Trephionus bifidilobatus 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 : 99-100

Trephionus bifidilobatus Sasakawa & Ito sp. n. [Japanese name: Mitake-hoso-hirata-gomimushi] Figs 9, 19

Type material.

Holotype: ♂, Kotosawa, alt. ca. 310 m, Mitake, Oume-shi, Tokyo (35.795931°N, 139.168746°E), 10-12.IX.2009, K. Sasakawa leg.

Diagnosis. Similar to T. shibataianus and T. abiba sp. n. in having truncate aedeagal apex and small body, but distinguished by larger PI (i.e., wider pronotum) and reddish brown elytra.

Description.

Body length: ♂, 8.2 mm (n = 1). PI: ♂, 1.32 (n = 1). Head and pronotum black, elytra reddish brown. Pronotal lateral margins sinuate before hind angles (Fig. 9). Mid tarsal segment 1 bisulcate; hind tarsal segment 1 sulcate on outer side, not on inner side; tarsal segment 5 lacks secondary setae on dorsal side. Apex of aedeagus truncate, slightly emarginated at middle (Fig. 19c); endophallus (Fig. 19a, b) stout, almost straight, directed posterodorsally; gonopore opening directed right-dorsoposterolaterally; dorsobasal lobe widely swollen, with BD wider than AW; right laterobasal lobe widely swollen, with BD as wide as AW; left laterobasal lobe widely swollen, with BD wider than AW; dorsoapical lobe markedly developed, bifid at apex, with BD more than 0.8 times AW; sclerotization of sclerotized lobe as same as aedeagus; anteroposterior length of sclerotized rim of gonopore as long as proximodistal length of sclerotized lobe.

Etymology.

The name refers to the bifid apex of the dorsoapical lobe of the endophallus.