Anillinus bexarensis, Sokolov, 2022

Sokolov, Igor M., 2022, Two new cavernicolous species of Anillinus Casey (Carabidae, Trechinae, Anillini) from Texas with a revised key to Texas species, Subterranean Biology 44, pp. 153-166 : 153

Anillinus bexarensis sp. nov.

Figs 1 , 2 , 5C

Type material.

Holotype: male, deposited in NMNH, card-mounted, dissected, labeled: \ USA-TX: Bexar Co., Up the Creek Cave, 29.631433°N 98.559079°W, 12 Mar 2020, J. Owen, UTIC#246598 \ HOLOTYPE Anillinus bexarensis Sokolov, 2022 [red label].

Paratypes (8 specimens, deposited in NMNH and TMM). One fe-male, labeled same as holotype, except UTIC#246599 \; 1 male, labeled same as holotype, except, 25 Feb 2020, J. Owen, A. Jensen, UTIC#246585 \; 1 male, labeled same as holotype, except 5 Mar 2020, J. Owen, UTIC#246593 \, 1 female (pronotum broken, ovipositor sclerites and spermatheca lost), labeled: \ TX: Bexar Co., Up the Creek Cave, 14.XI.1995, J. Cokendolpher, J. Reddell, M. Reyes \ Texas Memorial Museum Invertebrate Zool Coll #27.141 \; 2 females labeled: \ TEXAS: Bexar Co., Constant Sorrow Cave, 29.63554°N 98.58514°W, 20 Jan 2020, K. McDermid, L. Pustka, UTIC#246580 \; 1 female labeled: \ TEXAS: Bexar Co., Constant Sorrow Cave, 29.63554°N 98.58514°W, 31 Jan 2020, K. McDermid, L. Pustka, UTIC#246564 \; 1 female labeled: \ TEXAS: Bexar Co., Constant Sorrow Cave, 29.63554°N 98.58514°W, 19 Mar 2020, J. Owen, UTIC#246623 \.

Additional material.

One female (in poor condition, only head, pronotum and abdominal ven-trites present, ovipositor sclerites and spermatheca lost), deposited in CAS, labeled: \Zara-3873: TX: Bexar Co., Holy Smoke Cave, 10.XII.2008, P. Sprouse, S. Zappitello \.

Etymology.

The specific epithet is a Latinized adjective in the masculine form based on the name of Bexar County, from which the new species is described.

Type locality.

U.S.A., Texas, Bexar County, San Antonio, Eisenhower Park area, Up the Creek Cave, 29.631433°N, 98.559079°W.

Recognition.

Females of A. bexarensis are practically indistinguishable from those of other Texas species of subterranean Anillinus . Males of A. bexarensis are distinguished from those of the other Texas species by the structure of the median lobe.

Description.

Medium-sized for genus (SBL range 1.68-1.88 mm, mean 1.78 ± 0.082 mm, n = 7).

Habitus. Body form (Fig. 1A ) subdepressed, subparallel, markedly elongate (WE/SBL 0.37 ± 0.009), head (Fig. 1B ) large for genus compared to pronotum (WH/WPm 0.76 ± 0.0207), pronotum wide in comparison to elytra (WPm/WE 0.82 ± 0.020).

Integument. Body rufobrunneous, appendages testaceous. Microsculpture distinct over all dorsal surfaces of head, pronotum and elytra, with isodiametric polygonal meshes.

Head. Labium with mental tooth; mentum and submentum separated by suture.

Prothorax. Pronotum (Fig. 1C ) relatively long (LP/LE 0.39 ± 0.017) and transverse (WPm/LP 1.31 ± 0.017), with lateral margins shallowly sinuate and moderate-ly constricted posteriorly (WPm/WPp 1.28 ± 0.026). Anterior angles indistinct, poste-rior angles nearly rectangular (95-105°). Width between anterior and posterior angles of approximately equal length (WPa/WPp 0.99 ± 0.035). Basal margin slightly concave.

Elytra (Fig. 1A ). Slightly and widely depressed along suture, of normal length (LE/SBL 0.59 ± 0.013) and narrow for genus (WE/LE 0.62 ± 0.021), with traces of 5-6 striae. Humeri distinct, rounded, in outline forming obtuse angle with longitudinal axis of body. Lateral margins subparallel, slightly divergent at basal fifth, 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 truncate with distinct sutural angle.

Legs. First male protarsomere markedly dilated apico-laterally with two rows of adhe-sive setae ventrally. Male hind legs modified: metafemora triangularly dilated along posteroventral margin with a small tooth at tip of dilation.

Male genitalia. Median lobe of aedeagus (Fig. 2A ) with short basal lobe, long almost rectangularly bent shaft, and with apex enlarged and bent upwards, narrowly rounded at tip. Apical half of shaft with dorsal protuberance only slightly protruded beyond the general contour of the shaft (Fig. 2A , dp). Dorsal margin narrowly sclerotized along almost all its length. Ventral margin enlarged in apical part, with numerous poriferous canals. Dorsal sclerite in the form of a semicircular stylus-like structure, with characteristic posterior basal prolongation (Fig. 2A , pbp). Scaly membranous field occupies almost entire apical third of the shaft, with numerous short spines basally and anteroventrally. Enlarged apical area of median lobe with a dark spine-like structure (Fig. 2a , ss). Left paramere (Fig. 2B ) wide, greatly enlarged basally, without long setae. Right paramere (Fig. 2C ) long and wide, with numerous (>8) long setae, their length approximately equal to the length of the para-mere.

Female genitalia. Ovipositor sclerites (Fig. 2E ) typical for Anillinus . Gonocoxite 2 unguiform, of moderate length, with slightly curved blade and narrowly rounded apex, with one nematiform and two ensiform setae. Later-otergite with 8-9 setae. Spermatheca with distal part of cornu abruptly dilated. Nodulus short, slightly sclerotized, ramus undifferentiated (Fig. 2D ). Spermathecal gland and spermathecal duct shorter than the length of the spermatheca.

Geographical distribution.

This species is known only from several caves located in Bexar County, Texas (Fig. 5C ).

Way of life.

This species has been found only in caves.

Relationships.

The presence of a dorsal protuberance on the shaft and the characteristic shape of the dorsal copulative sclerite of the median lobe put A. bexarensis together with two other Texan species of Anillinus , A. wisemanensis Sokolov and Kavanaugh and A. sinuatus Jeannel. The general outline of the median lobe and details of the armature of the apical part of the median lobe sug-gest that A. bexarensis is the closest relative of A. wisemanensis .

Figures

Figure 1. Digital images of external features of Anillinus bexarensis sp. nov. A habitus, dorsal aspect (female, Up the Creek Cave, Bexar County, Texas) B head, dorsal aspect (male, Up the Creek Cave, Bexar County, Texas) C pronotum, dorsal aspect (male, Up the Creek Cave, Bexar County, Texas). Scale bars: 1.0 mm (A); 0.2 mm (B-C).

Figure 2. Digital images and ink drawings of male and female genitalia of Anillinus bexarensis sp. nov. (Up the Creek Cave, Bexar County, Texas). Male genitalia: A median lobe, right lateral aspect; apex to upper left and basal bulb to lower right B left paramere, left lateral aspect C right paramere, right lateral aspect. Female genitalia: D spermatheca E ovipositor sclerites. dp-dorsal protuberance, pbp-posterior basal prolongation, ss-spine-like structure. Scale bars: 0.1 mm.

Figure 5. Distribution of the Anillinus species by county in central Texas A position of the region under question on the map of Texas B distribution of A. reddelli and its relatives C distribution of A. bexarensis and its relatives. Non-rectangular heavy black contour on state map shows the genus range in Texas. Stars on insets indicate counties where new species were collected, color-filled counties on insets indicate ranges of the presumed relatives of the appropriate new species.