Nebria (Falcinebria) taketoi Habu, 1962

Sasakawa, Koji, 2023, Taxonomic study of the alpine carabid beetle Nebria (Falcinebria) taketoi Habu, 1962 (Coleoptera, Carabidae), Alpine Entomology 7, pp. 185-194 : 185

Nebria (Falcinebria) taketoi Habu, 1962

Figs 3A, B, E, F, I, J , 4

Nebria taketoi Habu: Habu (1962): 2 (original description, type locality "Mikurigaike, Mt. Tateyama, Toyama Prefecture", subgenus Nebria Paranebria ); Nakane (1974): 15 (part, subgenus not specified); Farkač and Janata (2003): 94 (subgenus Nebria Paranebria ); Ledoux and Roux (2005): 831 (misidentified type locality "Japon, mont Yatsuga-take", subgenus Nebria Falcinebria ); Yoshitake et al. (2011): 4 (subgenus Nebria Paranebria ); Yoshitake et al. (2011): 34 (part, subgenus Nebria Falcinebria ); Huber (2017): 50 (misidentified type locality "Yatsudatake Mts.", subgenus Nebria Falcinebria ); Yoshimatsu et al. (2018): 38 (part, subgenus Nebria Falcinebria ).

Nebria nakanei Uéno: Uéno (1953): 58 (unavailable name under International Code of Zoological Nomenclature (ICZN) article 8.3, specimen(s) from "the Azusagawa River, Kamikôchi”, subgenus Nebria Paranebria ); Nakane (1963): 19 (part, subgenus Nebria Paranebria ); Ledoux and Roux (2005): 832 (subgenus Nebria Falcinebria ); Huber (2017): 50 (synonym of Nebria taketoi ).

Notes.

In his brief review of Japanese Nebria , Uéno (1953) reported on a species of Nebria referred to as Nebria nakanei based on specimen(s) from Kamikôchi in the Hida Mountains, with a comment that the species would later be formally described as a new species. However, a description of N. nakanei was never published. Habu (1962) described Nebria taketoi based on a male from Mount Tateyama in the Hida Mountains; this species is apparently identical to N. nakanei . In his brief review of Japanese Nebria , Nakane (1974) treated this species under the name N. taketoi and stated that it is most likely conspecific with N. nakanei . That report included a line drawing of the pronotum of an individual from the Yatsugatake Mountains. This complicated nomenclatural history was not correctly understood by researchers outside Japan, in part because the reports by Uéno (1953) and Nakane (1974) were written in Japanese. In Ledoux and Roux (2005), the type locality of N. taketoi was described as the Yatsugatake Mountains, and N. nakanei was treated as a related species of N. taketoi . This was probably due to the misidentification of the Yatsugatake Mountains, whose specimen was described by Nakane (1974), as the same as the type locality of N. taketoi . In the Catalogue of Palaearctic Coleoptera , which is widely accepted by experts, N. taketoi and N. nakanei are treated as the same species under the name of N. taketoi , but the reason for this classification is not provided ( Farkač and Janata 2003; Huber 2017). The type locality was again given as the Yatsugatake Mountains. Since Uéno (1953) himself did not intend to describe this species in his publication, the nomenclature of N. nakanei used in that report was not accepted according to ICZN article 8.3, such that N. nakanei remains an unavailable name. Therefore, N. taketoi should be used as the name of this species, and its type locality is "Mikurigaike, Mt. Tateyama," as stated in Habu (1962).

Materials examined.

Holotype ♂ (NARO), " VIII. 5, 1961 / Mikurigaike / Mt. Tateyama / Toyama P. / A. TAKETO // Holotype / Nebria . / Nebria taketoi / HABU"; 2♂ 5♀ [1♂ 3♀ (KSWD), 1♂ 2♀ (TCSM)], Murodôdaira, alt. 2390 m, Ashikuraji , Tateyama-machi , Nakaniikawa-gun , Toyama Prefecture, Japan (36°34'43"N, 137°36'6"E), 27.viii.2019, Kenta Sawada leg.; 1♂ 1♀ (NARO), Renge-Onsen, Mount Shiroumadake, Itoigawa-shi, Niigata Prefecture, Japan, 29.vii.1977, K. Baba leg.; 1♂ (NARO), Mount Yukikuradake, Itoigawa-shi, Niigata Prefecture, 26.vii.1961, K, Baba leg.

Diagnosis.

Nebria taketoi is distinguished from the new species described below by less protruded anterior angles of the pronotum, more densely punctated pronotal margin and the ventral sides of some of its notal and abdominal segments, and not bifurcated apices of lateroapical and dorsoapical lobes of the endophallus. Among specimens previously treated as N. taketoi , the absence of setigerous punctures on elytral stria 1 is a character found only in individuals of N. taketoi . However, due to individual variation, in which setigerous punctures are seen in a few individuals, the presence of this character does not provide a definitive diagnosis at the individual level.

Description.

Body length: ♂, 10.29-10.94 mm (mean ± SD: 10.62 ± 0.28 mm, n = 5); ♀, 10.42-12.16 mm (mean ± SD: 11.31 ± 0.65 mm, n = 6).

Head: Dorsal surface smooth, except for frontal impressions, the surfaces of which are more or less wrinkled. Antennomere 1 usually with one seta, rarely two setae.

Pronotum: Surface near and in front of anterior transverse impression moderately punctate but clearly lacking punctations near the anterior margin; surfaces of lateral margins, laterobasal impressions, and area between the transverse groove and the posterior margin moderately punctate.

Elytra: Anteroposterior length between the level of the basal transverse line and that of the posterior end of the scutellar stria more than twice as long as the anteroposterior length between the level of the basal transverse line and that of the posterior end of the scutellum. Setigerous punctures on stria 1 variable at the individual level, including one on both sides, one on either side, and absent on both sides.

Ventral side: Submentum with 16-25 setae. Surface punctations of prosternum near the anterior margin and anterolateral corners and pleuron sparser than those at the pronotal laterobasal impressions. Mesosternal, metasternal, and abdominal surface almost smooth, except for mesepisternum, mesepimeron, metepisternum, metasternum, and metacoxa for all specimens examined, and sternite II for some specimens. All surfaces of the mesepisternum, mesepimeron, and metepisternum, and the lateral side of the metasternum until the metepisternum punctate to the same degree as pronotal laterobasal impressions. Metacoxae punctate at lateral sides, with the degree of punctation varying among individuals, ranging from only a few punctations to the same degree as the metepisternum; in all cases, punctures weaker than those of the mesepisternum, mesepimeron, and metepisternum. Punctures of sternite II varying from absent to punctation as extensive as on other notal parts. Sternites IV-VI with three to six setae on each lateral side. Male sternite VII with two setae on each lateral side.

Male genitalia: Laterobasal lobes semi-ellipsoid, with the basal diameter smaller than the height; inflated lobes directed ventrobasally, covering the aedeagal apex on lateral views. Lateroapical lobe broadly rounded at apex, directed lateroapically, not bent, and larger than the laterobasal lobes. Dorsoapical lobe with two protrusions on dorsobasal and dorsomedian parts; protrusions weakly bent, directed basally, and smaller than the lateroapical lobes; apex of the protrusions narrowly rounded; in the specimens examined, the dorsoapical lobe apex was not fully inflated, but its shape is probably broadly rounded or slightly widened. Ventrobasal swelling large and semi-spherical on lateral views; basal diameter larger than that of laterobasal lobes. Dorsobasal surface near the ostium with a lobe smaller than the ventrobasal swelling. Gonopore protrusion probably present, but unsuccessfully inflated in the specimens examined.

Figures

Figure 3. External structures of Nebria taketoi and N. kobushicola sp. nov. A, E. N. taketoi holotype male from Mikurigaike; B, F, J. N. taketoi male from Murododaira; I. N. taketoi female from Murododaira; C, G, K. N. kobushicola holotype male from Mount Kobushigatake; D, H. N. kobushicola paratype male from Mount Aka; A-D. Habitus, in dorsal view; E-H. Pronotum, in dorsal view; I-K. Elytral base around the median line in dorsal (I, K) and left dorsolateral (J) views, showing the variation [present (yellow arrows) or absent (no arrow)] in setigerous puncture on stria 1.

Figure 4. Endophallus of Nebria taketoi. A-D. Male from Murododaira; E-H. Male from Mount Yukikuradake; I-K. Male from Renge-Onsen. Right lateral view (A, E, I), ventral view (B, F, J), dorsal view (C, G, K), and ventroapical view (D, H), showing a dorsal view of the dorsoapical lobe. Abbreviations: da. dorsoapical lobe, gp. gonopore protrusion, la. left lateroapical lobe, lb. left laterobasal lobe, ra. right lateroapical lobe, rb. right laterobasal lobe, vb. ventrobasal swelling. a 1 and a 2 denote apices of the dorsoapical lobe. Asterisk indicates that the gonopore protrusion or lobes is not fully everted.