Amara (Curtonotus) shinanensis Habu, 1953

Li, Yihang, Li, Haoyuan & Shi, Hongliang, 2024, Revision of the macropterous subgenus Curtonotus from east China, with the description of a new species (Carabidae, Zabrini, Amara), ZooKeys 1190, pp. 39-73 : 39

Amara (Curtonotus) shinanensis Habu, 1953

Curtonotus shinanensis Habu, 1953: 43 (type locality: "Flow of the Tenryu at Iijima-mura" [in Nagano, Japan]; holotype in ITLJ); Hieke 1993: 99.

Amara (Curtonotus) seishini Jedlička, 1957: 25 (type locality: "Seishin, Olto" [= Chongjin, North Korea]; holotype in NMPC); synonymized to A. (C.) shinanensis by Hieke 1993: 99.

Chinese common name.

悠游暗步甲.

Diagnosis.

Small- to medium-sized species, BL = 9.5-11.0 mm; dorsum dark brown or nearly black, legs brown; head small, ~ 1/2 of pronotum maximum width; head with one supraorbital seta. Pronotum cordate, widest near middle, densely punctate at basal and mid-anterior regions; lateral margins sinuate before posterior angles; posterior angles slightly acute or nearly rectangular, laterally protruded. Elytra relatively short, widest near middle; lateral sides of abdominal sternites finely punctate. Male mesotibiae projection composed of two denticles ( Habu 1953), which are smaller in some individuals ( Hieke 1990); the proximal denticle acutely pointed a little beyond middle, distal denticles smaller, present between the proximal one and tibiae apex. Male genitalia with short apical lamella, slightly declined rightward, narrowed at apex; gonocoxite 2 of ovipositor elongated, length ~ 2 × as greatest width, apex narrowed.

Comparison.

This species is most similar to A. (C.) tumida , which can be distinguished by having shorter apical lamella, relatively short and oval body, and wider pronotum base. To distinguish from the remaining three species, referring to comparison part of A. (C.) tumida .

Distribution.

China (Heilongjiang, Liaoning, Jilin), Japan, North Korea, Mongolia, Russia (Siberia).

Amara (Curtonotus) brevicollis species group

This group contains two species distributed in eastern China. They are characterized by a reddish brown dorsum, sometimes with a faint coppery luster, and the pronotum densely and finely punctate at anterior and lateral portions.