BYTHINOPLECTINI, SCHAUFUSS, 1890

Byeon, Ui-Joung & Park, Jong-Seok, 2023, Review of the Korean Species of the Tribe Bythinoplectini Schaufuss, 1890 (Coleoptera: Staphylinidae: Pselaphinae: Euplectitae), The Coleopterists Bulletin 77 (3), pp. 413-427 : 415

KEY TO KOREAN SPECIES OF BYTHINOPLECTINI

1. Head with lateral margins fully excavated, eyes posterior to base of frontal rostrum ( Fig. 1C )................................. 2 ( Bythinoplectina )

1′. Head with lateral margins partially excavated, eyes usually extending anterior to base of frontal rostrum ( Fig. 1D )............................... ............................................ 3 ( Pyxidicerina )

2. Antenna with ten antennomeres ( Figs. 8G , 9G ); temple short ( Figs. 8A , 9A ); aedeagus with median process blunt, additional process wrapped around median process ( Figs. 12C, G ) ......... Zethopsus omibongensis , new species

2′. Antenna with eight antennomeres ( Figs. 10G , 11G ); temple long ( Figs. 10A , 11A ); aedeagus with parameres absent, apex of median lobe blunt, lateral process wrapping around median lobe ( Figs. 12D, H ) ....................................... Euplectomorphus pygmaesimilis , new species

3. Body length 1.5–1.7 mm ( Figs. 2A, E , 3A, E ); aedeagus with incurved apical process, left median process, right median process incurved, upper angle bearing sharp apical process ( Figs. 12A, E )................................... ....... Parapyxidicerus carinatus Sawada, 1964

3′. Body length 1.3–1.5 mm ( Figs. 2B, F , 3B, F ); aedeagus with sharp right apical process, and left twisted sclerotized membranous process ( Figs. 12B, F ) ................................................ ....... Parapyxidicerus koreanus , new species

Figures

Fig. 1. Heads of Bythinoplectini. A, B) Head of Zethopsus omibongensis, new species, frontal and lateral, respectively, C) Head of Z. omibongensis, new species, dorsal view, D) Head of Parapyxidicerus koreanus, new species, dorsal view.

Fig. 8. Adult male Zethopsus omibongensis, new species. A) Head, B) Prosternum, C) Elytra, D) Meso- and metaventrites, E) Abdominal tergites, F) Abdominal sternites, G) Antennae, H) Labrum, I) Mandibles, J) Maxillae.

Fig. 9. Adult female Zethopsus omibongensis, new species. A) Head, B) Prosternum, C) Elytra, D) Meso- and metaventrites, E) Abdominal tergites, F) Abdominal sternites, G) Antennae, H) Labrum, I) Mandibles, J) Maxillae.

Fig. 12. Aedeagus. A, E) Parapyxidicerus carinatus, B, F) P. koreanus, new species, C, G) Zethopsus omibongensis, new species, D, H) Euplectomorphus pygmaesimilis, new species.

Fig. 10. Adult male Euplectomorphus pygmaesimilis, new species. A) Head, B) Prosternum, C) Elytra, D) Meso- and metaventrites, E) Abdominal tergites, F) Abdominal sternites, G) Antennae, H) Labrum, I) Mandibles, J) Maxillae.

Fig. 11. Adult female Euplectomorphus pygmaesimilis, new species. A) Head, B) Prosternum, C) Elytra, D) Meso- and metaventrites, E) Abdominal tergites, F) Abdominal sternites, G) Antennae, H) Labrum, I) Mandibles, J) Maxillae.

Fig. 2. Adult male habitus. (A–D) Dorsal view, (E–H) Ventral view. A, E) Parapyxidicerus carinatus, B, F) P. koreanus, new species, C, G) Zethopsus omibongensis, new species, D, H) Euplectomorphus pygmaesimilis, new species.

Fig. 3. Adult female habitus. (A–D) Dorsal view, (E–H) Ventral view. A, E) Parapyxidicerus carinatus, B, F) P. koreanus, new species, C, G) Zethopsus omibongensis, new species, D, H) Euplectomorphus pygmaesimilis, new species.