Anillinus cornelli Sokolov and Carlton

Sokolov, Igor M., Carlton, Christopher & Cornell, James F., 2004, Review of Anillinus, with Descriptions of 17 New Species and a Key to Soil and Litter Species (Coleoptera: Carabidae: Trechinae: Bembidiini), The Coleopterists Bulletin 58 (2), pp. 185-233 : 209-210

publication ID	https://doi.org/ 10.1649/611
DOI	https://doi.org/10.5281/zenodo.5398737
persistent identifier	https://treatment.plazi.org/id/845C8783-1258-FE18-5E0C-FCCEFED7FA9B
treatment provided by	Tatiana
scientific name	Anillinus cornelli Sokolov and Carlton
status	sp. nov.

Treatment

Anillinus cornelli Sokolov and Carlton View in CoL , new species

( Fig. 23 View Figs , Map fig. 42)

Holotype ( USNM). Male labeled / NC Gaston Co. Crowders Mt St Pk 23 VI82 JF Cornell pine log litter 982 VI23-3 / HOLOTYPE, Anillinus cornelli Sokolov and Carlton , des. 2004/.

Paratypes (11). Three males and 1 female, same data as holotype; 1 male labeled / SC York Co nr Kings Mt Kings Mt St Pk 20 V 72 JF Cornell / ( JFC); 1 male labeled / SC York Co Kings Mt St Pk nr Kings Mt 9 I 83 JF Cornell Ulogs stones stream Debr 983-I-9-2C/; 5 males labeled / SC York Co Kings Mt St Pk Oct 28, 89 JF Cornell 989- X-28-3/ ( JFC) .

Specific Epithet. The species is named after Jim Cornell, collector of the type series and many other specimens of the genus.

Description. Medium-sized for genus (ABL range, 1.61–2.08 mm, mean, 1.90 mm, n ¼ 10). Habitus moderately convex, ovoid (WE/ABL, 0.38); head normally proportioned for genus (WH/ WPm, 0.80); pronotum and elytra relatively narrow (WPm/WE, 0.75). Color of body brunneus, appendages testaceous. Microsculpture of head limited to small triangular area at middle of vertex and frontal impressions, absent from disc of pronotum.

Pronotum moderately convex, and transverse (WPm/LP, 1.16), with margins rectilinear and slightly constricted posteriad (WPm/WPp, 1.10). Anterior angles evident, slightly prominent. Posterior angles slightly obtuse (1058). Width between posterior angles slightly greater than width between anterior angles (WPa/WPp, 0.91).

Elytra moderately convex, moderately depressed along suture, of normal length for genus (LE/ ABL, 0.54), with traces of 2–3 interneurs. Humeri moderately prominent, slightly rounded. Vestiture of elytra relatively short (less than one-fourth the length of the discal setae).

Males with metafemora simple.

Median lobe ( Fig. 23 View Figs ) arcuate, twisted, with small, narrowly rounded apex. Internal sac with copulatory pieces of dorsal and ventral sclerites. Dorsal sclerite strongly arched near midpoint of median lobe, apex extending far beyond internal sac when fully extended. Ventral sclerite formed from three elongate subapical tubercles.

Distribution. This species is known from two nearby localities in Gaston County, North Carolina (Crowders Mountain State Park) and York County, South Carolina (Kings Mountain State Park) ( Fig. 42 View Fig ).

Habitat. The holotype was collected in pine log litter.

Differential Diagnosis. Anillinus cornelli is ovoid in form without microsculpture on the forebody ( Table 2, group VIII of litter species). It is distinguished from all other species in this group (for which males are known) by the form of the median lobe and armature of the internal sac.

This species is apparently allopatric with respect to other described species of Anillinus and likely is sympatric with at least one species of Serranillus . From A. loweae it differs by the absence of microsculpture at the disc of pronotum and in lacking head microsculpture, except a small triangle at the middle of the vertex, and by the distinctive aedeagus. Anillinus cornelli is similar to A. murrayae in habitus and the general shape of the main dorsal copulatory sclerite of the aedeagus and may represent its allopatric sister taxon. In A. cornelli that structure is more strongly arched and elongate than it is in A. murrayae . Also, the accessory aedeagal sclerites of the two species are quite different, with A. cornelli lacking the ventral blade-like sclerite and clusters of spines. Anillinus cornelli also differs in having the male metafemora not expanded (i.e., evenly convex along posterior margin) and the tubercles along the posterior margin are much smaller and are visible only under very high magnification and strong illumination.