Nebria (Falcinebria) furcata, 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) furcata sp. nov. Figs 11 , 27 , 28 Japanese name: Inoue-hime-marukubi-gomimushi

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

Notes.

This species in known from two localities near Mount Hakusan where N. niohozana and N. pisciformis sp. nov. co-occur. This species is distinguished from N. niohozana by a smaller body size and larger PPW/EL (values for male N. niohozana from Mount Hakusan: body length, 10.24-10.90 mm; PPW/EL, 0.289-0.321 (n = 4); values for females are not shown due to unavailability of specimens), and from N. pisciformis , by larger PPW/EL and a trifurcate apical margin of the dorsoapical lobe.

Description.

Body length: ♂, 9.27-9.65 mm (mean ± SD: 9.48 ± 0.19 mm, n = 3); ♀, 10.21-10.60 mm (mean ± SD: 10.46 ± 0.13 mm, n = 4). PPW/EL: ♂, 0.323-0.341 (mean ± SD: 0.334 ± 0.009, n = 3); ♀, 0.311-0.320 (mean ± SD: 0.316 ± 0.004, n = 4). Ventral surface of aedeagal apex not concave. Dorsobasal lobe present. Dorsomedian lobe absent. Dorsoapical lobe with the basal part protruding dorsally; the protrusion as long as and 1.5 times as wide as the right laterobasal lobe; the apical portion directed ventrally, twice as wide as the subapical constriction; the apical margin divided into four projections. 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 small, strongly bent at the middle in an anterior direction. Left lateroapical lobe moderate in size, more or less bifurcate. Ventrobasal surface almost flat, without swellings.

Type materials.

Holotype: ♂ (KS), Arashiguchi, Kamiuchinami, Ôno-shi, Fukui Prefecture, Japan, 26.v.2019, S. Inoue leg. Paratypes: 1♀ (KS), same data as the holotype; 2♂3♀ (NARO), Amô Pass-Shoyashiki, Hida-shi, Gifu Prefecture, Japan, 19.vi.1972, K. Tanaka & H. Ohira leg.

Etymology.

The specific name derives from the Latin word furcata (forked) and refers to the apical margin of the 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 27 - 30. Right lateral (a), ventral (b), left lateral (c), and anterior (d) views of the endophallus and dorsal (e), posterodorsal (f), and left dorsolateral (g) views of the dorsoapical lobe of Nebria spp. 27 N. furcata sp. nov., holotype male 28 N. furcata sp. nov., paratype males from Amo Pass-Shoyashiki 29 N. pisciformis sp. nov., holotype male 30 N. kuragadakensis sp. nov., holotype male. db, dorsobasal lobe; other abbreviations are given in Figures 17 - 21. In N. furcata (27, 28), a 1 - 4 denotes apices of the dorsoapical lobe, and 28 d ' is presented to show individual variation in the focal endophallus structures.