Anillinus hildebrandti Sokolov, 2020

Sokolov, Igor M., 2020, Four new species of the genus Anillinus Casey (Coleoptera, Carabidae, Anillini) from Alabama, U. S. A., with a revised key to the Alabama species, Zootaxa 4808 (3), pp. 547-559 : 551-553

publication ID	https://doi.org/ 10.11646/zootaxa.4808.3.9
publication LSID	lsid:zoobank.org:pub:1A650979-86E0-4928-97CF-64D5FCDB53D1
DOI	https://doi.org/10.5281/zenodo.4328683
persistent identifier	https://treatment.plazi.org/id/A21A87EE-FFB9-E605-2998-FD82FB46F8E5
treatment provided by	Plazi
scientific name	Anillinus hildebrandti Sokolov
status	sp. nov.

Treatment

Anillinus hildebrandti Sokolov View in CoL , sp. n.

( Figs. 1C View FIGURE 1 , 2C View FIGURE 2 , 3C View FIGURE 3 , 4 View FIGURE 4 G–I, 5)

Type material. Holotype, one male ( CMNH), dissected, labeled: \ Cave Spring Cave , 9mis. E of Decatur , Morgan Co., Ala., June 19, 1939 Coll.A.B. Flanagan \ videt J.M. Valentine 1939 \ [handwritten] . Paratype, one male labeled: \ Cave Spring Cave , S. 4-6- 3 W. 9mi. e. s. e. Decatur, Morgan Co., Ala., Coll. W.B. Jones 6-16-‘39 \ [handwritten] .

Specific epithet. This species is named after Drew Hildebrandt, an Associate Professor of the Department of Surgery at the University of Mississippi Medical Center, Jackson, Mississippi, and an amateur carabidologist, recognizing his valuable input in investigation of biodiversity of the North American Bembidiini and Anillini .

Type locality. USA, Alabama, Morgan County, Cave Springs Cave .

Differential Diagnosis. Males of A. hildebrandti can be distinguished from those of the other congeners by the elongate, subparallel habitus together with the structure of the median lobe having copulatory sclerites of the distinctive shape and specific scaly field in the internal sac.

Description. Medium-sized for genus (ABL 1.61–1.68 mm, mean 1.64± 0.044 mm, n=2).

Habitus: Body form ( Fig. 1C View FIGURE 1 ) moderately convex, elongate (WE/ABL 0.35±0.002), head wide relative to pronotum (WH/WPm 0.79±0.012), pronotum moderately narrow in comparison to elytra (WPm/WE 0.80±0.027).

Integument: Body color rufo-testaceous, appendages testaceous. Microsculpture ( Fig. 2C View FIGURE 2 ) present over all dorsal surfaces: more pronounced on head and elytra, slightly weakened on pronotum, with isodiametric mesh pattern of polygonal sculpticells. Body surface shiny, surface sparsely and finely punctate, covered with sparse, yellowish, short setae. Vestiture of elytra moderately long (0.3–0.4 length of discal setae).

Prothorax: Pronotum ( Fig. 3C View FIGURE 3 ) moderately convex, of moderate size (LP/LE 0.43±0.030), slightly transverse (WPm/LP 1.14±0.023), with lateral margins moderately constricted posteriorly (WPm/WPp 1.25±0.005), with shallow sinuation before posterior angles. Anterior angles indistinct, posterior angles almost rectangular (95–100°). Width between posterior angles equals the width between anterior angles (WPa/WPp 0.99±0.021). Basal margin slightly concave in middle, slightly oblique at sides.

Scutellum: Externally visible, triangular, with narrowly rounded apex.

Elytra: Narrowly depressed along suture, with traces of 1–2 striae, of average length (LE/ABL 0.57±0.012) for genus, and slightly narrower than average width (WE/LE 0.61±0.010). Humeri distinct, rounded, in outline forming right angle with longitudinal axis of body. Lateral margins subparallel in middle, slightly divergent at basal forth, evenly rounded to apex in apical third, without subapical sinuation. Basal margination distinct.

Legs: Protarsi of male with moderately dilated tarsomere 1. Profemora moderately swollen. Metafemora unmodified.

Male genitalia: Median lobe ( Fig. 4G View FIGURE 4 ) of aedeagus anopic, slightly arcuate and slightly twisted. Shaft greatly dilated in apical half, with moderately elongate apex, conically tapered to rounded tip. Ventral margin of median lobe slightly enlarged, with many poriferous canals. Dorsal copulatory sclerites fused to form straight, subparallel blade-like sclerite, bifurcated basally and acute apically. Internal sac has a small scaly membranous field overlapping the blade-like sclerite in its apical half, and with scales oriented in dorsal direction. Spines of internal sac absent. Left paramere ( Fig. 4H View FIGURE 4 ) of shape common in genus, paramere apex with one seta. Right paramere ( Fig. 4I View FIGURE 4 ) elongate, with many (>10) long setae apically, which are equal to the length of paramere.

Geographic Distribution. This species is known only from one cave in the Morgan County, Alabama ( Fig. 5 View FIGURE 5 , yellow circle).

Habitat. According to the label, both specimens of this species were collected in the same cave within an interval of 5 years. Presumably it is a true cavernicolous species.

Relationships. It seems reasonable to place A. hildebrandti in one group with the species demonstrating similar shape of the median lobe, i.e., with the shaft dilated in the apical half, enlarged ventral margin, and conically tapered apex. Besides A. hildebrandti , this group includes A. clinei , new species, described above, A. cavicola Sokolov , and A. hirsutus Sokolov. The group has a compact range which is limited to four neighboring counties: Morgan, Marshall, Jackson, and Maddison, in the most north-central and northeastern parts of Alabama.