Elmomorphus sausai Kodada, Selnekovič & Jäch, 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 : 104-108

Elmomorphus sausai Kodada, Selnekovič & Jäch sp. nov.

urn:lsid:zoobank.org:act:2E012F42-870B-44CA-9A59-CF591E6D6517

Figs 48– 49 , 111E

Differential diagnosis

Elmomorphus sausai sp. nov. ( Fig. 48 ) is characterised by the presence of a plastron on the dorsal cranial surface (except for a small triangular area on the vertex) and on the lateral sides of the pronotum and elytra. Elytral punctures are scattered over the entire surface, and longitudinal striae are absent. These characters are shared by E. bispinosus sp. nov., E. longitarsis sp. nov., E. umphangicus sp. nov., and E. yunnanensis sp. nov. The elytral plastron band covers about two-thirds of the elytron width (measured at the elytral midlength), in contrast to the species mentioned above, which possess plastron bands covering only half of the elytron width or less. The body outline is broadest around the elytral midlength, whereas in E. umphangicus sp. nov., it is the widest behind the elytral midlength. Pronotum and elytra are black with a light bronze metallic lustre. Aedeagus as in Fig. 49 .

Etymology

This species is named in honour of Ondrej Šauša, a Slovak entomologist who collected the holotype.

Type locality

Vietnam, Yên Bái Province, Yên Bái.

Type material

Holotype

VIETNAM – Yên Bái Province • ♂; “Vietnam North YEN BAI 6.- 25.5.1990 O. Sausa lgt.”; NMW.

Paratypes

VIETNAM – Yên Bái Province • 2 ♂♂, 4 ♀♀; same collection data as for holotype; CKB • 1 ♂, 1 ♀; “ Vietnam bor. Pr. Hoang lien son YEN BAI V. 1990 J. Picka lgt.”; NMW • 1 ex.; “N VIET NAM (Tonkin) Pr. Hoang Lien Son YEN BAI 10.V.1990 Vít. Kubáň leg.”; NMW .

Description

Dimensions (mm):TL: ♂♂ 3.07–3.15(3.10 ± 0.03,n =4), ♀♀ 3.15–3.28(3.21± 0.05,n =5);PL: ♂♂ 0.68– 0.74 (0.70± 0.03, n= 4), ♀♀ 0.71–0.74 (0.72 ± 0.01, n=5); PW: ♂♂ 1.26–1.31 (1.28± 0.02, n=5), ♀♀ 1.30–1.38 (1.33 ±0.03, n=4); EL: ♂♂ 2.37–2.41 (2.40 ± 0.02, n= 4), ♀♀ 2.44–2.57 (2.49± 0.05, n =5); EW: ♂♂ 1.50–1.53 (1.50± 0.02, n =4), ♀♀ 1.53–1.63 (1.57± 0.04, n=5); PhL: 0.56–0.66 (0.63 ± 0.05, n= 4); PrL: 0.29–0.33 (0.31± 0.02, n= 4).

Body ovate, widest around midlength of elytra, moderately convex dorsally ( Fig. 48 ). Colouration black, mouthparts, antennae, trochanters, proximal portions of femora, and tarsi reddish brown. Pubescence consists of thin short decumbent setae arising from round punctures. Dorsal plastron present on cranial surface (except for triangular area on vertex), and on the lateral sides of pronotum and elytra. Ventral plastron lacking on prosternal process, median part of metaventrite, and middle of ventrites 1–2.

Cranial surface with round setiferous punctures separated by ca 0.5–1.0 × diameter, punctures smaller than eye facets. Plastron on entire cranial surface, except triangular area on vertex. Labrum transverse, anterior margin straight, exposed portion microreticulate with small setiferous punctures; setae concentrated along anterior margin, equal in length in both sexes. Anterior margin of clypeus straight. Eyes large, oval, moderately protruding; ID: ♂♂ 0.41–0.45 mm (0.43± 0.02, n =4), ♀♀ 0.43–0.47 mm (0.45 ± 0.01, n=5). Antennae 10-segmented, densely setose.

Pronotum transverse, moderately convex, widest at base, PW/PL: ♂♂ 1.70–1.87 (1.82 ±0.08, n= 4), ♀♀ 1.77–1.93 (1.85± 0.06, n=5); plastron forming two medially constricted, lateral bands; pronotal disc smooth, with large round setiferous punctures. Anterior pronotal angles strongly deflexed, protruding and acute; lateral sides convergent, weakly rounded. Prosternal process with lateral and posterior edges rounded; lateral portions weakly raised; median keel nearly flat; clusters of long setae absent. Scutellum longer than wide, smooth, with several setiferous punctures. Metaventral process with lateral margins flat; metaventral disc flat; posteriorly expanded median portion smooth, lacking plastron. Elytra ovate, moderately convex, widest around middle, EL/EW: ♂♂ 1.57–1.61 (1.59 ±0.52, n=4), ♀♀ 1.53–1.60 (1.58 ± 0.03, n= 5). Lateral plastron bands wide, posteriorly expanded, each covering about two-thirds of elytron width (measured at elytral midlength); area without plastron smooth, with scattered setiferous punctures. Tibiae straight, PrTL/PL: ♂♂ 1.16–1.23 (1.20± 0.03, n =4), ♀♀ 1.14–1.22 (1.19± 0.03, n= 5). Terminal protarsomere slightly longer than all preceding segments combined. Male and female foreclaws similar, long and strongly curved.

Ventrites covered with plastron, except middle of ventrites 1–2. Intercoxal process with lateral margins slightly raised; admedian keels inapparent. Ventrite 5 in both sexes evenly convex, apex narrowly truncate or emarginate in males and rounded with small longitudinal keel in females. Aedeagus ( Fig. 49 ): phallobase rather long, PhL/PrL: 1.94–2.11 (2.01–0.07, n =4); parameres narrowed and rounded apically, weakly curved (lateral aspect); penis narrowly rounded apically; sclerotised fibula relatively wide.

Secondary sexual dimorphism

Male ventrite 5 narrowly truncate or emarginate in males; rounded and with short longitudinal keel in females.

Distribution

Vietnam ( Fig. 111E ).

Figures

Fig. 48. Elmomorphus sausai Kodada, Selnekovič & Jäch sp. nov., holotype, male (NMW), TL: 3.10 mm.

Fig. 49. Elmomorphus sausai Kodada, Selnekovič & Jäch sp. nov., holotype (NMW), aedeagus. A. Lateral aspect. B. Ventral aspect, detail of parameres and penis. C. Ventral aspect. Scale bars: 0.1 mm.

Fig. 111. Distribution maps. A. Elmomorphus paramontanus Kodada, Selnekovič & Jäch sp. nov. B. E. cuneatus sp. nov. C. E. umphangicus Kodada, Selnekovič & Jäch sp. nov. D. E. parvulus sp. nov. E. E. sausai Kodada, Selnekovič & Jäch sp. nov. F. E. longitarsis sp. nov.