semierect setae in males. Eyes oval, moderately protruding; ID: ♂♂ 0.35–0.41 mm (0.39 ± 0.02, n= 10), ♀♀ 0.32–0.43 mm (0.40 ± 0.03, n =10); APD/ID: ♂♂ 2.06–2.32 (2.18 ± 0.08, n=10), ♀♀ 2.04–2.64 (2.18 ±0.16, n =10). Antennae short, 10-segmented, densely setose.

Pronotum transverse, widest at base, strongly convex, PW/PL: ♂♂ 1.65–1.80 (1.72± 0.04, n=10), ♀♀ 1.71–1.79 (1.74 ± 0.03, n= 10); surface smooth, with round setiferous punctures slightly larger than those on head; plastron forming posteriorly tapering lateral bands, separated before anterior pronotal margin by less than eye diameter, and before pronotal base by ca one-third of pronotal width. Anterior pronotal angles strongly deflexed, protruding, and acute; pronotal sides convergent, weakly rounded posteriorly and straight to slightly concave anteriorly. Prosternal process with lateral margins divergent and rounded, posterior edge rounded; lateral margins moderately raised, wide; median keel moderately raised; plastron absent; males with hardly discernible cluster of few erect setae on each side. Scutellum slightly longer than wide, smooth, with several small setiferous punctures. Metaventrite with plastron, except for median, posteriorly narrowed part; metaventral process with lateral margins slightly raised; metaventral disc flat; males with two small, hardly discernible clusters of erect setae posterolaterally. Elytra oblong, widest behind middle, moderately convex, highest point at anterior third; sides rounded, slightly diverging in anterior two-thirds and strongly converging in posterior third; PW/PL: ♂♂ 1.65– 1.80 (1.72± 0.04, n =10), ♀♀ 1.71–1.79 (1.74 ± 0.03, n= 10). Elytral surface entirely covered with plastron; each elytron with small setiferous punctures scattered over entire surface, and larger punctures arranged in nine longitudinal rows in weakly impressed striae; strial punctures about as wide as those on pronotum and separated by 0.5–1.0 × puncture diameter. Tibiae straight; protibia ca 1.2× as long as protarsus; PrTL/PL: ♂♂ 1.08–1.21 (1.15± 0.03, n =10), ♀♀ 1.09–1.18 (1.15 ±0.03, n=10). Terminal protarsomere slightly longer than all preceding segments combined; foreclaws long and strongly curved. Ventrites entirely covered with plastron; intercoxal process subtriangular, lateral sides flat, admedian keels hardly discernible. Ventrite 5 slightly declivous behind anterior margin; in males, apex shallowly emarginate and with small cluster of erect setae; females with small keel at apex and small cluster of erect setae. Aedeagus ( Fig. 11C ): phallobase rather long and slender, distally narrowed, PhL/PrL: 1.84– 2.26 (2.09 ± 0.16, n=10); parameres weakly curved ventrad, apices narrowly rounded in lateral aspect; apex of penis slightly expanded and rounded. Ovipositor: right coxite ca 1.30 × as long as left one; valvifers ca 1.5× as long as right coxite. Bursa copulatrix ( Fig. 18A ) with numerous small sclerotised spines distally, and fewer ones proximally.

Secondary sexual dimorphism

Average length of females larger than those of males. Apex of male ventrite 5 shallowly emarginate, in females with minute excision and small longitudinal keel. Males possess several long erect setae on labrum and small, often inconspicuous clusters of erect setae on anterolateral portions of prosternal process and on posterolateral portions of metaventral disc.

Distribution

Vietnam ( Fig. 108D ).

Figures

Fig. 11. A. Elmomorphus parabrevicornis sp. nov., holotype (IAECAS), aedeagus, lateral aspect. B. Same, ventral aspect. C. E. auripilosus sp. nov., paratype from Vietnam, Tam Dao (CKB), aedeagus, lateral aspect. Scale bar: 0.1 mm.

Fig. 13. Elmomorphus auripilosus sp. nov., paratype, male from Tam Dao, Vietnam (CKB), TL: 3.20 mm.

Fig. 18. Bursa copulatrix and vagina. A. Elmomorphus auripilosus sp. nov., paratype from Cuc Phuong, Vietnam (CKB). B. E. auratus sp. nov., paratype from China, CWBS 246 (CKB). C. E. horaki Kodada, Selnekovič & Jäch sp. nov., paratype from type locality (NMW). Scale bar: 0.1 mm.

Fig. 108. Distribution maps. A. Elmomorphus striatellus Delève, 1968. B. E. siamensis Kodada, Selnekovič & Jäch sp. nov. C. E. parabrevicornis sp. nov. D. E. auripilosus sp. nov. E. E. auratus sp. nov. F. E. horaki Kodada, Selnekovič & Jäch sp. nov.

Fig. 15. Elmomorphus auratus sp. nov., paratype from type locality (NMW), aedeagus. A. Lateral aspect. B. Ventral aspect. Scale bar =0.1 mm.

Fig. 17. Elmomorphus horaki Kodada, Selnekovič & Jäch sp. nov., aedeagus. A. Paratype from type locality (CKB), lateral aspect. B. Same, ventral aspect. C. Paratype from Umphang, Thailand (CKB), lateral aspect. D. Paratype from Umphang, lateral aspect. Scale bar: 0.1 mm.