Elmomorphus glabriclunis, 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 : 203-205

Elmomorphus glabriclunis sp. nov.

urn:lsid:zoobank.org:act:97854318-7333-4566-90A6-D1CADF579AE4

Figs 100–101 , 106C , 115E

Differential diagnosis

Elmomorphus glabriclunis sp. nov. ( Fig. 100 ) is characterised by having a strongly convex body and the dorsal plastron confined only to small areas around the antennal insertions. Elytral striae are absent, and ventrite 1 is entirely covered with plastron. This species strongly resembles E. simplex sp. nov. and E. comosiclunis sp. nov., but it differs from both in the ventrite 5, which is strongly convex anteriorly and deflexed posteriorly with a sizeable median area without plastron. In E. simplex , ventrite 5 is evenly convex, and the area lacking plastron along the posterior margin is narrow. In E. comosiclunis , ventrite 5 is simple and evenly convex in females, while males have a large flat oval area with remarkably long setae.

Etymology

The epithet, a noun (nominative singular) in apposition, is a combination of the Latin words ‘glaber’ (‘glabrous’) and ‘clunis’ (‘rump’). It refers to the glabrous area on ventrite 5.

Type material

Holotype

CHINA – Hong Kong • ♂; “ HONGKONG leg. Dudgeon [printed] | Tai Po Kau 19.1.1978 K [handwritten by M.A. Jäch]”; NMW.

Paratypes

CHINA – Hong Kong • 2 ex.; “HONGKONG 1977-1979 Benthic Coll. Tai Po Kau leg. Dudgeon ”; NMW • 1 ♂; “ HONGKONG Tai Po Kau 2.11.1978 leg. Dudgeon ( K)”; NMW • 1 ex.; “ Tai Po Kau riv. 27.IV.1978 K5 | HONGKONG leg. Dudgeon ”; NMW • 1 ex.; “ HONGKONG Tai Po Kau 9.3.1978 leg. Dudgeon ( K)”; NMW • 1 ex.; “ HONGKONG Tai Po Kau 2.1.1979 leg. Dudgeon (3)”; NMW • 1 ex.; “ HONGKONG Tai Po Kau 28.7.1983 leg. Dudgeon (upstr.)”; NMW • 1 ex.; “ HONGKONG, Tai Po Kau 12.- 13.4.1984 leg. Dudgeon (contr.)”; NMW • 2 ex.; “ HONGKONG (3) [CWBS 4] 1992 N.T.- Plover C. [ove] Res.[ervoire] 25.VI. leg. Jäch ”; NMW • 1 ♂; “ HONGKONG (7) [CWBS 8] 1992 N.T.- Tai Po N.Res. 27.VI. leg. Jäch”; NMW. – Fujian Province • 1 ex.; “ CHINA: FUJIAN, Yong’an , 5 km SW Xiyang, 550 m Ziyungdong Shan, 25. 1. 1997, leg. Ji & Wang ( CWBS 256)”; NMW • 1 ♂, 1 ♀; “ CHINA: FUJIAN, Longyan Jiangshan (20 km N Longyan) Keshan monastery, 900 m Meihua Shan, 28.1.1997 leg. H. Schönmann ( CWBS 260)”; NMW • 3 ♂♂, 6 ♀♀; “ CHINA: FUJIAN, Longyan Shizong, Shangfang Shan 850m 31.1.1997 leg. Ji & Wang ( CWBS 264)”; CKB, NMW • 5 ♂♂, 3 ♀♀; “ CHINA: Fujian , Yong’an 5 km N Xiyang, 400m 26.1.1997 leg. Ji & Wang ( CWBS 258)”; CKB, NMW. – Guangdong Province • 1 ex.; “ CHINA: Guangdong Prov. 50 km E Fengkai 23°27′36″N 111°54′36″E 31.10./ 2.11.2001, ca. 150 m Jäch & Komarek ( CWBS 455)”; NMW • 1 ♂, 4 ♀♀; “ CHINA: Guangdong Prov. 50 km E Fengkai 23°27′04″N 111°53′53″E 1.11.2001, ca. 300-400 m Jäch & Komarek ( CWBS 456)”; NMW • 1 ex.; “ CHINA: Guangdong Prov. 60 km E Fengkai 23°26′38″N 111°58′10″E 1.11.2001, ca. 230 m Jäch & Komarek ( CWBS 458)”; NMW • 2 ♂♂, 1 ♀; “ CHINA: Guangdong Prov. 45 km N Zengcheng 23°37′28″N 113°50′10″E 13.11.2001, ca. 500 m leg. M. Wang ( CWBS 495)”; NMW • 1 ♂, 1 ♀; “ CHINA: GUANGDONG Prov. W of Qixing, 1–3.v.2011 HEISHIDING nature reserve (forested stream valley; at light) 23°27.9′N, 111°54.3′E, 190 m M. Fikáček & J. Hájek leg.”; NMPC. – Guangxi Autonomous Region • 8 ex.; “ CHINA: SE-Guangxi, Distr. Yulin , Liuwan Mts. SW Yulin | 18.11.1993 300m leg. Schönmann (23) [CWBS 45]”; CKB, NMW • 2 ex.; same collection data as for preceding, but “leg. Schillhammer ”; NMW • 1 ex.; same collection data as for preceding, but “leg. L. JI”; NMW • 11 ♂♂, 11 ♀♀; “ CHINA SE-Guangxi Distr. Yulin Liuwan Mts. SW Yulin | 20.11.1993 120m (26) [CWBS 49] leg. Schönmann ”; CKB, NMW • 7 ex.; “ CHINA, SE-Guangxi Distr. Yulin Liuwan Mts. SW Yulin | 17.11.1993 Kuishan , 600-700m leg. L. Ji (21) [CWBS 43]”; NMW • 2 ex.; same collection data as for preceding, but “leg. Schillhammer ”; CKB, NMW • 5 ex.; same collection data as for preceding, but “leg. L. JI ”; NMW • 7 ex.; “ CHINA SE-Guangxi Distr. Yulin Liuwan Mts. SW Yulin | 16.11.1993 350-400m leg. Schönmann (20) [CWBS 42]”; NMW • 3 ex.: same collection data as for preceding, but “leg. Schillhammer ”; NMW • 1 ♂, 2 ♀♀; “ CHINA SE-Guangxi Distr. Yulin Liuwan Mts. SW Yulin | 18.11.1993 200m, (24) [CWBS 46] leg. Schönmann ”; NMW • 1 ♀: “ CHINA SE-Guangxi Distr. Yulin Liuwan Mts. SW Yulin | 17.11.1993 Kuishan , 300m leg. Schönmann (22) [CWBS 44]”; NMW .

Type locality

China, Hong Kong Special Administrative Region, New Territories, Tai Po Kau Nature Reserve.

Description

Measurements (mm): TL: ♂♂ 3.14–3.63 (3.39± 0.11, n=15), ♀♀ 3.36–3.70 (3.50 ±0.12, n=10); PL: ♂♂ 0.67–0.81 (0.73 ± 0.04, n= 15), ♀♀ 0.69–0.81 (0.73 ±0.03, n=10); PW: ♂♂ 1.52–1.69 (1.60± 0.05, n= 15), ♀♀ 1.52–1.79 (1.65± 0.08, n =10); EL: ♂♂ 2.47–2.93 (2.66 ± 0.10, n=15), ♀♀ 2.63–2.97 (2.77 ± 0.11, n =10); EW: ♂♂ 1.79–2.02 (1.90± 0.06, n =15), ♀♀ 1.80–2.02 (1.95± 0.08, n =10); PhL: 0.53–0.61 (0.56± 0.02, n =15); PrL: 0.40–0.48 (0.43± 0.02, n= 15).

Body oval, moderately convex dorsally ( Fig. 101 ). Integument black; mouthparts, antennae, and legs reddish brown. Pubescence yellowish. Plastron on dorsum confined to an area around antennal insertions; ventral plastron present on entire surface, except on prosternal process, median part of metaventrite, and median part of terminal ventrite.

Head smooth with round punctures slightly smaller than an eye facet, puncture distance 0.5–1.0 × diameter. Labrum microreticulate on exposed portion, with small setiferous punctures; setae equal in length in both sexes; anterior margin finely emarginate. Eyes oval, interfacetal setae short. Antennae 10-segmented, densely setose.

Pronotum moderately convex; PW/PL: ♂♂ 2.06–2.34 (2.21± 0.09, n=15), ♀♀ 2.10–2.46 (2.26 ± 0.13, n= 10); rim of anterior margin as wide as 2–3 eye facets, interrupted in middle; anterior angles strongly deflexed, prominent; lateral pronotal sides convergent, rounded; surface smooth, with round setiferous punctures. Prosternal process with lateral edges straight, posterior edge rounded, lateral portions moderately raised, without groups of long setae, median keel arcuate. Scutellum wider than long, smooth, with minute punctures. Median part of metaventrite slightly convex, posteriorly widened; groups of long setae absent in both sexes; lateral margins of metaventral process raised. Elytra oval, moderately convex, widest before middle, EL/EW: ♂♂ 1.30–1.50 (1.40± 0.06, n =15), ♀♀ 1.38–1.48 (1.42± 0.04, n= 10); surface microreticulate, with scattered round punctures. Tibiae slightly curved, protibia ca 1.6× as long as protarsus; PrTL/PL: ♂♂ 1.02–1.19 (1.11 ± 0.05, n=15), ♀♀ 0.96–1.21 (1.09± 0.08, n =10). Terminal protarsomere as long as three preceding tarsomeres combined.

Abdomen covered with plastron, except on sizeable oval area on ventrite 5. Ventrite 1 with two longitudinal keels medially. Ventrite 5 with short longitudinal keel before apex in females. Aedeagus ( Fig. 101 ): phallobase slightly expanded basally, PhL/PrL: 1.13–1.51 (1.29± 0.09, n= 14); parameres rather long and narrow, curved ventrad in apical half, apices rounded (lateral aspect); penis apically narrowly rounded; sclerotised fibula slender. Bursa copulatrix ( Fig. 106C ) with several microsclerites located laterally in proximal portion.

Secondary sexual dimorphism

Ventrite 5 in females with short longitudinal keel before apex.

Distribution

China (Fujian, Guangdong, Guangxi, Hong Kong) ( Fig. 115E ).

Figures

Fig. 100. Elmomorphus glabriclunis sp. nov., paratype, male from China, locality CWBS 49 (CKB), TL: 3.39 mm.

Fig. 101. Elmomorphus glabriclunis sp. nov., paratype from China, locality CWBS 49 (CKB), 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.