Anillinus gimmeli Sokolov & Carlton

Sokolov, Igor M. & Carlton, Christopher E., 2010, New species of Anillinus Casey (Carabidae: Trechinae: Bembidiini) from the Southern Appalachians and phylogeography of the A. loweae species group, Zootaxa 2502, pp. 1-23 : 11-13

publication ID	https://doi.org/ 10.5281/zenodo.195855
DOI	https://doi.org/10.5281/zenodo.5694151
persistent identifier	https://treatment.plazi.org/id/03E75129-5D52-FF5B-FF55-F94BFB46FE99
treatment provided by	Plazi
scientific name	Anillinus gimmeli Sokolov & Carlton
status	sp. nov.

Treatment

Anillinus gimmeli Sokolov & Carlton View in CoL , sp.n.

( Figs. 1 View FIGURES 1 – 9 , 10 View FIGURES 10 – 13 , 20 View FIGURES 20 – 27 , 28 View FIGURES 28 – 35 , 36 View FIGURE 36 , 37 View FIGURE 37 , 38 View FIGURE 38 , 39 View FIGURE 39 , Table 1 View TABLE 1 )

Type material. Holotype. Male labeled / USA – TN: Blount Co., GSMNP, White Oak Sink, nr “Blowing” cave, 35°38.1’ N 83°45.3’ W, 500m, u/rock, Gimmel M. 3 April 2007 / HOLOTYPE, Anillinus gimmeli Sokolov and Carlton , des. 2008/. The holotype is dissected and bears a plastic rectangle with genitalia mounted in dimethylhydantoin formaldehyde resin. Deposited U.S. National Museum ( USNM). Type locality. U.S. A, TN, Blount Co., Great Smoky Mountain National Park, White Oak Sink, 35°38.1’ N 83°45.3’ W. Paratypes (4). One male and one female with the same data as holotype; one male and one female labeled / USA – TN: Blount Co., GSMNP, White Oak Sink, nr “Blowing Cave” at 35°38.198’ N 83°44.905’ W, 500m, under limestone rock, Gimmel M. 20 March 2008 /. The last two specimens bear labels /Molecular voucher # 75/ and / Molecular voucher #76/ respectively. All specimens are dissected and bear a plastic rectangle with genitalia beneath the specimen as described for holotype. Deposited Louisiana State Arthropod Museum ( LSAM).

Etymology. This species is named for Matthew Gimmel, a specialist in Phalacridae , in honor of his efforts to document the beetle fauna of Great Smoky Mountains National Park. He is the only one who has ever collected the specimens of this new species to date.

Description. Medium for genus (ABL range 1.65–1.76 mm, mean 1.72± 0.050 mm, n=4). Habitus ( Fig. 1 View FIGURES 1 – 9 ) markedly convex, ovoid (WE/ABL 0.38±0.008), head normally proportioned for genus (WH/WPm 0.75±0.017), pronotum narrow compared to elytra (WPm/WE 0.77±0.026). Body color light, from rufotestaceous to testaceous, appendages testaceous. Dorsal microsculpture distinct, covering pronotum and head except for two paramedian patches on vertex without microsculpture. Elytra with well-developed polygonal microsculpture.

Pronotum moderately convex and comparatively elongate (WPm/LP 1.29±0.052), with margins rectilinear and moderately constricted posteriad (WPm/WPp 1.28±0.023). Anterior angles evident, slightly prominent. Posterior angles slightly obtuse (100–110°). Width between posterior angles only slightly greater than between anterior angles (WPa/WPp 0.96±0.013).

Elytra moderately convex, slightly depressed along suture, of normal length for genus (LE/ABL 0.56±0.015), with traces of 1–2 interneurs. Humeri rounded, oblique, in outline forming an obtuse angle with longitudinal axis of body. Margins subparallel, slightly divergent in basal half, evenly rounded to apex, maximal width of elytra at midpoint. Elytra without subapical sinuation. Vestiture of elytra short (less than one-third of discal setae).

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

Median lobe of aedeagus ( Fig. 10 View FIGURES 10 – 13 a) evenly arcuate and twisted, with apex slightly enlarged and rounded. Distinctive oblique fold extending from base of apex towards dorsal side of median lobe. Ventral margin of median lobe weakly enlarged bearing numerous poriferous canals, which are also present on walls of median lobe itself near middle. Dorsal copulatory sclerites forming an elongate, curled filament-like structure with long, characteristic basal prolongations. Ventral sclerite and spines of internal sac absent. Left paramere ( Fig. 10 View FIGURES 10 – 13 b) not enlarged, paramere apex with four poriferous canals, but bearing only two small setae in distal positions. Right paramere ( Fig. 10 View FIGURES 10 – 13 c) elongate, with subparallel apical portion, bearing four long setae that are longer than the apical part of paramere itself.

Spermatheca ( Fig. 20 View FIGURES 20 – 27 ) moderately sclerotized, S-shaped with curvatures of distal and proximal parts of approximately equal width. Cornu sclerotized distally with angulate sinuation ventrally. Proximal part of cornu unsclerotized. Nodulus comparatively long, ramus undifferentiated. Spermathecal duct more or less straight without definite coils. Stylomers and laterotergite IX as in Fig.28 View FIGURES 28 – 35 . Stylomer 2 more than 1.5 times longer than wide, with thick ensiferous seta. Laterotergite bearing 8–10 setae.

Distribution. Known only from the limestone area from the eastern part of Rich Mountain ridge, Blount County, Tennessee, within GSMNP.

Habitat. All beetles were collected under the same rock on a moderately steep slope several meters from high vertical rocks and around thirty meters from the entrance to an extensive cave system. The locality is situated in mesic mixed hardwood forest at relatively low altitude (500 m).

Differential diagnosis. Anillinus gimmeli is distinguished from all species of the loweae -group by the form of the median lobe and armature of the internal sac. Examination of the spermatheca is also helpful in differentiating the species. Externally, it is similar to A. juliae new species, described above, and differences are subtle, but genitalia of the two species are substantially different. In comparison to the loweae -group species the new species occupies another niche (rock interspaces) and it never has been found in the litter in spite of numerous efforts.

Anillinus gimmeli occurs sympatrically with two or three species of Anillinus ( A. cieglerae Sokolov & Carlton , A. loweae and A. steevesi ) and, presumably, one or two species of Serranillus . Externally, it can be distinguished from all species of Serranillus by the presence of long discal elytral setae. From A. cieglerae it can be distinguished by the presence of patches lacking microsculpture on the head. Anillinus gimmeli is practically indistinguishable from small specimens of A. loweae and A. steevesi . In some cases the more parallel-sided and less constricted base of the pronotum may assist with identification.