Trephionus abiba Sasakawa & Ito

Sasakawa, Koji & Ito, Hirotaro, 2018, Taxonomic notes on the ground beetles in the genus Trephionus Bates, 1883 from central Honshu, Japan (Coleoptera, Carabidae, Sphodrini, Synuchina), ZooKeys 742, pp. 91-104 : 98-99

Trephionus abiba Sasakawa & Ito sp. n. [Japanese name: Ishikiri-hoso-hirata-gomimushi] Figs 8, 18

Type material.

Holotype: ♂, Mt. Ishikiri (entrance of the Ishikiri Cave), Haguro, Tainai-shi, Niigata Pref. (38.051754°N, 139.435703°E), 23.V.2013, H. Itô leg. Paratype: 1♀, same data as the holotype.

Diagnosis.

Among the species with truncate aedeagal apex, similar to T. shibataianus and T. bifidilobatus sp. n. in having small body. Distinguished from the former by larger PI (i.e., wider pronotum) and from the latter by blacker dorsal surface (Figs 8, 9). Readily distinguished from sympatric T. babai by smaller body and distinctly sinuate pronotal lateral margin near the base.

Description.

Body length: ♂, 8.1 mm (n = 1); ♀, 9.8 mm (n = 1). PI: ♂, 1.27 (n = 1); ♀, 1.31 (n = 1). Head and pronotum black; elytra blackish brown to black (Fig. 8). Mid and hind tarsal segment 1 biculcate, segment 5 without secondary setae on dorsal side. Apex of aedeagus truncate (Fig. 18c); endophallus (Fig. 18a, b) stout, almost straight, directed posterodorsally; gonopore opening directed right-dorsoposterolaterally; dorsobasal lobe narrowly swollen, with BD less than AW; right laterobasal lobe absent; left laterobasal lobe widely swollen, with BD as wide as AW; dorsoapical lobe simple form, rudimentary, with BD less than half of AW; sclerotization of sclerotized lobe as same as aedeagus; sclerotized rim of gonopore not distinct.

Etymology.

The name is an anagram of the specific name of the sympatric species T. babai .