Bryaxis uljinensis Choi, Park, Lee & Park, 2023

Choi, Yeon-Jae, Park, Sun-Jae, Lee, Seung-Gyu & Park, Jong-Seok, 2023, Five new species of Bryaxis Kugelann (Coleoptera, Staphylinidae, Pselaphinae) from Korea and a nomenclatural note on Bryaxis mahunkai Loebl, ZooKeys 1182, pp. 165-181 : 165

publication ID	https://dx.doi.org/10.3897/zookeys.1182.97346
publication LSID	lsid:zoobank.org:pub:86F5AC45-D35E-4DDF-AB04-2BCBDEEE8407
persistent identifier	https://treatment.plazi.org/id/CF039CE1-2159-4BF5-8E6A-5B9508CBEAC5
taxon LSID	lsid:zoobank.org:act:CF039CE1-2159-4BF5-8E6A-5B9508CBEAC5
treatment provided by	ZooKeys by Pensoft
scientific name	Bryaxis uljinensis Choi, Park, Lee & Park
status	sp. nov.

Treatment

Bryaxis uljinensis Choi, Park, Lee & Park sp. nov.

Figs 3 View Figure 3 , 4A, C, E View Figure 4

Type materials

(N = 7, 4 ♂♂, 3 ♀♀). Holotype male. "Korea: Gyeongbuk Prov. Onjeong-myeon, Uljin-gun, 8 Jun 2019, 36°43'23.0"N, 129°20'16.0"E, 180 m, sifting leaf litter near stream, J.-S. Park" (NIBR). Paratypes. 2♂♂ (CBNUIC, 1♂ slide mounted, 1♂ dried). "Korea: Gangwon Prov. Gujeol-ri, Yeoryang-myeon, Jeongseon-gun, 24 Apr 2020, 37°31'08.7"N, 128°46'42.8"E, 591 m, sifting leaf & soil litter, U.-J. Byeon, T.-Y. Jang". 1♂, 3♀♀ (CBNUIC, dried). "Korea: Gangwon Prov. Gujeol-ri, Yeoryang-myeon, Jeongseon-gun, 24 Apr 2020, 37°30'57.6"N, 128°45'18.8"E, 510 m, sifting ant colony, leaf & soil litter, Y.-J. Choi, U.-J. Byeon".

Diagnosis.

Antennal pedicel strongly swollen, subglobose with subcylindrical glandular nodule on basal 1/3 of inner margin (Figs 3F View Figure 3 , 4C View Figure 4 , arrows); protibiae with spine on internal side of widest (Figs 3G View Figure 3 , 4E View Figure 4 , arrows); parameres of male genitalia robust and fan-shaped, bearing three setae on each (Fig. 3I View Figure 3 ).

Description.

Body reddish brown, antennae, maxillary palpi, legs slightly lighter than body, length 1.25-1.31 mm, maximum width 0.53-0.60 mm (Fig. 3A-D View Figure 3 ). Setae on body yellowish, and short. Head 0.98 times as long as wide (Fig. 3E View Figure 3 ). Frons with small U-shaped impression between antennal tubercles; frontal foveae absent; frontal rostrum slightly distinct anteriorly. Vertex convex; longitudinal carina present; vertexal foveae small. Eyes large, longer than twice that of tempora, composed of 32-34 facets. Maxillary palpi moderately developed; palpomeres II-III smooth; palpomere IV 0.22 mm long and about 3.16 times as long as wide, subcylindrical pseudosegment at apex. Antennae about 0.53 mm long; scapes short without modification, 0.92 times as long as pedicels; pedicels long as wide; antennomere III-VIII subequal in length; IX 0.63 times as long as wide; X transverse, 0.61 times as long as wide; XI largest, pointed at apex, 1.61 times as long as wide (Fig. 3F View Figure 3 ). Pronotum 0.88 times as long as wide and widest at basal 3/5, lateral antebasal foveae connected by antebasal sulcus. Elytra convex, 0.85 times as long as wide and widest at basal 1/3, each elytron with two basal foveae and subhumeral fovea. Legs robust; internal spine on widest of protibiae (Fig. 3G View Figure 3 , arrow); metatibiae with spine on apical (Fig. 3H View Figure 3 , arrow). Aedeagus small, 0.27 mm long and 1.61 times as long as wide; penis small fusiform and dorsal diaphragm bulbous; parameres symmetrical; endophallus composed with two convergent, slender struts (Fig. 3I View Figure 3 ).

Sexual dimorphism. Female eyes slightly longer than tempora, composed of 15 facets; antennal pedicels simple; protibial spines and metatibial spines absent.

Remarks.

Adults of this species are very similar to Bryaxis mahunkai Löbl, 1975 in having strongly swollen antennal pedicels (Fig. 4C, D View Figure 4 ). However, they can be distinguished by smooth maxillary palpomere II-III (Fig. 4A View Figure 4 ), apically symmetrical antennal scapes, pedicels less swollen apically and bearing smaller glandular nodules (Fig. 4C View Figure 4 , arrow), fore legs with a tibial spine (Fig. 4E View Figure 4 , arrow), and parameres wider than the penis (aedeagus in B. mahunkai as wide as penis; Fig. 10C, D View Figure 10 ).

Comments.

The localities of B. uljinensis sp. nov. probably overlap with those of B. mahunkai Löbl given that the latter are nationally distributed (Fig. 11 View Figure 11 ).

Etymology.

This species is named after the type locality, Uljin-gun.

Habitat.

The holotype was collected by sifting leaf litter in mixed forest. Paratypes were collected by sifting leaf litter, soil, and an ant colony.

Distribution.

Korea (Uljin-gun, Gyeongsangbuk-do; Jeongseon-gun, Gangwon-do).