Elmomorphus dentipes, 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 : 144-149

Elmomorphus dentipes sp. nov.

urn:lsid:zoobank.org:act:DEBDB95A-9133-42F0-B76C-87DD5B625F93

Figs 70–71 , 74B , 107B , 113B

Differential diagnosis

Elmomorphus dentipes sp. nov. ( Fig. 70 ) belongs to the group of species characterised by having the dorsal plastron on anterior portions of the head and the posterolateral portions of the elytra. Elytral punctures are scattered over the entire surface, striae are absent. Males bear conspicuous long erect setae or setal clusters on the labrum, prosternal process, and metaventrite; the disc of their metaventrite is depressed, and the mesal face of the metatibia has a conspicuous tooth near the middle. Elmomorphus dentipes most closely resembles E. curvipes sp. nov. and E. similis sp. nov., from which it can be distinguished by the metatibia being nearly straight in both sexes and by the male mesotibia not expanded in the distal half ( Fig. 70 ). The parameres are evenly narrowed, with apices very narrowly rounded ( Fig.71 ) in E. dentipes , but distinctly sinuate with broadly rounded apices in E. similis ( Fig. 69 ). The bursa copulatrix has a distinct dorsal row of spines and with several spines scattered over the lateral portions in E. dentipes ( Fig. 74B ). In E. similis the spines are scattered over the dorsal and lateral portions, and not arranged in a distinct dorsal row ( Fig. 74A ). In E. curvipes , the spines are arranged in a distinct dorsal row but absent in lateral portions ( Fig. 74C ). Elmomorphus dentipes also closely resembles E. simplipes sp. nov., from which it can be distinguished by the metatibial tooth. The spines on the bursa copulatrix in E. dentipes are always arranged in a distinct dorsal row ( Fig. 74B ), while in E. simplipes , the spines are scattered over the dorsal parts and only sometimes form an indistinct dorsal row ( Fig. 67A ).

Etymology

The epithet, an adjective (nominative singular), is a combination of the Latin words ‘dens’ (‘tooth’) and ‘pes’ (‘foot, leg’). It refers to the tooth on the male metatibia.

Type material

Holotype

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

Paratypes

VIETNAM – Lam Dong Province • 64 ♂♂, 76 ♀♀; same collection data as for holotype; CKB, NMW. – Thanh Hóa Province • 4 ♂♂; “ VIETNAM, Thanh Hóa Prov., Bá Thước Distr., Thành SƠn , 20°30′01.4″N, 105°06′19.3″E, 467 m a.s.l., 15.11.2022, Kodada & Selnekovič leg. (10)”; CKB .

Additional material examined

CHINA – Yunnan Province • 53 ♂♂, 4 ♀♀; “CHINA: Yünnan, Xishuangbanna , ca. 15km W Menglun 5.11.1999, ca. 700 - 800m leg. Jäch, et al. (CWBS 354)”; NMW • 1 ♂; “ CHINA: Yünnan, Xishuangbanna ca. 3km S Menglun, 6.11.1999, ca. 500m, leg. Jäch et al. (CWBS 357)”; NMW • 9 ♂♂, 5 ♀♀; “ CHINA: Yünnan, Xishuangbanna ca. 10km NW Menglun 7.11.1999, ca. 700m leg. Jäch, et al. (CWBS 359)”; NMW • 11 ♂♂, 5 ♀♀; “ CHINA: Yünnan, Xishuangbanna ca. 10km NW Menglun 7.11.1999, ca. 700 - 800 m leg. Jäch, et al. (CWBS 360)”; NMW • 1 ♀; “ CHINA: Yünnan, Xishuangbanna ca. 50km SSE Menglun, Mengyüan 8.11.1999, ca. 700m leg. Jäch et al. (CWBS 361)”; NMW • 1 ♀; “ CHINA: Yünnan, Xishuangbanna ca. 50km SSE Menglun, Mengyüan 8.11.1999, ca. 700m, leg. Jäch et al. (CWBS 362)”; NMW • 3 ♂♂; “ CHINA: Yünnan, Xishuangbanna ca. 6km NW Mengla 8.11.1999, ca. 700m leg. Jäch, et al. (CWBS 364)”; NMW • 15 ♂♂; “ CHINA: Yünnan, Xishuangbanna ca. 6km NW Mengla 8.11.1999, ca. 700m leg. Jäch, et al. (CWBS 365)”; NMW • 44 ♂♂, 20 ♀♀; “ CHINA: Yünnan, Xishuangbanna ca. 6km NW Mengla 9.11.1999, ca. 700m leg. Jäch, et al. (CWBS 367)”; NMW • 27 ♂♂, 23 ♀♀; “ CHINA: Yünnan, Xishuangbanna ca. 20km NW Mengla 9.11.1999, ca. 1000 m leg. Jäch, et al. (CWBS 368)”; NMW • 5 ♂♂; “ CHINA: Yünnan, Xishuangbanna , ca. 50km NW Mengla, 9.11.1999, ca. 800m leg. Wang & Wei (CWBS 370)”; NMW • 12 ♂♂, 11 ♀♀; “ CHINA: Yünnan, Xishuangbanna ca. 35km NW Menglun 10.11.1999 ca. 1100m leg. Jäch, et al. (CWBS 371)”; NMW • 2 ♂♂; “ CHINA: Yünnan, Xishuangbanna ca. 7km NE Jinghong 12.11.1999, ca. 600m leg. Jäch, et al. (CWBS 377)”; NMW • 18 ♂♂, 13 ♀♀; “ CHINA: Yünnan, Xishuangbanna, pass betw. Jinghong – Mengyang 12.11.1999, ca. 1100m leg. Jäch, et al. (CWBS 379)”; NMW • 3 ♂♂; “ CHINA: Yünnan, Simao Pref. 36km SW Simao, Jian Shan Riv. 15.11.1999, ca. 1000m Schönmann & Wang (CWBS 388)”; NMW • 4 ♂♂, 2 ♀♀; “ CHINA: Yünnan, Simao Pref. 35km S Simao, Zhu Shan, 16.11.1999, Caiyang Riv. NR ca. 1100m Schönmann & Wang (CWBS 390)”; NMW • 42 ♂♂, 32 ♀♀; “ CHINA: Yünnan, Simao Pref. 25km SW Simao, Zhu Shan, 17.11.1999, ca. 1000m Schönmann & Wang (CWBS 392)”; NMW • 10 ♂♂, 10 ♀♀; “ CHINA: Yünnan, Simao Pref. 25km SW Simao, Zhu Shan, 17.11.1999, ca. 1000m Schönmann & Wang (CWBS 393)”; NMW • 1 ♂, 3 ♀♀; “ CHINA: Yünnan, Simao Pref. 35km SW Mojiang 19.11.1999, ca. 1000m Schönmann & Wang (CWBS 394)”; NMW • 14 ♂♂, 20 ♀♀; “ CHINA: Yünnan, Simao Pref. 35km SW Mojiang, 19.11.1999 ca. 1000m Schönmann & Wang (CWBS 395)”; NMW • 10 ♂♂, 2 ♀♀; “ CHINA: Yünnan, Gejiu Pref. 30km S Gejiu, Tian Ba Shi env. 23.11.1999, ca. 1300m Schönmann & Wang (CWBS 400)”; NMW • 1 ♂; “ CHINA: Yünnan, Gejiu Pref. 30km S Gejiu, Tia Ba Shi env. 23.11.1999, ca. 1300m, Schönmann & Wang (CWBS 401)”; NMW • 2 ♂♂, 5 ♀♀; “ CHINA: Yünnan, Chuxiong Pref. Da Shui Go riv. nr. Ban Jiu, 10km N Yipinglang 27.11.1999, ca. 1700m, Schönmann & Wang (CWBS 409)”; NMW .

LAOS – Champasak Province • 1 ♂; “S-LAOS: Prov. Champasak W Muang Paksong, 900m Ban Itou Wf. [waterfall] 28.5.1996 leg. Schillhammer (10)”; NMW . – Luang Namtha Province • 1 ♀; “N-LAOS: Prov. Lg. Nam Tha, ca. 20 km NE Muang Sing 10.6. 1996, 700 m leg. Schillhammer (20)”; NMW • 1 ♀; “N-LAOS: Prov. Lg. Nam Tha, ca. 5 km S Muang Sing 650 m Huay Giulom riv., 10.6.1996 leg. Schillhammer (21)”; NMW • 17 ♂♂, 19 ♀♀; “N-LAOS: Prov. Lg. Nam Tha ca. 20km SE Muang Sing 12./ 13.6.1996 950m leg. Schillhammer (25)”; NMW • 1 ♂; “N-LAOS: Prov. Lg. Nam Tha ca. 30km NW Lg. Nam Tha 16./ 18.6.1996 800 m leg. Schillhammer (28, 30)”; NMW .

MYANMAR • 14 ex.; “MYANMAR: Shan State ca. 300 m below Ye Ayegan reservoir leg. H. Shillhammer, U Myint Hlaing, U Aung Moe, 9.6.[20]02 ( MBS 84 ) ǀ small right tributary to main stream 20°36.274′N 96°32.055′E ”; NMW • 9 ex.; “ MYANMAR: Shan State ca. 40 km N Aungban above Ale Chaung village leg. H. Schillhammer, U Myint Hlaing, U Aung Moe, 10.6.[20]02 ( MBS 85 ) ǀ Waboe stream, furcating stretch, ca. 1540 m 20°59.80′N 96°34.69′E ”; NMW • 2 ex.; “ MYANMAR: Shan State Main Thouk Forest Monastery, 4.6.[20]04 leg. H. Schillhammer, H. Shaverdo, U Myint Hlaing ( MBS 136 /136a) ǀ stream in primary forest pools along stream & downstream in dried out stream bed”; NMW • 7 ex.; “ MYANMAR: Shan State ca. 5 km SW Kalaw Ye Aygan , 9.6. [20]04 leg. H. Schillhammer, H. Shaverdo, U Myint Hlaing ( MBS 143 c) ǀ small stream, trib. of main str., ca. 1340 m 20°36.274′N 96°32.055′E ”; NMW .

THAILAND – Chiang Mai Province • 1 ♂; “THAILAND: 30./31.11. Chiang Mai Prov. 1995 W Mae Rim, Mae Sa NP [National Park] leg. Zettel (2)”; NMW • 1 ♂; “ THAILAND: 1.11.1995 Chiang Mai Prov. Doi Suthep , 900m leg. Zettel (3)”; NMW • 7 ♂♂, 8 ♀♀; “ THAILAND: 2.11.1995 Chiang Mai Prov. Doi Suthep , 750-800m leg. Zettel (4)”; NMW • 3 ♂♂, 3 ♀♀; “ THAILAND: 5.11.1995 Chiang Mai Prov. 900-1100m Doi Suthep NP leg. Zettel (7)”; NMW • 2 ♂♂, 10 ♀♀; “ Thailand: Chang Mai, Doi Sutep Nat. Park , 24.III.1994 Monthatarh [Monthatan] Falls, A-1043, W.D.S. Shepard leg.”; CSS • 1 ♂, 5 ♀♀; “ Thailand: Chiang Mai, Doi Sutep Nat. Park , 24.III.1994 Monthatarh [Monthatan] Falls, A-1044, W.D.S. Shepard leg.”; CSS • 1 ♂; “ Thailand: Chiang Mai, Doi Sutep Nat. Park , 24.III.1994 Monthatarh [Monthatan] Falls,A-1045, W.D.S. Shepard leg.”; CSS • 8 ♂♂, 5 ♀♀; “ THAILAND, 11.3.1992 18°48′N 98°55′E Doi Suthep , 1200m leg. Malicky (SS 16)”; CKB, NMW • 1 ♂, 1 ♀; “ Thailand: Chiang Mai Prov., Doi Inthanon Huai Pha Tang stream, 1300 m, 16.1.2009 leg. H. Zettel & S. Silalom (62)”; NMW • 4 ex.; “N-THAILAND Ban Sanpakia 19° 19′ N 98° 50′ E, 1000 m a.s.l., 3.V.1998, V. Kubáň leg.”; CKB. – Mae Hong Son Province • 1 ex.; “ THAILAND: 12.11.1995 12 km S Mae Hong Son , Pha Bong leg. Zettel (13a)”; NMW. – Nan Province • 1 ♂, 1 ♀; “N- THAILAND: Nan, 3.1.1999 Doi Phu Ka NP, 1400 m nr. Huai Nam Dan vill. leg. P. Mazzoldi (26)”; NMW .

Type locality

Vietnam, Lam Dong Province, 12 km north of Da Lat, Lang Bian.

Description

Measurements (mm): TL: ♂♂ 2.67–3.32 (2.89 ± 0.14, n =64), ♀♀ 2.71–3.37 (3.03 ± 0.15, n=38); PL: ♂♂ 0.60–0.76 (0.67 ± 0.04, n =64), ♀♀ 0.62–0.76 (0.69± 0.04, n=38); PW: ♂♂ 1.15–1.43 (1.24 ± 0.07, n =64), ♀♀ 1.18–1.50 (1.30 ±0.08, n =38); EL: ♂♂ 2.00–2.57 (2.22± 0.10, n =64), ♀♀ 2.08–2.60 (2.34 ± 0.11, n=38); EW: ♂♂ 1.35–1.69 (1.50± 0.08, n=64), ♀♀ 1.43–1.75 (1.56± 0.08, n= 38); PhL: 0.83–1.01 (0.90 ± 0.04, n=64); PrL: 0.48–0.60 (0.54 ± 0.02, n=64).

Body ovate, moderately convex dorsally ( Fig. 70 ). Integument dark brown to black; mouthparts, antennae, and legs dark reddish brown. Pubescence consisting of very short sparse yellowish setae. Plastron present on anterior portions of head, apicolateral portions of elytra, and on the ventral surface except prosternal process, median part of metaventrite, and middle of ventrites 1–2.

Head with round setiferous punctures, slightly smaller than an eye facet, separated by 1.0–1.5 × puncture diameter; plastron present on frontoclypeus. Labrum wider than long, anterior margin slightly rounded; dorsal surface microreticulate, with minute round setiferous punctures; males with conspicuous long setae. Anterior margin of clypeus straight. Antennae 9-segmented. Eyes oval, interfacetal setae short; ID: ♂♂ 0.32–0.56 mm (0.42 mm ± 0.03, n=64), ♀♀ 0.41–0.51 mm (0.46 mm ± 0.02, n =38); APD/ ID: ♂♂ 1.33–2.52 (1.75± 0.12, n=64), ♀♀ 1.60–1.80 (1.69± 0.04, n=38).

Pronotum wider than long, widest at base, PW/PL: ♂♂ 1.73–2.05 (1.85± 0.07, n=64), ♀♀ 1.74–2.07 (1.90 ± 0.08, n=38); surface with round setiferous punctures; microreticulation absent; plastron absent; rim of anterior margin as wide as three eye facets, interrupted in middle; lateral sides convergent, straight. Prosternal process with lateral margins straight, divergent, posterior margin broadly V-shaped; lateral portions raised, in males with long setae anteriorly; median keel rather flat. Scutellum longer than wide, smooth, with small punctures. Metaventrite with median area without plastron posteriorly widened, in males slightly depressed, with one pair of setal clusters; lateral margins of metaventral process raised, discrimen rather indistinct. Elytra ovate, strongly convex, widest close behind middle, EL/EW: ♂♂ 1.34–1.59 (1.48± 0.05, n =64); ♀♀ 1.42–1.57 (1.50± 0.03, n=38); surface with very fine microreticulation formed by irregular polygonal meshes; plastron present on epipleura and on apicolateral portions. Pro- and mesotibia straight, not abruptly expanded in distal half; metatibia slightly curved, in males with small tooth on apical third; PrTL/PL: ♂♂ 1.05–1.25 (1.15± 0.04, n= 64), ♀♀ 0.97–1.15 (1.06± 0.05, n =38). Protarsus ca 0.70 × as long as protibia; terminal protarsomere as long as three preceding tarsomeres combined.

Abdominal plastron lacking on middle of ventrites 1–2. Ventrite 5 with short longitudinal keel before apex; apical margin in females triangularly excised in middle. Aedeagus ( Fig. 71 ): phallobase rather robust, expanded proximally, PhL/PrL: 1.37–1.84 (1.68 ±0.09, n=64); parameres evenly narrowed to apices, moderately curved ventrad, apices narrowly rounded in lateral aspect; penis narrowly rounded apically in dorsal aspect, very slightly expanded and rounded in lateral aspect. Ovipositor: valvifers long and flattened, 1.50–1.90 × as long as right coxite; coxites asymmetrical, right one ca 1.30 × as long as left one. Bursa copulatrix ( Fig. 74B ) with sclerotised spines forming a distinct dorsal row, and with a group of several scattered lateral spines; spermatheca tubular with accessory gland.

Secondary sexual dimorphism

Males with long setae on labrum, on lateral portions of prosternal process, and on disc of metaventrite; metatibia toothed. Apical margin of ventrite 5 in females with small median triangular excision.

Distribution

China (Yunnan), Laos, Myanmar, Thailand, Vietnam ( Fig. 113B ).

Figures

Fig. 70. Elmomorphus dentipes sp. nov., paratype, male from type locality (NMW), TL: 2.90 mm.

Fig. 71. Elmomorphus dentipes sp. nov., paratype from type locality (NMW), aedeagus. A. Lateral aspect. B. Ventral aspect. Scale bar: 0.1 mm.

Fig. 74. Bursa copulatrix and vagina. A. Elmomorphus similis sp. nov., specimen from China, locality CWBS 378 (NMW). B. E. dentipes sp. nov., specimen from China, locality CWBS 354 (NMW). C. E. curvipes sp. nov., specimen from China, locality CWBS 260 (NMW). Scale bar: 0.1 mm.

Fig. 107. Habitats of selected species of Elmomorphus Sharp, 1888. A. Vietnam, Phong Mỹ, Sông Ô Lâu River (16°31′15.3″ N, 107°15′00.3″ E); E. striatellus Delève, 1968 and E. siamensis Kodada, Selnekovič & Jäch sp. nov. were found in clumps of leaves and on rootlets of Neptunia sp. B. Vietnam, Thành SƠn (20°30′01.4″ N, 105°06′19.3″ E); E. dentipes sp. nov., and E. similis sp. nov. were found in clumps of leaves.C. Vietnam, ThànhSƠn,Kho Mường(20°28′51.3″N,105°07′51.6″E); E. paramontanus Kodada, Selnekovič & Jäch sp. nov., E. similis sp. nov., and E. cf. sulcatus were found on submerged rootlets of bamboo and banana trees. D. Same locality, showing submerged rootlets. E. Vietnam, Trung Mỹ (21°23′35.3″N, 105°42′52.7″E); E. cf. sulcatus was found in clumps of leaves and on submerged rootlets of bamboo, Bauhinia sp., and Sterculia lanceolata Cav. F. Same locality, clump of leaves and partly submerged rootlets.

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. 69. Elmomorphus similis sp. nov., specimen from China, locality CWBS 354 (CKB), aedeagus. A. Lateral aspect. B. Ventral aspect. Scale bar: 0.1 mm.

Fig. 67. Bursa copulatrix and vagina. A. Elmomorphus simplipes sp. nov., paratype from type locality (CKB).B. E. donatus Kodada, Selnekovič & Jäch sp. nov., holotype (NMW), lateral aspect. C. E. donatus, holotype (NMW), ventral aspect. D. E. paradonatus sp. nov., holotype (IAECAS). Scale bar: 0.1 mm.