Geoparnus loebli

Kodada, Ján, Kadubec, Michal & Jr, Fedor Čiampor, 2013, Geoparnus loebli, a new species of terrestrial dryopid from Peninsular Malaysia (Coleoptera: Dryopidae), Zootaxa 3646 (1) : -

Geoparnus loebli species nova

Type locality: forest floor debris in a rain forest, Gunung Ulu Kali, Genting Highlands, Pahang, Peninsular Malaysia.

Material examined: Holotype (MNHG) male: “W. Malaysia: Pahang Genting Highlands 1550m, 5.IV.93 Löbl & Calame,?30“. Paratypes (NHMG, CKB): 2 33, 1 Ƥ with same data as holotype; 1 Ƥ: “W. Malaysia: Pahang Genting Highlands 1650m, 5.IV.93 Löbl & Calame,?29“.

Diagnosis. Geoparnus loebli is a larger-sized species (body length 3.1–3.8 mm), differing from Geoparnus setifer in: larger size, ovoid body form, punctures combined with furrows on posterior portion of pronotum, size and form of aedeagus, parameres with numerous pores and ventral sac of aedeagus with densely arranged scale-like structures apically. The second known species Geoparnus rhinoceros differs from G. l o e b l i in: smaller size (1.7–2.5 mm), presence of horn-like process on frontoclypeus of male, large flat-bottomed punctures on head and pronotum, pronotal punctures simple, not combined with furrows, smaller and differently shaped aedeagus, parameres with a few pores as well as ventral sac of aedeagus without scale-like structures.

Description. Habitus of male is shown in Fig. 1 . Body form ovoid, outline distinctly constricted between pronotum and elytra, strongly convex dorsally, very compact and strongly sclerotized; in males 1.64–1.79 (1.78 ± 0.08) and in females 1.64 (invariant) times as long as wide (BL/EW); body length (BL) in males: 3.24–3.82 mm (3.52 ± 0.29), in females: 3.16 and 3.45 mm. Color: pronotum and head dark brown, elytra and legs reddish brown, antennae and mouthparts yellowish.

Vestiture with several types of setae: (a) conspicuous stiff shorter and longer setae with widened multifurcate apex and (b) short and longer hair-like setae; all setae yellowish, some longer stiff setae darker basally. Short hairlike setae adpressed, confined mainly to clypeus, head, pronotum, epipleura, elytra, legs and ventral surface of abdomen, on ventral surface of thorax scarce. Longer hair-like setae concentrated mainly on anterolateral portion of frontoclypeus, cranium near eyes, prosternite, metaventrite and abdominal ventrites. Hair-like setae arising from small narrow sockets; conspicuous stiff setae erect, arising either from small, narrow sockets on elytra, femora, tibiae, terminal tarsomere and pronotum or some arising from larger, deeper punctures on dorsal portion of head and pronotum.

Head. Frontoclypeal area widened anteriorly, anterior margin rounded, edge near antennal insertion slightly raised; surface punctured, punctures about as wide as the diameter of a facet, round, deep, distinctly separated from each other (0.5–2.0 times of the puncture diameter), irregularly spaced; interstices with dense short hair-like setae, glabrous. Compound eyes moderately protruding from head outline, small, with a few hair-like setae. Antennal insertion deep; antenna with scape short, pedicel enlarged, dorsally flat; antennal club moderately longer than scape and pedicel combined, nine segmented.

Thorax. Pronotal disc strongly convex; PL in males 1.03–1.16 mm (1.09 ± 0.07), in females 1.08 and 1.13 mm; PW in males 1.79–2.10 mm (1.94 ± 0.16), in females 1.74 and 1.92 mm; lateral sides arcuate, explanate and crenulate; anterior margin moderately convex, explanate, collar-like; anterior corners deflected, moderately protruding, sharp; posterior margin bisinuate; posterior corners wide, short; punctures similar to that on vertex, on posterior portion denser and combined with distinct longitudinal furrows ( Fig. 2 ). Hypomeron widest posteriorly, ca. 1.5 times as wide as profemur, punctured similarly to vertex; prosternum in front of coxae as long as prosternal process, punctured; prosternal process longer than wide, lateral sides raised and microreticulate, surface moderately raised in midline, punctured, apex subtruncate. Mesoventral cavity deep; meso- and metaventrites very short, combined length shorter than prosternum; metaventral disc deeply impressed, finely sparsely punctured, interstices glabrous, discrimen very fine; metaventral process with sides strongly raised, reticulated; lateral portions of metaventrite with large punctures, interstices with fine reticulation. Elytra convex, without humeri, margin forms edge anteriorly; strongly declivous laterally and posteriorly; lateral sides invisible in dorsal view; apices moderately produced, acute; each elytron with nine rows of large, deeply impressed punctures, punctures about three times as coarse as those on pronotum but less sharp delimited; interstices on central portion usually less than half as wide as puncture diameter, laterally and posteriorly becoming narrower; intervals distinctly narrower than punctures in rows, moderately raised, with rows of stiff erect setae and hair-like setae; anterior margin arcuate; scutellum very small, narrow, subtriangular. Epipleura anteriorly wider than maximum width of profemur, narrowed posteriad, surface finely punctured. EL in males 2.21–2.66 mm (2.42 ± 0.22), in females 2.08 and 2.32 mm; EW in males 1.97–2.13 mm (2.03 ± 0.08), in females 1.92 and 2.10 mm. Hind wings fully absent. Foreleg longest, shorter than body; middle and hind legs slightly shorter; protibia feebly longer than profemur, slightly bent and more thickened in male than in female ( Figs. 3, 4 ); meso- and metatibia similar in form but shorter, both with small ventrodistal projection in male, projection shorter on mesotibia; combined length of protarsomeres and claws moderately exceeds half length of protibia; claws of forelegs similar in both sexes.

Abdominal intercoxal process moderately wider than prosternal process, apex truncate, sides moderately raised; first ventrite in middle slightly longer than second and third ventrites combined, fourth ventrite about half as long as first one and nearly third as long as fifth ventrite; fifth ventrite more rounded, with sides less declivous in male than in female; surface of ventrites with large flat-bottomed punctures and fine punctures on and near intercoxal process, setose. Eight sternite with short median process in male and long in female ( Figs. 10, 11 ); ninth sternite narrow and long in male. Aedeagus ( Figs. 5–7 ): phallobasis robust, subcylindrical, moderately curved, 1.3– 1.5 times as long as parameres, basally wider than apically (lateral view). Parameres long, widest basally, gradually curved ventrad and gradually narrowed toward flattened apices, surface with dense small pores, appears densely punctured. Penis shorter than parameres, narrow, widest basally, gradually narrowed apically, apex nearly acute (ventral view). Membranous ventral sac with dense scale-like structures on apical portion ( Fig. 8 ), reticulated toward base and bearing numerous small spines in apical half, spines arranged in dense longitudinal rows; fibula absent. Ovipositor distinctly longer than abdomen, narrow; valvifer about 1.5 times as long as coxite; bursa copulatrix without sclerotized spinules ( Fig. 9 ).

Sexual dimorphism. Males with protibiae thickened and meso- and metatibiae with small projection, fifth ventrite more rounded and sides less declivous in male than in female.

Distribution. So far known only from the type locality, Genting Highlands, Pahang in Western Malaysia.

Etymology. Named in honour of senior author’s good friend, Ivan Löbl from Genève, an exceptionally good entomologist and fantastic collector of thousands of terrestrial beetles.

Figures

FIGURE 1. Habitus of Geoparnus loebli sp. nov., male.

FIGURES 2 – 4. Geoparnus loebli sp. nov.: 2) surface structure on posterior portion of pronotum, magnification 160 x; 3) female protibia and protarsus, lateral view, magnification 96 x; 4) male protibia and protarsus, lateral view, magnification 96 x.

FIGURES 9 – 11. Geoparnus loebli sp. nov.: 9) ovipositor, lateral view; 10) eighth sternite in male, ventral view; 11) eighth sternite in female, ventral view. Scale = 0.1 mm.

FIGURES 5 – 8. Geoparnus loebli sp. nov.: 5) aedeagus, ventral view; 6) same, dorsal view; 7) same, lateral view; 8) apex of aedeagus, lateral view. Scale = 0.1 mm.