Nebria (Falcinebria) sagittata, Sasakawa, 2020

Sasakawa, Koji, 2020, Taxonomic studies of the ground beetle subgenus Falcinebria Ledoux & Roux, 2005 (Coleoptera, Carabidae, Nebria) from Honshu, Japan, ZooKeys 902, pp. 37-60 : 37

Nebria (Falcinebria) sagittata sp. nov. Figs 6 , 18 , 19 Japanese name: Asahi-hime-marukubi-gomimushi

Nebria reflexa : Uéno (1985): 56 (part); Nakane (1963b): 19 (part).

Notes.

This species is known from the Asahi Mountains and the adjacent Mount Gassan. It is likely sympatric with N. niohozana and is distinguished from that species by a smaller body size and a larger PPW/EL. Among known related species, N. sagittata sp. nov. is most similar to N. iidesana sp. nov., in both external and endophallic structures, but it is distinguished by a strong bend in the apical portion of the right lateroapical lobe.

Description.

Body length: ♂, 9.22-9.87 mm (mean ± SD: 9.54 ± 0.26 mm, n = 9); ♀, 9.77-10.92 mm (mean ± SD: 10.07 ± 0.43 mm, n = 6). PPW/EL: ♂, 0.317-0.345 (mean ± SD: 0.331 ± 0.009, n = 9); ♀, 0.307-0.333 (mean ± SD: 0.320 ± 0.009, n = 6). Ventral surface of aedeagal apex not concave. Dorsobasal lobe absent. Dorsomedian lobe absent. Dorsoapical lobe with the basal part protruding anterodorsally; the protrusion longer than the right laterobasal lobe; the apical portion directed dorsally, bifurcated at the apex; the left apex more than twice the size of the right apex. Right laterobasal lobe small, with the width from the ventral view narrower than the width of the gonopore protrusion from the lateral view. Left laterobasal lobe small, with the width from the ventral view narrower than the width of the gonopore protrusion from the lateral view. Right lateroapical lobe large, narrowed apically; apical half strongly bent in an anterior direction. Left lateroapical lobe large, narrowed apically. Ventrobasal surface almost flat, without swelling.

Type materials.

Holotype: ♂ (KS), Riv. Higuresawa, ca 625 m, Nishikawa-machi, Yamagata Prefecture, Japan (38.320729N, 139.942376E), 9-12.ix.2004, K. Sasakawa leg. Paratypes: 6♂6♀ (KS), same data as the holotype; 1♂ (NARO), “Tachiyazawa-Vill.” [Tachiyazawa, Shônai-machi], Yamagata Prefecture, Japan, 2.viii.1960, Y. Watanabe leg.; 1♂ (NARO), “Asahi-mura” [a part of Murakami-shi], Niigata Prefecture, Japan, K. Baba leg.

Etymology.

The specific name derives from the Latin word sagittata (arrow-shaped) and refers to the dorsal view of dorsoapical lobe.

Figures

Figures 5 - 16. Habitus dorsal view of Nebria spp. 5 N. reflexa, a male from the type locality 6 N. sagittata sp. nov., holotype male 7 N. iidesana sp. nov., holotype male 8 - 10 N. niohozana males from Mount Chokai (8), Doai, a locality close to the type locality designated for the lectotype (9), and Mount Hakusan (10); 11 N. furcata sp. nov., holotype male 12 N. pisciformis sp. nov., holotype male 13 N. kuragadakensis sp. nov., holotype male 14 N. dichotoma sp. nov., holotype male 15 N. uenoi, a male from the type locality 16 N. chugokuensis sp. nov., holotype male.

Figures 17 - 21. Right lateral (a), ventral (b), dorsal (c), and posterodorsal (d) views of the endophallus and the left dorsolateral view of the dorsoapical lobe (e) of Nebria spp. 17 N. reflexa male from the type locality 18 N. sagittata sp. nov., holotype male 19 N. sagittata sp. nov., a paratype male from " Asahi-mura " 20 N. iidesana sp. nov., holotype male 21 N. iidesana sp. nov., paratype male from Mount Kitamata. Abbreviations: da, dorsoapical lobe; dm, dorsomedian lobe; go, gonopore; gp, gonopore protrusion; la, left lateroapical lobe; lb, left laterobasal lobe; ra, right lateroapical lobe; rb, right laterobasal lobe. Asterisk indicates that the gonopore protrusion or lobes are not fully everted.