Anillinus erwini 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 : 213

Anillinus erwini Sokolov and Carlton , new species

( Figs. 5–6 , 26 , Map fig. 39)

Holotype ( USNM). Male labeled / USA: NC, Watauga Co., Rough Ridge Trailhead, 8 mi SW Blowing Rock, elv. 4,2009, 2.VI.1991 / LSAM0017672 / HOLOTYPE, Anillinus erwini Sokolov and Carlton , des. 2003/.

Paratypes (34, LSAM unless otherwise indicated). Three females with same locality data as holotype. Two females labeled / USA: NC , McDowell Co., Deerlick Gap.Overlook , elv. 3,5009, B. R . Pkw. 2.2 mi SW intersect.221, 2. VI .1991, C.E.Carlton/; 4 females labeled / USA: NC , Yancy Co., B. R . Pkw. , 37.4 mi SW intersection US 221, elv. 4,6009, log litter, 2. VI .1991, C.Carlton/; 6 males and 3 females labeled / Avery Co., NC , V-4 1973, Tom Daggy (also with numbers 6586–6594 on separate labels) ( NCSU) ; 1 male and 6 females labeled / Grandfather Mt. , NC , IV-30 1955, Tom Daggy (also with numbers 2310–2316 on separate labels) ( NCSU) /; 2 males and 4 females labeled / USA: VA, Grayson Co., Grayson Highlands St.Pk. , picnic area near visitors center, Berlesate, 3. VI .1991, C.E.Carlton/; 1 male and 2 females labeled / USA: VA, Wash. Co., E. of Damascus , leaf litter, 3. VI .1991, C.E.Carlton/.

Specific Epithet. This species is named after Terry Erwin (Smithsonian Institution, Washington, DC) in honor of his contributions to carabid systematics and studies of beetle diversity.

Description. Medium-sized for genus (ABL range, 1.63–1.91 mm; mean 1.77 mm, n ¼ 19). Habitus markedly convex, ovoid (WE/ABL, 0.39), head of moderate size (WH/WPm, 0.75), elytra relatively wide (WPm/WE, 0.78). Color of body various, from brunneous to brunneorufous, appendages testaceous. Head ( Fig. 5 ) without microsculpture in two paralateral areas at vertex that are confluent at the middle of frons, this area often extended over central parts of frons, where microsculpture becomes indistinct. Dorsal microsculpture indistinct across pronotum, at most with traces of microlines throughout and polygonal meshes next to lateral margins.

Pronotum ( Fig. 6 ) moderately convex and transverse (WPm/LP, 1.29), with margins moderately and rectilinear convergent towards base (WPm/WPp, 1.28) (some specimens from Virginia have shallow sinuation before the posterior angles). Anterior angles evident, slightly prominent. Posterior angles slightly obtuse (100–1108). Width between posterior angles approximately equal to width between anterior angles (WPa/WPp, 0.97).

Elytra markedly convex, slightly depressed along suture, length normal for genus (LE/ABL, 0.57), with traces of 1–2 interneurs. Humeri moderately prominent, slightly rounded. Vestiture of elytra short (less than one-quarter length of discal setae).

Males with metafemora slightly, evenly enlarged at middle.

Median lobe ( Fig. 26 ) evenly arcuate with simple acuminate apex. Internal sac with dorsal copulatory sclerite forming long, filament-like structure, the apex extending beyond the internal sac; ventral sclerite and spines of internal sac absent.

Distribution. Known from a large area north of the French Broad River in North Carolina, north to the southwestern counties of Virginia ( Fig. 39).

Habitat. Specimens were collected in Berlese samples taken in moist hardwood forests.

Differential Diagnosis. Anillinus erwini is a single member of ovoid species with patches of effaced microsculpture on the head and smooth pronotum ( Table 2, group VI of litter species).

Anillinus erwini occurs sympatrically with A. fortis (Horn) and possibly with A. virginiae in the northern part of its range. It differs from both species in having microsculpture effaced on the pronotum and also by the microsculpture more effaced on the head.

Figures

Figs. 1–5. Anillinus spp. 1) Anillinus fortis (Horn), dorsal aspect, scale ¼ 1.0 mm. 2–7) Dorsal aspects of heads, showing microsculpture, scale ¼ 0.2 mm. 2) Anillinus magazinensis n. sp.; 3) A. fortis (Horn); 4) A. robisoni n. sp.; 5) A. erwini n. sp.

Figs. 6–9. Pronota of Anillinus spp., scale ¼ 0.3 mm. 6) Anillinus erwini n. sp.; 7) A. fortis

Figs. 25–31. Aedeagi of Anillinus spp., right lateral aspects, scale ¼ 0.1 mm. 25) A. docwatsoni n. sp.; 26) A. erwini n.sp.; 27) A. folkertsi n.sp.; 28) A. kovariki n.sp.; 29) Anillinus langdoni n.sp.; 30) A. lescheni n. sp.; 31) A. loweae n.sp.