Zapotecanillus ixtlanus, Sokolov, Igor M., 2013

Sokolov, Igor M., 2013, A new genus and eight new species of the subtribe Anillina (Carabidae, Trechinae, Bembidiini) from Mexico, with a cladistic analysis and some notes on the evolution of the genus, ZooKeys 352, pp. 51-92 : 61-63

Zapotecanillus ixtlanus sp. n. Figs 26, 42-44, 62, 77, 90, 92, 94

Type material.

HOLOTYPE, male, in CMNH, point-mounted, labeled: \MEXICO: Oaxaca, 32 miles S Valle Nacional, 7000 ft. 23 May 1971, ex. leaf litter, Peck\ THOMAS C. BARR COLLECTION 2011 Acc. No. 38014\. PARATYPES (17 ex., 3♂1♀ were dissected), 10 ex. labeled same as a holotype; one male labeled: 8500', 37mi. S. Valle Nacional, Oax. Mex. V.24.1971 H.Howden \ Borrowed Ex. H.F. Howden \ Loan from USNMNH 2051867\; 3 ex. labeled: \MEXICO: Oaxaca, 37 mi. S Valle Nacional, 8500 ft. 23 May 1971, ex. leaf litter, Peck\ THOMAS C. BARR COLLECTION 2011 Acc. No. 38014\; 3 ex. labeled: \MEXICO: Oaxaca, 37 mi. S Valle Nacional, oak litter, 25 May 1971, S. Peck\ THOMAS C. BARR COLLECTION 2011 Acc. No. 38014\ (deposited in CAS, CMNH, NMNH).

Specific epithet.

The specific epithet is a Latinized adjective in the masculine form based on Ixtlan, the district of the state of Oaxaca, Mexico from which the new species is described.

Type locality.

Mexico, Oaxaca, 32mi. S. Valle Nacional.

Recognition.

Males of this new species can be distinguished from those of other species of the genus by the combination of the large size and shape of the median lobe (Fig. 42).

Description.

Size. Large for genus (SBL range 1.32-1.53 mm, mean 1.39 ± 0.069 mm, n=12).

Habitus. Body form (Fig. 26) moderately convex, slightly elongate (WE/SBL 0.41 ± 0.016), head of normal proportions for genus (WH/WPm 0.72 ± 0.013), pronotum narrow compared to elytra (WPm/WE 0.72 ± 0.038).

Color. Body monocolorous, rufobrunneous, appendages testaceous.

Microsculpture. Disc of pronotum with well-developed microsculpture.

Prothorax. Pronotum relatively small (LP/LE 0.39 ± 0.020) and moderately transverse (WPm/LP 1.31 ± 0.039), with margins straight and distinctly constricted posteriorly (WPm/WPp 1.41 ± 0.050). Basal margin oblique laterally. Contour of posterior angles obtuse (111-123°) with a small denticle.

Elytra. Convex, not depressed along suture, of moderate width (WE/LE 0.70 ± 0.023). Margins subparallel at middle, slightly divergent in basal third, evenly rounded to apex in apical third, maximal width of elytra slightly behind midpoint.

Legs. 1st male protarsomere markedly dilated apico-laterally.

Male genitalia. Median lobe of aedeagus (Fig. 42) with short semicircular apex. Dorsal plate 1 long, with short apical attenuation. Dorsal plate 2 joined to plate 1 at its middle ventrally, where it forms a distinct protuberance. Ventral sclerites slightly sclerotized, trianguloid in shape. Right paramere short and moderately wide (Fig. 44). Left paramere without apical constriction (Fig. 43). Ring sclerite with short handle-like extension, pointed apically (Fig. 62).

Female genitalia. Spermatheca standard for genus.

Geographical distribution.

The species is known only from the type locality in the Sierra Juárez Range, a part of the Sierra Madre de Oaxaca (Figs 77 and 94, white circle).

Way of life.

Specimens were collected at altitudes 7000-8500' (2100-2600 m) in oak litter.

Relationships.

Aedeagal characters (shape of the median lobe and dorsal plates) suggest that Zapotecanillus ixtlanus is closely related to Zapotecanillus oaxacanus and Zapotecanillus nanus . See also Fig. 90 for cladistic affinities.