Anillinus pusillus Sokolov and Carlton

Sokolov, Igor M., Sokolova, Yuliya Y. & Carlton, Christopher E., 2007, New species of Anillinus Casey (Carabidae: Trechinae: Bembidiini) from Great Smoky Mountains National Park, U. S. A. and phylogeography of the A. langdoni species group, Zootaxa 1542, pp. 1-20 : 8-11

publication ID	https://doi.org/ 10.5281/zenodo.177878
DOI	https://doi.org/10.5281/zenodo.5632286
persistent identifier	https://treatment.plazi.org/id/AD598786-FFBB-FF9C-FF55-F9AFE2ABFBD8
treatment provided by	Plazi
scientific name	Anillinus pusillus Sokolov and Carlton
status	sp. nov.

Treatment

Anillinus pusillus Sokolov and Carlton View in CoL sp.nov.

Holotype. Male labeled / N Carolina: Swain Co. , GSMNP, Twentymile Tr., 35°28.8’N 83°50.7’W. 690m. Leaf litter sifting. 28 July 2004 W.D.Merrit / / HOLOTYPE, Anillinus pusillus Sokolov and Carlton , des. 2007/. Deposited USNM.

Type locality. U.S. A, NC, Swain Co., Great Smoky Mountains National Park, Twentymile Trail, 35°28.8’N 83°50.7’W.

Paratypes (57). Nine males and 5 females with the same collection data labels as holotype; 4 males and 10 females labeled / N Carolina: Swain Co. , GSMNP, Lost Cove Tr., 35°29.45’N 83°48.1’W. 685m. Leaf litter sifting. 8 May 2004 W.D.Merrit /; 1 male labeled / N Carolina: Swain Co. , GSMNP, Appalach. Tr., just below Ekaneetlee Gap, 35°32.30’N 83°48.37’W. 1155m. Litter sifting. 12 April 2006 A. K. Tishechkin /; 6 males labeled / N Carolina: Swain Co. , GSMNP, upper Eagle Creek Tr. at 35°33.03’ N 83°43.98’ W, 1165m. Litter sifting. 14 April 2006 A.K. Tishechkin /; 5 males and 6 females labeled / Tennessee: Blount Co., GSMNP, lower Gregory Ridge Tr., 35°33.5’ N 83°50.5’W. elev. 630m. Leaf litter sifting 28 July 2004 A. Tishechkin /; 2 males and 2 females labeled / TN: Blount Co., GSMNP, Gregory Bold, W slope at 35°31.222’N 83°52.046’W, mixed forest, 1490m, berlese Gusarov V. 18.06.2006 /; 5 males and 2 females labeled / TN, Blount Co., GSMNP, left slope to Forge Crk., nr Gregory Ridge Tr., 640m, 35°33.345’ N 83°50.398’ W, mixed hardwood, hand sift. Sokolov I.M. 13 Sep 2006 /. Deposited LSAM.

Etymology. The specific epithet " pusillus " (Latin, “tiny, little, petty, insignificant") is an adjective referring to the small size of the beetle.

Description. Small to medium-sized for genus (ABL range 1.42–1.72mm, mean 1.60± 0.087 mm, n=20). Habitus ( Fig. 2 View FIGURES 1 – 2 ) markedly convex, ovoid (WE/ABL 0.38±0.013), head normally proportioned for genus (WH/ WPm 0.74±0.020), pronotum narrow compared to elytra (WPm/WE 0.77±0.017). Body color brunneus to brunneorufous, appendages lighter, testaceous. Microsculpture distinct across dorsal surface of head and pronotum.

Pronotum moderately convex and transverse (WPm/LP 1.24±0.029), with margins rectilinear and slightly constricted posteriad (WPm/WPp 1.27±0.023). Anterior angles evident, slightly prominent. Posterior angles slightly obtuse (103–109°). Width between posterior angles greater than between anterior angles (WPa/WPp 0.96±0.027).

Elytra markedly convex, slightly depressed along suture, of normal length for genus (LE/ABL 0.58±0.015), with traces of 1–2 interneurs. Humeri ( Fig. 4 View FIGURES 3 – 6 ) moderately prominent, in outline forming right angle with longitudinal axis of body, slightly rounded, thence parallel towards middle of elytra. Margins subparallel in basal half, evenly rounded to apex at apical third of elytra, maximum width near middle, approximately at 0.45–50 of elytral length. Elytra without subapical sinuation. Vestiture of elytra short (less than onefourth length of discal setae).

Foreleg of males with slightly dilated tarsomere 1 (as in Fig. 8 View FIGURES 7 – 10 ) and moderately swollen (as in Fig. 12 View FIGURES 11 – 14 ) profemur. Metafemora unmodified.

Median lobe ( Fig. 16 View FIGURES 15 – 18 a) evenly arcuate, with normally proportioned rounded apex not enlarged along ventral margin and with few poriferous canals. No canals on walls of median lobe. Copulatory pieces consisting of semicircularly curved dorsal sclerites, together forming a single curve. Base of copulatory pieces forming one long sclerotized prolongation. Ventral sclerite and spines of internal sac absent.

Left paramere ( Fig. 16 View FIGURES 15 – 18 b) not enlarged, bearing four setae, apical seta longest. Right paramere ( Fig. 16 View FIGURES 15 – 18 c) not enlarged or elongate, bearing four setae of equal length, spaced evenly across apex of paramere.

Spermatheca ( Fig. 20 View FIGURES 19 – 22 ) weakly sclerotized, in the form of a question mark, represented mostly by long, well-developed curved cornu. Distal part of cornu short, length less than 1.5 X width. Ramus reduced and undifferentiated, nodulus short. Spermathecal duct more or less straight, without obvious coils.

Stylomers and sternum IX as in Fig. 24 View FIGURES 23 – 26 .

Distribution. Known from south-western Blount County, Tennessee, and from Swain County, North Carolina, adjacent to the state line with Tennessee to near the junction of Blount and Sevier Co., TN, within GSMNP.

Habitat. Beetles were collected in litter of different types of forests: pine, xeric and mesic oak, cove and northern hardwoods from low to middle elevations of the Smoky Mountains (600–1400m).

Differential diagnosis. Anillinus pusillus is an ovoid species with complete, extensive microsculpture on foreparts of the body. The species differs from A. langdoni and A. cieglerae by its subparallel body form. Also, males of Anillinus pusillus can be distinguished from all other species in the langdoni – group by the form of the aedeagus. Females of this species are indistinguishable from A. langdoni , though locality data are helpful in separating these allopatric species. Females of A. pusillus can be distinguished from A. cieglerae by examination of spermatheca.

Anillinus pusillus occurs sympatrically with at least three species of Anillinus of different lineages. From other Anillinus species outside the langdoni – group it can be distinguished by the extensively microsculptured foreparts of the body and by the small size.