Caenoscelis koreanus Shin, Park, Lee, and Park, 2023

Shin, Joong-In, Park, Sun-Jae, Lee, Seung-Gyu & Park, Jong-Seok, 2023, Taxonomic Review of the Genus Caenoscelis C. G. Thomson (Coleoptera: Cryptophagidae: Cryptophaginae) in Korea with Description of a New Species, The Coleopterists Bulletin 77 (3), pp. 469-476 : 472-474

Caenoscelis koreanus Shin, Park, Lee, and Park , new species

zoobank.org/ urn:lsid:zoobank.org:act:7505F55C-81B8-4946-B957-8C7440846208

( Figs. 1A , 2A , 3A , 5A )

Material Examined (n = 2, 2♂♂). Holotype. 1♂ (card mounted, genitalia and abdomen dissected and mounted on plastic card, NIBR), “HOLOTYPE/ CBNUIC” [red label, printed]; “ Korea: Chungbuk Prov. / Gaesin-dong, Heungdeok-gu,/ Cheongju-si , 24.XI.2020,/ 36°37′43.5′′N 127°27′ 16.7′′E, 75 m,/ sifting soil & leaf litter, J.-I. Shin ” [white label, printed] ; Paratype. 1♂ (slide mounted, CBNUIC), Korea: Jeju Prov. Donmullae-gil, Aewoleup, Jeju-si , 12.I.2022, 33°23′55′′N 126°19′33′′E, 186 m, sifting soil & leaf litter, J.-W. Kang, J.-W. Seo, J.-W. Kim .

Diagnosis. Adult males of this species can be distinguished from other Caenoscelis species by the following combination of characters: antennomere X subquadrate, distinctly wider than IX, dense setae present apically ( Fig. 2A , arrow); antennomere XI slightly longer than X ( Fig. 2A ); pronotum about 1.15–1.20 times as wide as long ( Fig. 3A ); hind wings well developed; parameres subacute, densely punctured, with pair of long apical setae present, bearing three pairs of short setae laterally ( Fig. 5A ); lateral lobes indistinctly separated, pointed apically ( Fig. 5A ), pair of internal sclerites pointed apically ( Fig. 5A , arrow).

Description of Adult Male. Length 1.94–2.04 mm. Body long and narrow, 2.64–2.67 times as long as wide, highly convex, moderately shining, color yellowish brown, antennomeres X–XI, palps, and legs slightly brighter than body ( Fig. 1A ). Dorsal pubescence suberect, length of seta about 0.05–0.09 mm.

Head. Head 1.78–1.80 times as wide as long, densely punctured; diameter of dorsal puncture about 0.011 –0.013 mm, dorsal punctures separated by 0.4–0.8 diameter; eye length about 0.12–0.13 mm, slightly prominent, diameter of facet about 0.014 –0.016 mm; antenna slender, length about 0.88–0.93 mm, antennomere X reaching pronotal base ( Fig. 1A ); antennomere I 1.5 times as long as wide ( Fig. 2A ); antennomere II symmetrical, 1.3 times as long as wide, 0.6–0.7 times shorter than I ( Fig. 2A ); antennomere III symmetrical, slightly shorter and narrower than II ( Fig. 2A ); antennomeres IV–VIII as long as wide, VI and VIII slightly smaller than others ( Fig. 2A ); antennomere VII markedly asymmetrical, inner margin much more convex than outer margin ( Fig. 2A ); antennomere IX 1.7–1.8 times as wide as long ( Fig. 2A ); antennomere X 1.2 times as wide as long, 1.4–1.5 times wider than IX ( Fig. 2A , arrow); antennomere XI as long as wide, 1.1 times longer than X, about 0.85 times narrower than X ( Fig. 2A ).

Thorax. Pronotum 1.17–1.19 times as wide as long, widest slightly behind middle, lateral margin uniformly curved anteriorly and posteriorly, sparsely punctured ( Fig. 3A ); diameter of puncture about 0.014 –0.017 mm, punctures separated by 1.1–1.5 diameter; sublateral lines distinct and complete, moderately separated from lateral margin, divergent from lateral carinae at basal two-thirds ( Fig. 3A ); basal groove shallow and transverse ( Fig. 3A ). Prosternum densely punctured; diameter of puncture about 0.012 –0.017 mm, punctures separated by 0.5–0.9 diameter. Metaventrite sparsely punctured; diameter of puncture about 0.010 –0.015 mm, punctures separated by 1.0–1.5 diameter.

Elytra. Elytra together 1.91–1.93 times as long as wide, 2.72–2.77 times longer than pronotum, sides weakly arcuate and widest at basal one-third, sparsely punctured ( Fig. 1A ); diameter of puncture about 0.013 –0.016 mm, punctures separated by more than 1.5 diameter.

Abdomen. Abdominal ventrite 1 densely punctured, diameter of puncture about 0.011 –0.015 mm, punctures separated by 0.7–1.1 diameter; abdominal ventrites 2–4 sparsely punctured, diameter of puncture less than 0.010 mm, punctures separated by more than 1.5 diameter; abdominal ventrite 5 densely punctured, diameter of puncture about 0.010 –0.012 mm, punctures separated by 0.4–0.8 diameter.

Aedeagus. Parameres entirely fused to each other, not articulated to phallobase, extended dorsally and conical in shape ( Fig. 5A ); dorsal membrane reaching apex of distipenis, ventral membrane and phallobase reaching middle of distipenis ( Fig. 5A ); internal apodeme distinct ( Fig. 5A ); combined parameres slightly longer than wide, outer margin weakly concave ( Fig. 5A ); apical setae length about 0.060 –0.070 mm, three pairs of short setae at least 2.0 times shorter than apical setae ( Fig. 5A ); distipenis 1.7 times as long as wide, not punctured, nearly parallel sided from base to middle, undulately narrowed from middle to apex ( Fig. 5A ); basipenis 3.5 times as long as wide, 2.4 times longer than distipenis.

Female unknown.

Distribution. Korea: Chungbuk Prov., Jeju Prov. ( Fig. 6 ).

Habitat. This species was collected from late autumn to winter by sifting soil and leaf litter in mixed forests.

Etymology. This species is named after the type locality, Korea.

Figures

Fig. 1. Male habitus, dorsal. A) Caenoscelis koreanus, new species, B) C. ferruginea, C) C. sibirica. Scale bars = 1.0 mm.

Fig. 2. Male left antenna, dorsal. A) Caenoscelis koreanus, new species, B) C. ferruginea, C) C. sibirica. Arrow, antennomere X. Scale bars = 0.5 mm.

Fig. 3. Pronotum, dorsal.A) Caenoscelis koreanus, new species, B) C. ferruginea, C) C. sibirica. Scale bars = 0.5 mm.

Fig. 5. Distipenis and parameres, dorsal. A) Caenoscelis koreanus, new species, B) C. ferruginea, C) C. sibirica. AS, apical seta; IA, internal apodeme; IB, inner border; LL, lateral lobe; PA, paramere. Arrow, internal sclerites. Scale bars = 0.2 mm.

Fig. 6. Collection localities in Korea. Triangle, Caenoscelis koreanus, new species; square, C. sibirica; circle, C. ferruginea.