Anillinus sinuatus (Jeannel)

Sokolov, Igor M., Reddell, James R. & Kavanaugh, David H., 2014, Life beneath the surface of the central Texan Balcones Escarpment: genus Anillinus Casey, 1918 (Coleoptera, Carabidae, Bembidiini): new species, a key to the Texas species, and notes about their way of life and evolution, ZooKeys 417, pp. 71-101 : 87-88

Taxon classification Animalia Coleoptera Carabidae

Anillinus sinuatus (Jeannel) Figs 1B, 5B, 6 D–F, 8

Anillodes sinuatus Jeannel 1963a: 57. Holotype, a female, deposited in NMNH, glued on cardboard and labeled as in Fig. 1B.

Anillinus sinuatus (Jeannel), Bousquet 2012

Recognition.

Adults of Anillinus sinuatus are distinguished from those of other Texan species of the genus by the following combination of external characters: large size, pronotum with long and shallow basilateral sinuations and microsculpture on pronotum much finer than on head and elytra; and males are further distinguished by the minute spine on the posterior edge of metafemora and shape of the median lobe.

Redescription.

Medium-sized for genus (SBL range 1.81-1.84 mm, mean 1.83 ± 0.019 mm, n=2).

Habitus. Body form (Fig. 1B, 5B) subdepressed, subparallel, slightly elongate (WE/SBL 0.37 ± 0.007), head normally proportioned for genus (WH/WPm 0.77 ± 0.009), pronotum rather narrow in comparison to elytra (WPm/WE 0.81 ± 0.008).

Color. Body rufotestaceous, appendages testaceous.

Microsculpture. Distinct over all dorsal surfaces of head and elytra. Pronotum with much finer microsculpture, almost indistinct on disc and only at certain angles.

Prothorax. Pronotum of normal length (LP/LE 0.40 ± 0.004) and slightly transverse for genus (WPm/LP 1.31 ± 0.019), lateral margins with long and shallow sin uation before posterior angles, moderately constricted posteriorly (WPm/WPp 1.33 ± 0.024). Anterior angles indistinct, posterior angles nearly rectangular (90-100°). Width between anterior and posterior angles of approximately equal length (WPa/WPp 1.03 ± 0.020). Basal margin almost straight.

Elytra. Widely depressed along suture, of normal length (LE/SBL 0.58 ± 0.008) and typical width for genus (WE/LE 0.64 ± 0.003), with traces of 5-6 striae. Humeri distinct, rounded, in outline forming right angle with longitudinal axis of body. Lateral margins subparallel, slightly divergent at basal fourth, evenly rounded to apex in apical fourth, without subapical sinuation. Vestiture of elytra short (less than one-third length of discal setae). Apex of elytron rounded.

Legs. Male protarsomere 1 markedly dilated apico-lateraly with rows of adhesive setae ventrally. Male hind legs modified: metafemora with minute tooth at middle along posteroventral margin.

Abdomen. Abdominal ventrites of males unmodified.

Male genitalia. Median lobe of aedeagus (Fig. 6D) with short basal lobe, long curved shaft, and enlarged apex, broadly rounded at tip. Dorsal margin strongly sclerotized along almost all its length, with rather large protuberance directed backwards and situated before apical orifice. Ventral margin enlarged only apically, where it bears numerous poriferous canals. Dorsal sclerite in form of a semicircular blade-like structure with short basal prolongations. Without distinct ventral sclerites. Dorsal membraneous field with two very small spines located dorsally from dorsal sclerite. Enlarged apical area of median lobe with a dark spine-like structure. Right paramere slightly enlarged, long, of moderate width with numerous (>8) long setae (Fig. 6F), their length shorter than length of paramere. Left paramere enlarged apically and basally, where it forms a translucent convex keel (Fig. 6E), without long setae.

Female genitalia. Not investigated.

Geographical distribution.

This species is known only from Bexar County, Texas (Fig. 8, black quadrangle), in the vicinity of the Balcones Fault Zone. In addition to the holotype, we have examined a total of 2 specimens (one male and the fragmentary remains of one female): one male (dissected), in NMNH, labeled: \ BexarCo. Tex. May 5 1938 T-11135 38-8191 \ From soil of peach orch. \ T-11135 \ USNM \ Anillinus sinuatus n. sp R. Jeannel det., 19 \ Anillodes sinuatus J. det. T.L.Erwin 96 \; one female (presumably the same species, represented only by two legs [right middle and hind legs]) on points, in NMNH, labeled: \ Bexar Co. Tex. Feb. 9. 1938 T-9056 38-2676 \ From soil of peach orchard \ T-9056 \ USNM \.

Way of life.

All specimens at hand were extracted from soil during sampling surveys in peach orchards.

Relationships.

The armature of the internal sac and the presence of the dorsal protuberance on the median lobe suggest a close relationship with Anillinus wisemanensis , described below.