Anillinus humicolus 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 : 553-555

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.4328691
persistent identifier	https://treatment.plazi.org/id/A21A87EE-FFBB-E60B-2998-F899FDDDF9EE
treatment provided by	Plazi
scientific name	Anillinus humicolus Sokolov
status	sp. nov.

Treatment

Anillinus humicolus Sokolov View in CoL , sp. n.

( Figs. 1D View FIGURE 1 , 2D View FIGURE 2 , 3D View FIGURE 3 , 4 View FIGURE 4 J–L, 5)

Type material. Holotype, one male ( CMNH), dissected, labeled: \ ALABAMA: Jefferson Co. Cherokee Bend, Mountain Brook nr Birmingham, T. N.King, July 10 1971 \ [computer printed] \ THOMAS C. BARR COLLEC- TION 2001 ACC. No. 38,014 \ [computer printed] \ 7/10/71 M B \ [handwritten].

Specific epithet. Species name originates from the Latin adjective “ humicolus ” meaning “soil-dwelling”, and refers to the presumable habitat of the new species.

Type locality. USA, Alabama, Jefferson County, Mountain Brook (suburb of Birmingham) .

Differential Diagnosis. Males of A. humicolus can be distinguished from those of the other congeners by the effaced microsculpture on the head and pronotum, and the structure of the median lobe with numerous big spines in the internal sac.

Description. Medium-sized for genus (ABL 1.88 mm).

Habitus: Body form ( Fig. 1D View FIGURE 1 ) moderately convex, elongate ovoid (WE/ABL 0.38), head wide relative to pronotum (WH/WPm 0.74), pronotum moderately narrow in comparison to elytra (WPm/WE 0.81).

Integument: Body color brunneo-piceous, appendages testaceous. Microsculpture greatly reduced; head and pronotum without microsculpture except small triangular area at the middle of vertex with several polygonal meshes ( Fig. 2D View FIGURE 2 ); elytra with well-developed polygonal microsculpture. 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. 2D View FIGURE 2 ) moderately convex, of moderate size (LP/LE 0.40), moderately transverse (WPm/LP 1.32), with lateral margins slightly and rectilinearly constricted posteriorly (WPm/WPp 1.18). Anterior angles indistinct, posterior angles slightly obtuse (110°). Width between posterior angles much greater than between anterior angles (WPa/WPp 0.88). Basal margin slightly concave in middle.

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

Elytra: Narrowly depressed along suture, with traces of 1–2 striae, of length (LE/ABL 0.58) and width (WE/LE 0.66) average for genus. Humeri distinct, rounded, in outline forming right angle with longitudinal axis of body. Lateral margins subparallel in middle, slightly divergent at basal fifth, 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. 4J View FIGURE 4 ) of aedeagus anopic, slightly arcuate and slightly twisted. Shaft elongate, subparallel, with elongate subparallel apex, with rounded tip. Ventral margin of median lobe straight, not enlarged, without poriferous canals. Dorsal copulatory sclerites in form of fused, intertwining blade-like structures slightly widening basally, shaped like an arc with ends facing dorsally, and situated at the middle of shaft. Between dorsal sclerites and apical orifice internal sac has a scaly membranous field with a group of eleven big spines. Left paramere ( Fig. 4K View FIGURE 4 ) of shape common in genus, paramere apex with two short setae. Right paramere ( Fig. 4L View FIGURE 4 ) short, with four long setae apically, which are equal to the length of paramere.

Geographic Distribution. This species is known only from Jefferson County, Alabama ( Fig. 5 View FIGURE 5 , black diamond).

Habitat. The label does not contain any information about subterranean habitat or about any other habitat. Presumably this species is not a cavernicolous species.

Relationships. Based on the structure of the median lobe, A. humicolus is a sister species to the cavernicolous A. valentinei Barr (cf. Fig. 6G View FIGURE 6 , page 68 in Sokolov 2012). The latter is known to occur in Jefferson County, where it was documented from Crystal Caverns ( Peck 1995; Sokolov 2012) situated approximately 16 miles to the NE of the type locality of A. humicolus .