Anillinus reddelli, 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 reddelli sp. nov.

Figs 3 , 4 , 5B

Type material.

Holotype: male, deposited in NMNH, card-mounted, dissected, labeled: \ USA-TX: Williamson Co., SW Bypass Cave, No 1, TMM # 91,549, Kemble White, 12 Oct 2016 \ HOLOTYPE Anillinus reddelli Sokolov des., 2022 [red label].

Paratypes (2 specimens, deposited in NMNH and TMM). One fe-male, dissected, labeled: \ USA-TX: Williamson Co., Beck Horse Cave, TMM # 91,543, Kemble White, 4 Mar 2015 \; 1 male, dissected, labeled: \ TEXAS: Williamson Co., Glenna Mae’s Cave, TMM # 91,592, Kemble White, 5 Jun 2015 \.

Additional material.

One male (aedeagus lost), deposited in CAS, labeled: \ TX: Williamson Co., Lobo’s Lair, 13.IX.1991, J. Reddell & M. Reyes \ Texas Memorial Museum In-vertebrate Zool Coll #27.142 \; one female, deposited in CAS, labeled: \ TX: Williamson Co., Lobo's Lair , 1.IX.1991, W. Elliot, J. Reddell, M. Reyes, M. Warton \ Texas Memorial Museum Invertebrate Zool Coll #27.126 \.

Etymology.

The specific epithet is a Latinized eponym in the genitive case and is based on the surname of James R. Reddell, Curator Emeritus of Cave Invertebrates Collection at the University of Texas at Austin, TEXAS, U.S.A., a participant of many speleological expeditions, outstanding explorer of cave fauna, and a collector of a great number of troglobitic invertebrates, including numerous taxa new to science.

Type locality.

U.S.A., Texas, Williamson County, SW Bypass Cave.

Recognition.

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

Description.

Medium-sized for genus (SBL range 1.53-1.83 mm, mean 1.67 ± 0.147 mm, n = 3).

Habitus. Body form (Fig. 3A ) subdepressed, subparallel, markedly elongate (WE/SBL 0.36 ± 0.004), head (Fig. 3B ) large for genus compared to pronotum (WH/WPm 0.77 ± 0.008), pronotum wide in comparison to elytra (WPm/WE 0.87 ± 0.005).

Integument. Body rufotestaceous, 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. 3A, C ) relatively long (LP/LE 0.42 ± 0.014) and transverse (WPm/LP 1.27 ± 0.015), with lateral margins shallowly sinuate and moderate-ly constricted posteriorly (WPm/WPp 1.28 ± 0.027). Anterior angles indistinct, poste-rior angles nearly rectangular (95-100°). Width between anterior and posterior angles of approximately equal length (WPa/WPp 0.99 ± 0.010). Basal margin slightly concave.

Elytra (Fig. 3A ). Slightly and widely depressed along suture, of normal length (LE/SBL 0.58 ± 0.015) and narrow for genus (WE/LE 0.62 ± 0.016), 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 of normal shape 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. 4A ) with short basal lobe, long rectangularly bent shaft, and with apex enlarged and bent upwards, tapering to angular tip. Dorsal margin strongly sclerotized along almost all its length. Ventral margin enlarged along entire length to basal orifice, with numerous poriferous canals. Dorsal sclerite in form of a semicircular flagellum-like structure, with characteristic anterior basal prolongation (Fig. 4A , abp). Scaly membranous field located between anterior basal prolongation and flagellum of dorsal sclerite. Apical area of shaft with a dark spine-like structure (Fig. 4A , ss). Left paramere (Fig. 4B ) wide, greatly enlarged basally, without long setae. Right paramere (Fig. 4C ) long and wide with numerous (>8) long setae, their length approximately equal two-thirds of the length of the para-mere.

Female genitalia. Ovipositor sclerites (Fig. 4E ) typical for Anillinus . Gonocoxite 2 unguiform, of moderate length, with slightly curved blade and acute apex, with one nematiform and two ensiform setae. Later-otergite with 8-9 setae. Spermatheca (Fig. 4D ) with distal part of cornu abruptly dilated. Nodulus short, slightly sclerotized, ramus undifferentiated. Spermathecal gland and spermathecal duct shorter than length of the spermatheca.

Geographical distribution.

This species is known only from several caves dis-tributed in Williamson County, Texas (Fig. 4B ).

Way of life.

This species has been found only in caves.

Relationships.

The absence of a dorsal protuberance on the shaft, and the characteristic design of the dorsal copulative sclerite of the median lobe place A. reddelli in one group with two other Texan species of Anillinus , A. forthoodensis Sokolov and Reddell and A. affabilis (Brues). The general shape of median lobe and details of its apical part sug-gest that A. forthoodensis is the closest relative of A. reddelli among the Texan congeners.

Figures

Figure 3. Digital images of external features of Anillinus reddelli sp. nov. A habitus, dorsal aspect (female, Beck Horse Cave, Williamson County, Texas) B head, dorsal aspect (male, SW Bypass Cave, Williamson County, Texas) C pronotum, dorsal aspect (male, SW Bypass Cave, Williamson County, Texas). Scale bars: 1.0 mm (A); 0.2 mm (B-C).

Figure 4. Digital images and ink drawings of male and female genitalia of Anillinus reddelli sp. nov. (SW Bypass Cave and Beck Horse Cave, respectively, Williamson 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. abp-anterior 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.