Carpelimus (Trogophloeus) rotundicollis Gildenkov, 2021

Gildenkov, Mikhail Yu., 2021, A new species of the simplex group of the genus Carpelimus Leach, 1819 (Coleoptera: Staphylinidae: Oxytelinae) from Thailand, Zootaxa 4926 (4), pp. 573-576 : 573-575

Carpelimus (Trogophloeus) rotundicollis Gildenkov , sp. n.

( Figs. 1 , 3–4, 7 )

Type material examined: Holotype, ♂: “NW THAILAND Chom Thong 24.-27.iv.1991 Jan Horák leg.” “ SAFE Project Ewers et al. 110223-201b 6017” “ Carpelimus det. 2015 G. de Rougemont ” “ Holotypus Carpelimus rotundicollis | det. M. Gildenkov, 2019” ( MMBC) .

Paratypes, 1 ♂, 12 ♀, 11 unsexed specimens: “NW THAILAND Chom Thong 24.-27.iv.1991 Jan Horák leg.” “ Paratypus Carpelimus rotundicollis | det. M. Gildenkov, 2019” ( MMBC; 1 ♂, 1 ♀, 4 specimens: cMG); 1 ♂: “Nordost-Thailand KhonKaen, ad lucem 25.V.1980. leg. S. Saowakontha ” “ Carpelimus saigonensis (Cameron, 1940) | det. M. Gildenkov, 2012” “ Paratypus Carpelimus rotundicollis | det. M. Gildenkov, 2019”(cMG) .

Description. Measurements of the holotype (male): total length (from base of labrum to apex of abdomen): 1.73; maximum width of head including eyes: 0.36; length of head (from base of labrum to neck constriction along head midline): 0.23; length of antenna: 0.61; longitudinal length of eye: 0.10; length of temple (from posterior margin of eye to neck constriction): 0.03; length of pronotum: 0.30; maximum width of pronotum: 0.40; minimum width of pronotum: 0.23; length of elytra (length of elytra from shoulder to posterior margin): 0.40; maximum width of elytra: 0.46; maximum width of abdomen: 0.44; length of aedeagus: 0.22; length of spermatheca: 0.13.

Bodybrown. Head and abdomen black-brown, pronotum dark brown; elytra and apical antennomeres brown; legs and antennalbases yellow-brown. Body slightly shining, with short, pale pubescence. Habitus as in Fig. 1 .

Head transverse, with wide basal portion. Eyes large, convex, widest between eyes; temples almost indistinct. Surface of head with fine microreticulation. Antennae rather long; antennomeres 1–3 elongate, 4–5 about as wide as long, 6–7 slightly transverse, 8–10 transverse; apical antennomere elongate, conical; three apical antennomeres more massive than preceding segments, forming loose club.

Pronotum widest about 2/3 of its length from base, then narrowed. Lateral sides of pronotum gradually rounded from base. Surface of pronotum with fine microreticulation as that on head. Mediobasal portion of pronotal disc with two small, flattened depressions.

Elytra rather short and wide, approximately as long as wide of pronotum. Punctation fine, dense and rather large; diameter of punctures slightly less than that of ommatidia; distance between punctures significantly shorter than diameter of nearest puncture, interstices between punctures smooth, markedly shining.

Abdomen with fine and smooth microreticulation.

Male. Aedeagusas in Figs. 3–4 .

Female (paratype). Sexualdimorphism not expressed. Spermatheca as in Fig. 7 .

Variability. Insignificant variability was observedin the body size.

Differential diagnosis. The new species belongs to the simplex group, which previously contained seven species ( Gildenkov 2015). Four species are known from Tropical Africa: C. (Trogophloeus) globicollis globicollis (Eppelsheim, 1885) , C. (T.) globicollis grandicollis Gildenkov, 2013 , C. (T.) malgaceus (Fauvel, 1904), C. (T.) collarti (Cameron, 1935) , C. (T.) lisfranci lisfranci (Bernhauer, 1938) and C. (T.) lisfranci seydeli (Cameron, 1952) . Three species are known from the Oriental Region: C. (T.) simplex (Motschulsky, 1857) , C. (T.) saigonensis (Cameron, 1940) and C. (T.) pseudosimplex Gildenkov, 2013 . Based on the general appearance, the new species is most similar to C. saigonensis ( Fig. 2 ), widespread in the Oriental Region, including Thailand ( Gildenkov 2015), but can be distinguished from it by the paler coloration of the body, less developed eyes, more voluminous pronotum ( Figs. 1–2 ), and reliably differs in the morphology of the aedeagus ( Figs. 3–6 ).

Distribution. Thailand.

Etymology. The species epithet is a combination of Latin adjectives rotundus, - a, - um (rounded) and collis, - um, - us (hill). It refers to the shape of the pronotum.

Figures

FIGURES 1–2. Habitus (dorsal view) of Carpelimus: 1–C. (Trogophloeus) rotundicollis sp. n. (holotype); 2–C. (T.) saigonensis (Cameron, 1940) (Vietnam [“S-VIETNAM Nam Cat Tien Nat. Park 1.-15.5.1994, Pacholatko & Dembicky”]). Scale bar: 1.0 mm.

FIGURES 3–7. Carpelimus (Trogophloeus) rotundicollis sp. n., (Figs. 3–4: holotype, Fig. 7: paratype) and C. (T.) saigonensis (Cameron, 1940) (Figs. 5–6: Vietnam [“S-VIETNAM Nam Cat Tien Nat. Park 1.-15.5.1994, Pacholatko & Dembicky”]): 3, 5–aedeagus, ventral view, 4, 6–aedeagus, lateral view, 7–spermatheca. Scale bar: 0.2 mm.