Elmomorphus oblongus, 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 : 199-202

Elmomorphus oblongus sp. nov.

urn:lsid:zoobank.org:act:EBE16BA6-51C3-4D05-8231-D6D949DD8BEC

Figs 98–99 , 106B , 115D

Differential diagnosis

Elmomorphus oblongus sp. nov. ( Fig. 98 ) is characterised by having elytra with scattered punctation lacking longitudinal rows of large punctures. The dorsal plastron is present only on the frontoclypeus reaching the level of the midlength of the eyes. Ventrite 1 is entirely covered with plastron; ventrite 5 is without plastron on the median area before the apex and the area without plastron extends laterad along the posterior margin. The species generally resembles E. comosiclunis sp. nov., E. glabriclunis sp. nov., and E. simplex sp. nov. but differs from all of them in the presence of plastron on almost the entire frontoclypeus and in the oblong oval and less convex body ( Fig. 98 ). Moreover, from E. comosiclunis , it differs in the absence of long setae on ventrite 5. From E. glabriclunis , it differs in the evenly convex ventrite 5, without a large glabrous area.

Etymology

The epithet ‘oblongus’ (‘oblong’) is a Latin adjective referring to the characteristic elongate body shape.

Type material

Holotype

VIETNAM – Lam Dong Province • ♂; “S-VIETNAM: 17.- 21.4. 12 km N Dalat 1995 Lang Bian ǀ 12°03′N 108°27′E 1580 - 1750 m Pacholatko & Dembicky ”; NMW.

Paratypes

VIETNAM – Lam Dong Province • 139 ex.; same collection data as for holotype; CKB, NMW.

Type locality

Vietnam, Lam Dong Province, Lang Bian, 12°3′ N, 108°27′ E.

Description

Measurements (mm): TL: ♂♂ 3.21–3.50 (3.34± 0.09, n=8), ♀♀ 3.42–3.58 (3.48± 0.05, n=8); PL: ♂♂ 0.71–0.81 (0.76 ± 0.03, n= 8), ♀♀ 0.73–0.83 (0.79 ±0.03, n=8); PW: ♂♂ 1.40–1.57 (1.51 ± 0.05, n= 8), ♀♀ 1.50–1.60 (1.56± 0.03, n =8); EL: ♂♂ 2.54–2.75 (2.64± 0.06, n =8), ♀♀ 2.71–2.88 (2.76 ± 0.05, n =8); EW: ♂♂ 1.67–1.79 (1.74± 0.04, n= 8), ♀♀ 1.75–1.90 (1.83± 0.04, n= 8); PhL: 0.47–0.51 (0.49± 0.01, n =8); PrL: 0.39–0.42 (0.41 ±0.01, n =8).

Body oblong oval, strongly convex, widest between first and second thirds of elytra ( Fig. 98 ). Colouration black, antennae, mouthparts, and tarsi reddish brown, remaining parts of legs brown. Dorsal pubescence consisting of very short and thin yellowish setae. Plastron present in anterior portions of frontoclypeus, along lateral elytral edge in posterior half, and entire ventral surface except prosternal process, median part of metaventrite, and narrow area along posterior edge of ventrite 5.

Dorsal cranial surface with coarse setiferous punctures, each approximately as wide as eye facet, separated by 0.5–1.0 × puncture diameter; plastron in anterior portions of frontoclypeus, reaching above antennal insertions. Labrum transverse, anterior margin weakly emarginate, exposed portion microreticulate, setae concentrated along anterior margin, equal in length in both sexes. Eyes oval, weakly protruding, ID: ♂♂ 0.51–0.57 mm (0.55± 0.02, n =8), ♀♀ 0.55–0.61 mm (0.58± 0.01, n= 8). Antennae short, 10-segmented, densely setose.

Pronotum transverse, moderately convex, widest at base, PW/PL: ♂♂ 1.88–2.06 (1.97 ±0.05, n= 8), ♀♀ 1.92–2.09 (1.99 ±0.06, n=8); surface smooth, with round setiferous punctures; anterior angles protruding, deflexed; lateral sides convergent, weakly rounded. Prosternal process with lateral and posterior edges rounded; lateral portions weakly raised, without clusters of long setae; median keel arcuate. Scutellum slightly longer than wide, with several round punctures. Metaventral disc weakly convex, without clusters of long setae. Elytra oval, widest between first and second thirds, EL/EW: ♂♂ 1.48–1.55 (1.51 ±0.02, n=8), ♀♀ 1.46–1.57 (1.51 ± 0.04, n =8); surface very weakly microreticulate, with scattered round punctures; plastron present in posterior half in narrow bands along lateral edges. Tibiae weakly curved, protibia ca 1.5× as long as protarsus; PrTL/PL: ♂♂ 0.99–1.10 (1.04± 0.04, n= 8), ♀♀ 0.82–1.12 (1.03± 0.09, n=8). Terminal protarsomere as long as three preceding segments combined.

Ventrites covered with plastron, except on median area before apex of ventrite 5, which extends laterad along posterior edge. Ventrite 5 weakly emarginate at apex in males, rounded at apex, with short longitudinal keel in females.

Aedeagus ( Fig. 99 ): phallobase short, PhL/PrL: 1.16–1.27 (1.22 ±0.04, n =8); parameres relatively long, moderately bent ventrad in distal half, apices narrowly rounded (lateral aspect); penis narrowly rounded at apex, reaching two-thirds of parameral length; sclerotised fibula present. Bursa copulatrix ( Fig. 106B ) with numerous microsclerites.

Secondary sexual dimorphism

Ventrite 5 in males weakly emarginate at apex, in female rounded at apex, with short longitudinal keel.

Distribution

Vietnam ( Fig. 115D ).

Figures

Fig. 98. Elmomorphus oblongus sp. nov., holotype, male (NMW), TL: 3.35 mm.

Fig. 99. Elmomorphus oblongus sp. nov., holotype (NMW), aedeagus. A. Lateral aspect. B. Ventral aspect. Scale bar: 0.1 mm.

Fig. 106. Bursa copulatrix and vagina. A. Elmomorphus hamatus sp. nov., paratype from type locality (NMW). B. E. oblongus sp. nov., paratype from type locality (NMW). C. E. glabriclunis sp. nov., paratype from China, locality CWBS 258 (CKB). D. E. simplex sp. nov., paratype from type locality (CKB). E. E. comosiclunis sp. nov., paratype from China, locality CWBS 468. Scale bar: 0.1 mm.

Fig. 115. Distribution maps.A. Elmomorphus reticulatus sp. nov.B. E. superficialis sp. nov.C. E. hamatus sp. nov. D. E. oblongus sp. nov. E. E. glabriclunis sp. nov. F. E. simplex sp. nov.