Leptoplectus koreanus, Byeon, Jang, Park, Kim, and Park, 2021

Byeon, Ui-Joung, Jang, Min-Sang, Park, Sun-Jae, Kim, A-Young & Park, Jong-Seok, 2021, Review of Korean Species of the Genus Leptoplectus Casey (Coleoptera: Staphylinidae: Pselaphinae: Euplectitae) with Description of a New Species, The Coleopterists Bulletin 75 (3), pp. 689-694 : 692-693

LEPTOPlECTUS kOrEanUS Byeon, Jang, Park, Kim, and Park , new species zoobank.org/ urn:lsid:zoobank.org:act:54C9F8FB-D23C-45C1-863C-30C490BFCB03 ( Figs. 4–6 )

Material Examined. Holotype. 1♂ (specimen dissected and mounted in euparal on glass slide, deposited in NIBR), “ Korea: Gangwon Prov. / Misiryeongyet-gil,/ Toseong-myeon, Goseong-gun / / 38°12′48.0′′N 128°28′23.0′′E,/ 370m, 09VI2019 / Sifting of Leaf & log litter near/stream/ J. -S. Park ” . Paratype. 1♀ ( CBNUIC), same data as holotype .

Diagnosis. The species can be distinguished from other Korean Leptoplectus by the following combination of characters: metatrochanter with spine ( Fig. 5F , arrow); each elytron with three basal foveae ( Fig. 5A , left arrow); median lobe of male genitalia distinctively asymmetric and divided into two branches, left longer than right with many long setae ( Fig. 5G ).

Description. Body length 1.1–1.4 mm. Body color reddish-brown ( Figs. 4A–B ). Head. Head subquadrate with vertexal foveae ( Fig. 4C ). Antennomere 2 subquadrate, 3–10 gradually more transverse, 11 largest ( Fig. 5E ). Thorax. Pronotum about as long as wide, with lateral antebasal foveae and transverse antebasal sulcus. Prosternum with anteroprosternal foveae and lateral procoxal foveae ( Fig. 4D ). Each elytron longer than wide with subhumeral basolateral foveae and three basal foveae ( Fig. 5A , arrows). Pro- and mesotibiae with small preapical tubercle. Metatrochanter with spine. Abdomen. Abdominal tergites IV–V with mediobasal foveae and discal carina ( Fig. 5B , arrow). Abdominal sternites IV–V with basolateral foveae ( Fig. 5C , right arrow), IV with mediobasal foveae ( Fig. 5C , left arrow). Aedeagus. Median lobe of male genitalia distinctively asymmetric and divided into two branches, left longer than right with many long setae ( Fig. 5G ).

Distribution. Korea ( Fig. 6 , square).

Habitat. This species was collected during May by sifting leaf and log litter in a wet forest.

Figures

Fig. 4. Leptoplectus koreanus, new species. A) Dorsal male habitus, B) Ventral male habitus, C) Dorsal head, D) Ventral prosternum. Scale bars = 1 mm (A–B), 0.1 mm (C–D).

Fig. 5. Leptoplectus koreanus, new species. A) Dorsal elytra, B) Abdominal tergites IV–V, C) Abdominal sternites III–V, D) Ventral meso- and metaventrite, E) Antenna, F) Hind leg, G) Lateral median lobe of male genitalia. Scale bars = 0.1 mm.

Fig. 6. Collection sites for Leptoplectus in Korea. L. illex, circles; L.koreanus, new species, square; L.vagans, pentagon.