Trephionus inexpectatus 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

Trephionus inexpectatus Sasakawa & Ito sp. n. [Japanese name: Akaishi-hoso-hirata-gomimushi] Figs 7, 17

Type material.

Holotype: ♂, Kitazawa Pass, alt. ca. 2000 m, Hase-mura, Nagano Pref., 7-15.X.1998, M. Hama leg.

Diagnosis.

Readily distinguished from T. subcavicola by the absence of inner sulcus of hind tarsal segment 5 ( Habu 1978; Tanaka 1985). From other species with truncate aedeagus apex, distinguished by larger body and more blackish dorsal surface (Figs 6-9).

Description.

Body length: ♂, 8.8 mm (n = 1). PI: ♂, 1.26 (n = 1). Dorsal surface black. Pronotal lateral margins slightly sinuate before hind angles (Fig. 7). Mid tarsal segment 1 bisulcate; hind tarsal segment 1 sulcate on outer side, not on inner side; mid and hind tarsal segment 5 lacks secondary setae on dorsal side. Apex of aedeagus truncate (Fig. 17c); endophallus (Fig. 17a, b) stout, almost straight, directed posterodorsally; gonopore opening directed right-dorsoposterolaterally; dorsobasal lobe widely swollen, with BD slightly less than half of AW; both sides of laterobasal lobe absent; dorsoapical lobe conical form, widely rounded at apex, with BD more than half of but less than AW; sclerotization of sclerotized lobe the same as aedeagus; anteroposterior length of sclerotized rim of gonopore as long as proximodistal length of sclerotized lobe.

Etymology.

The name refers to the unexpected discovery of this species, which is externally similar to other congeneric species with simple aedeagus apex such as T. kinoshitai , T. cylindriphallus and T. babai .