Caenoscelis

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

KEY TO KOREAN SPECIES OF THE GENUS CAENOSCELIS

1. Body slender, about 2.6–2.7 times as long as wide ( Fig. 1A ). Male 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, lateral margin uniformly curved anteriorly and posteriorly ( Fig. 3A )........................ Caenoscelis koreanus, Shin, Park, Lee, and Park , new species

1′. Body robust, about 2.3–2.5 times as long as wide ( Figs. 1B, C ). Male antennomere X transverse, slightly wider than IX, setae present apically ( Figs. 2B, C ); antennomere XI longer than X ( Figs. 2B, C ). Pronotum about 1.30–1.40 times as wide as long, anterior lateral margin more strongly curved than posterior ( Figs. 3B, C )..................................2

2. Head sparsely punctured, dorsal punctures separated by more than their diameter ( Fig. 4A ). Parameres triangular, evenly punctured, long apical setae absent ( Fig. 5B ); lateral lobes hook-shaped, moderately punctured ( Fig. 5B )........ ........ Caenoscelis ferruginea (C. R. Sahlberg)

2′. Head densely punctured, dorsal punctures separated by less than their diameter ( Fig. 4B ). Parameres trapezoidal, distally punctured, pair of long apical setae present ( Fig. 5C ); lateral lobes folded near apex, coarsely punctured ( Fig. 5C ). .......... Caenoscelis sibirica Reitter

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. 4. Head, dorsal. A) Caenoscelis ferruginea, B) C. sibirica. Scale bars = 0.2 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.