Zapotecanillus oaxacanus, 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 : 57-59

Zapotecanillus oaxacanus sp. n. Figs 1, 3, 5, 7, 9-13, 15-18, 22, 24, 32, 36-38, 60, 68, 72, 77, 90-92, 94

Type material.

HOLOTYPE, male, in NMNH, point-mounted, labeled: \MEXICO. Oaxaca 18.7mi S Valle Nacional 5200' 17 Aug.1973\ A.Newton Collector \ Loan from NMNH 2051867\. PARATYPES (8 ex., 4♂2♀ were dissected), labeled same as a holotype, except two specimens, which have an additional label: \ Geocharidius n. sp. det. T.L.Erwin 76\ each, where italicized font means handwritten (deposited in CAS, NMNH).

Specific epithet.

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

Type locality.

Mexico, Oaxaca, 18.7mi S from Valle Nacional.

Recognition.

Adults of this new species can be distinguished easily from those of other species of the genus by the following combination of external characters: bicolored and robust appearance, comparatively small head and distinctly transverse pronotum.

Description.

Size. Medium-sized for the genus (SBL range 1.30-1.36 mm, mean 1.33 ± 0.049 mm, n=8).

Habitus. Body form (Fig. 24) moderately convex, slightly elongate (WE/SBL 0.41 ± 0.09), head narrow for genus compared to pronotum (WH/WPm 0.69 ± 0.015), pronotum wide compared to elytra (WPm/WE 0.81 ± 0.017).

Color. Body bicolored: head and pronotum brunneorufous, elytra rufotestaceous, appendages testaceous.

Microsculpture. Disc of pronotum with well-developed microsculpture.

Prothorax. Pronotum (Fig. 32) relatively long (LP/LE 0.44 ± 0.006) and markedly transverse (WPm/LP 1.33 ± 0.022), with lateral margins straight and moderately constricted posteriorly (WPm/WPp 1.32 ± 0.034). Basal margin straight. Contour of posterior angles nearly rectangular (100-110°) with 1-2 small denticles in front of the angles.

Elytra (Fig. 3). Convex, not depressed along suture, comparatively wide (WE/LE 0.73 ± 0.013). Margins rounded, slightly divergent in basal half, evenly rounded to apex in apical half, maximal width of elytra at midpoint.

Legs. 1st male protarsomere only slightly dilated (Fig. 22).

Male genitalia. Median lobe of aedeagus (Fig. 36), with short and transverse apex, broadly rounded at tip. Dorsal plate 1 long, with apical pointed attenuation of moderate length. Dorsal plate 2 joined to plate 1 at its middle ventrally, where it forms a distinct protuberance. Ventral sclerites elongate, with subparallel sides and obliquely stretched from dorsal plates towards ventral margin of median lobe. Right paramere short and moderately wide (Fig. 38). Left paramere with distinct apical constriction (Fig. 37). Ring sclerite with long handle-like extension, widely rounded apically (Fig. 60).

Female genitalia. Gonocoxite 2 rather long, with slightly curved blade and rounded apex (Fig. 68). Laterotergite with 7-8 setae. Spermatheca standard for genus (Fig. 72).

Geographical distribution. This species is known only from the type locality in the Sierra de Juárez Range, a part of the Sierra Madre de Oaxaca, within the high course of the Rio de Valle Nacional (Figs 77 and 94, black quadrangles).

Way of life. Specimens of this species were collected at an altitude of 5200 feet (1600 m).

Relationships. The armature of internal sac of Zapotecanillus oaxacanus males is nearly indistinguishable from that of Zapotecanillus nanus and Zapotecanillus ixtlanus males, described below, clearly suggesting both of them as closest relatives. The former species is sympatric with Zapotecanillus oaxacanus and, based on the same label data, may also be syntopic (i.e., their members may occur together in the same habitat). See also Fig. 90 for cladistic affinities.