Bryaxis fabaiformis
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Ordo: Coleoptera
Familia: Staphylinidae
Genus: Bryaxis
Name
Bryaxis fabaiformis Choi, Park, Lee & Park sp. nov. – Wikispecies link – ZooBank link – Pensoft Profile
Type materials
(N = 4, 3♂♂, 1♀) . Holotype male. “Korea: Gangwon Prov. Gujeol-ri, Yeoryang-myeon, Jeongseon-gun, 24 Apr 2020, 37°31'08.3"N, 128°46'43.0"E, 552 m, sifting soil & leaf litter, U.-J. Byeon, T.-Y. Jang” (NIBR). Paratypes. (CBNUIC, 1♂ slide mounted, 1♂, 1♀ dried). “Korea: Gangwon Prov. Gujeol-ri, Yeoryang-myeon, Jeongseon-gun, 24 Apr 2020, 37°31'08.3"N, 128°46'43.0"E, 552 m, sifting soil & leaf litter, U.-J. Byeon, T.-Y. Jang”.
Diagnosis
Enlarged fabiform antennal pedicels with subcylindrical glandular nodule on inner margin in male (Figs 5E, F, 6A, arrows).
Description
Body reddish brown, antennae, maxillary palpi, legs slightly lighter than body, length 1.29–1.41 mm, maximum width 0.60–0.64 mm (Fig. 5A–D). Setae on body golden and long. Head 0.84–1.00 times as long as wide (Fig. 5F). Frons with U-shaped impression between antennal tubercles; frontal foveae absent; frontal rostrum distinct anteriorly. Vertex weakly convex; longitudinal carina distinct; vertexal foveae enlarged. Eyes large with 31–32 facets. Maxillary palpi moderately developed; palpomeres II–III with sparse tubercles; palpomere IV 0.25–0.29 mm long and about 2.92–3.44 times as long as wide, subcylindrical pseudosegment at apex. Antennae about 0.58–0.61 mm long; scapes short, without modification, 0.73–1.11 times as long as pedicels; pedicels 1.02–1.19 times as long as wide; antennomere III 1.18–1.23 times as long as wide; IV–VIII subequal in length; IX–X transverse, IX 0.66–0.69 times as long as wide and X 0.62–0.63 times as long as wide; XI largest, pointed at apex, 1.65–1.75 times as long as wide (Fig. 5F). Pronotum 0.84–0.89 times as long as wide and widest at basal 3/5, lateral antebasal foveae connected by antebasal sulcus. Elytra convex, 0.85–0.94 times as long as wide and widest at basal 1/3, each elytron with two basal foveae and subhumeral fovea. Legs slender; protibiae without spine (Fig. 5G); metatibiae with spine at apex (Fig. 5H, arrow). Aedeagus robust, 0.43 mm long and 1.79 times as long as wide; penis bulbous and dorsal diaphragm circular; parameres small and symmetrical, each with three setae; endophallus comprising two symmetrical struts, each broadened basally and apically, and shortly branched basally (Fig. 5I).
Sexual dimorphism. Female eyes slightly shorter than tempora, comprising 9 facets; antennal pedicels without modification; metatibial spines absent.
Remarks
Adults of this species are similar to those of Bryaxis kimjongkuki Nomura & Lee, 1993 in having the maxillary palpomere II–III with tubercles and asymmetrical antennal scapes. However, they can be recognized by having a rounded tempora as long as the eyes (Fig. 6E), a glandular nodule situated at the mid-level of the antennal pedicels (Fig. 6A, arrow), and protibiae without a spine (Fig. 6C).
Comments
The localities of B. fabaiformis sp. nov. probably overlap with those of B. kimjongkuki Nomura & Lee given that the latter species was abundantly collected near the type localities of the former (Fig. 11).
Etymology
The specific epithet is a combination of the Latin words faba (“bean”, feminine) and -formis (“having the form of”, masculine/feminine) and refers to the shape of antennal pedicels in the male.
Habitat
Specimens of this species were collected by sifting soil and leaf litter in mixed forest.
Distribution
Korea (Jeongseon-gun, Gangwon-do).
Original Description
- Choi, Y; Park, S; Lee, S; Park, J; 2023: Five new species of Bryaxis Kugelann (Coleoptera, Staphylinidae, Pselaphinae) from Korea and a nomenclatural note on Bryaxis mahunkai Löbl ZooKeys, 1182: 165-181. doi
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