Anillinus chandleri Sokolov, 2011

Sokolov, Igor M., 2011, Five new species of Anillinus Casey from the Southern Appalachian Mountains and the Piedmont Plateau of eastern U. S. A. (Coleoptera: Carabidae: Trechinae: Bembidiini), Insecta Mundi 2011 (164), pp. 1-14 : 11-12

Anillinus chandleri Sokolov , new species

Figure 5 , 10 , 15 , 17

Holotype. Male labeled / USA: SC: Edge. Co., Ft. Sumter Nat. For. Jct. Rds. 235 and 139 / VII-8-1987 RM Reeves, sift. Forest litter/ Anillinus sp. det. Bell / HOLOTYPE, Anillinus chandleri Sokolov , des. 2009/. The holotype is dissected and bears a plastic rectangle with genitalia mounted in dimethylhydantoin formaldehyde resin. Deposited USNM .

Type locality. U.S.A. South Carolina, Edgefield County, Sumter National Forest, 33°37.20’N 82°5.55’W.

Etymology. This species is named for Donald S. Chandler, to honor his contributions to knowledge of the litter fauna of the eastern United States of America.

Description. Large for genus (ABL = 2.22 mm). Habitus ( Fig. 5 ) moderately convex, subparallel (WE/ ABL 0.38), head of normal proportions for the genus (WH/WPm 0.70), pronotum narrow compared to elytra (WPm/WE 0.81). Body color rufotestaceous, appendages testaceous. Dorsal microsculpture mostly effaced, polygonal meshes present only on a small triangular area at the middle of vertex; other parts of head and pronotum with effaced microsculpture. Elytra with well-developed polygonal microsculpture.

Pronotum ( Fig. 9 ) moderately convex and of normal proportions for genus (WPm/LP 1.30), with margins rectilinear and narrowly constricted posteriad (WPm/WPp 1.23). Anterior angles evident, very slightly prominent. Posterior angles obtuse (115°). Width between posterior angles much greater than between anterior angles (WPa/WPp 0.86).

Elytra moderately convex, depressed along suture, slightly elongated (LE/ABL 0.54), with traces of 4 interneurs. Humeri rectangular and rounded. Margins subparallel, slightly divergent in basal forth, evenly rounded to apex in apical third, maximal width of elytra at midpoint. Elytra without subapical sinuation. Vestiture of elytra short (lesser than one-third of discal setae).

Prothoracic leg of males with moderately dilated tarsomere 1. Profemur moderately swollen. Metafemora unmodified. Sternum VII of males unmodified.

Median lobe of aedeagus ( Fig. 15a ) evenly arcuate and slightly twisted, with small rounded apex. Ventral margin of median lobe not enlarged with only few poriferous canals. Dorsal copulatory sclerites forming an elongate, curled filament-like structure with a wide base. Most part of distal sclerites concealed by two rows of long spines occupying the apical half of the median lobe and directed ventrally. Also a group of three small spines, directed dorsally, is located beneath the long spines, ahead the base of dorsal sclerites. Ventral sclerite of internal sac absent. Left paramere ( Fig. 15b ) not enlarged, paramere apex with three poriferous canals, but bearing only one small seta in distal position. Right paramere ( Fig. 15c ) short, with subparallel apical portion, bearing four long setae that are longer than the paramere itself.

Distribution. Known only from Sumter National Forest, Edgefield County, South Carolina near the Georgia border ( Fig. 17 ).

Habitat. A single male was collected by sifting forest litter.

Differential diagnosis. Based on external characters, A. chandleri belongs to the valentinei-group of species characterized by effaced microsculpture on the foreparts and presence of a spine cluster on the inner sac. Because the Anillina fauna of the Piedmont of the Carolinas and Virginia is still poorly known, the exact position of the species within the genus can be determined only after thorough investigations of the region. Probably, the closest known relative of A. chandleri is A. cornelli Sokolov and Carlton , which also occurs in the Piedmont area along the North Carolina / South Carolina border. Both species share the same microsculpture pattern, but differ greatly in the internal sac architecture. In A. chandleri , the dorsal sclerites are hidden by many long spines, whereas in A. cornelli the spines are absent and the dorsal sclerites are clearly visible. Below those, three apically sclerotized tubercles which might represent homologues of the spines of A. chandleri , are located. Also, A. chandleri (2.22 mm in length) is comparatively larger than A. cornelli (1.61-2.08 mm).

Anillinus chandleri is apparently allopatric with respect to other described species of Anillina . The nearest records for other species are known from about 140 km to the north ( A. loweae , A. cherokee and A. cornelli ) and to the west ( A. turneri ).

Figures

Figure 17. Locality records for the valentinei-group and cornelli-group species. Anillinus valentinei – red triangle; A. smokiensis – red quadrangle; A. chandleri – red star; A. cornelli – red circles.

Figure 1-5. Habitus images. 1) Anillinus unicoi (NC, Graham Co., Unicoi Mtns.), holotype. 2) A. carltoni (TN, Blount Co., GSMNP, Thunderhead Mtn.), paratype. 3) A. chilhowee (TN, Polk Co., Chilhowee Mtn.), holotype. 4) A. smokiensis (TN, Blount Co., GSMNP), paratype. 5) A. chandleri (SC, Edgefield Co., Sumter National Forest), holotype.

Figure 6-10. Pronotum images. 6) Anillinus unicoi (NC, Graham Co., Unicoi Mtns.). 7) A. carltoni (TN, Blount Co., GSMNP, Thunderhead Mtn.). 8) A. chilhowee (TN, Polk Co., Chilhowee Mtn.). 9) A. smokiensis (TN, Blount Co., GSMNP). 10) A. chandleri (SC, Edgefield Co., Sumter National Forest).

Figure 11-15. Illustrations of male aedeagus. 11) Anillinus unicoi (NC, Graham Co., Unicoi Mtns.). 12) A. carltoni (TN, Blount Co., GSMNP, Thunderhead Mtn.). 13) A. chilhowee (TN, Polk Co., Chilhowee Mtn.). 14) A. smokiensis (TN, Blount Co., GSMNP). 15) A. chandleri (SC, Edgefield Co., Sumter National Forest). a-Median lobe, right lateral aspect; b-Left paramere, left lateral aspect; c-Right paramere, right lateral aspect. Scale = 100 µm.