Five new species of Bryaxis Kugelann (Coleoptera, Staphylinidae, Pselaphinae) from Korea and a nomenclatural note on Bryaxis mahunkai Loebl Author Choi, Yeon-Jae https://orcid.org/0000-0003-0172-1128 Department of Biological Sciences and Biotechnology, Chungbuk National University, Cheongju 28644, Republic of Korea Author Park, Sun-Jae https://orcid.org/0000-0003-3759-6517 Climate Change and Environmental Biology Research Division, National Institute of Biological Resources, Incheon 22689, Republic of Korea Author Lee, Seung-Gyu https://orcid.org/0000-0001-5576-2799 Climate Change and Environmental Biology Research Division, National Institute of Biological Resources, Incheon 22689, Republic of Korea Author Park, Jong-Seok https://orcid.org/0000-0003-2063-2534 Department of Biological Sciences and Biotechnology, Chungbuk National University, Cheongju 28644, Republic of Korea jpark16@cbnu.ac.kr text ZooKeys 2023 2023-10-13 1182 165 181 http://dx.doi.org/10.3897/zookeys.1182.97346 journal article http://dx.doi.org/10.3897/zookeys.1182.97346 1313-2970-1182-165 86F5AC45D35E4DDFAB042BCBDEEE8407 DCECB4AAD9E95ADB80188D91F386DD1C Bryaxis girinensis Choi, Park, Lee & Park sp. nov. Figs 7 , 9A, C, E Type material ( N = 1, 1 ♂) . Holotype male . "Korea: Gangwon Prov. Bangdong-ri, Girin-myeon, Inje-gun, 23 Jun 2009, sifting flood debris, T.-K. Kim, CNUIC" (NIBR). Diagnosis. Antennal pedicels less enlarged subglobose, with dorsolateral glandular nodule on subapical (Fig. 7C, D , arrows); protibiae with spine on internal side at widest point (Figs 7E , 9C , arrows); parameres of male genitalia with depression on lateral margin and three setae on apical (Fig. 7G ). Figure 7. Bryaxis girinensis Choi, Park, Lee & Park, sp. nov. A dorsal habitus B ventral habitus C head D antenna E fore leg F hind leg G aedeagus. Scale bars: 1 mm ( A, B ); 0.1 mm ( C, G ); 0.5 mm ( D-F ). Description. Body reddish brown, antennae, maxillary palpi, and tarsi slightly lighter, length 1.62 mm, maximum width 0.70 mm (Fig. 7A, B ). Setae on body yellowish, long and dense. Head long as wide (Fig. 7C ). Frons with U-shaped impression between antennal tubercles; frontal foveae absent; frontal rostrum distinct anteriorly. Vertex slightly convex; longitudinal carina present; vertexal foveae small. Eyes large with 34 facets. Maxillary palpi moderately developed; palpomeres II-III with dense tubercles; palpomere IV 0.25 mm long and about 3.30 times as long as wide, subcylindrical pseudosegment at apex. Antennae about 0.54 mm long; scapes subcylindrical, without modification, 1.83 times as long as pedicels; pedicels long as wide; antennomere III 1.70 times as long as wide; IV-VIII subequal in length; IX 0.89 times as long as wide; X 0.78 times as long as wide; XI largest, pointed at apex, 1.86 times as long as wide (Fig. 7D ). Pronotum 0.79 times as long as wide and widest at basal 3/5, lateral antebasal foveae connected by antebasal sulcus. Elytra slightly convex, 0.98 times as long as wide and widest at basal 1/3, each elytron with two basal foveae and subhumeral fovea. Legs robust; metatibiae with spine at apex (Fig. 7E , arrow). Aedeagus large, 0.36 mm long and 2.05 times as long as wide; penis fusiform and dorsal diaphragm transversely ovoid; parameres short and symmetrical, apices truncated; endophallus composed of two fine struts, asymmetrical (Fig. 7G ). Sexual dimorphism . Unknown. Remarks. The adult of this species is similar to Bryaxis nemorosus Choi, Park, Lee & Park sp. nov. in the shape of antennomeres IV-XI (Figs 7D , 8F ). However, it can be distinguished by the robust setae on the body (Fig. 7A ), large eyes as long as the tempora (Fig. 9E ), a strongly tuberculate maxillary palpomere II (Fig. 9A ), protibiae with a spine at the widest point (Fig. 9C , arrow), and a simple endophallus of the male genitalia (Fig. 7G ). Etymology. This species is named after the type locality, Girin-myeon, Inje-gun. Habitat. The holotype was collected by sifting flood debris in mixed forest. Distribution. Korea (Inje-gun, Gangwon-do).