Stigmatachys, Boyd, Olivia F. & Erwin, Terry L., 2016

Boyd, Olivia F. & Erwin, Terry L., 2016, Taxonomic review of New World Tachyina (Coleoptera, Carabidae): descriptions of new genera, subgenera, and species, with an updated key to the subtribe in the Americas, ZooKeys 626, pp. 87-123 : 107

Taxon classification Animalia Coleoptera Carabidae

Genus Stigmatachys gen. n.

Type species.

Stigmatachys uvea sp. n.

Diagnosis.

Mentum bifoveate; antennae submoniliform; eyes reduced; labial subulate palpomere absent or reduced; lateral margin of pronotum sinuate; elytral humerus rounded; elytral interneurs punctate and reduced in number, with punctures becoming irregular near apex; abdominal sclerites densely and irregularly punctate.

Description.

Size. ABL = 1.2 mm; SBL = 1.35 mm; TW = 0.6 mm.

Form. (Fig. 2A) Minute, compact, convex.

Color. Reddish brown, with lighter appendages.

Microsculpture. Mostly absent, with local patches of isodiametric microsculpture at base of head and around eyes.

Head. (Fig. 3A) Antennae submoniliform; mentum with shallow foveae; head with two pairs of supraorbital setae; eyes reduced, each with about 12 large facets; frontoclypeal suture with small lateral subfoveate depressions; frons without longitudinal depressions; margin above antennal insertion prominent, with longitudinal bead; small dark puncture between gular sutures; labial palps very small, with subulate palpomere reduced or absent.

Prothorax. (Fig. 3A) Pronotum markedly cordiform; posterior lateral margin slightly crenulate; basal section triangular and shallowly pitted/sculptured; basal transverse impressions and medial furrow sulcate, meeting at a point to form triangular basal section; prosternal process very narrow.

Pterothorax. Mesepisternum without pits or foveae; humeral angles obliquely rounded; elytra oval, convex, each elytron (Fig. 5A) with 9 ombilicate and 4 discal setae and 6 visible punctate interneurs, with punctures scattered near apex; lateral channel lined with evenly spaced punctures; i8 not visible (Fig. 4A); elytral margin serrate; elytral disc with a few short, fine setae between i4 and margin; ARG (Figs 4A, 5A) short and deeply engraved, slightly curved medially near apex, directed toward i3.

Abdomen. Ventrites densely punctate and moderately setose.

Genitalia. Not examined.

Distribution.

Known only from the type locality in Loreto, Perú.

Derivation of name:

Masculine. Derived from the Greek noun stigma (= “mark” or “puncture”), in reference to the coarsely punctate elytra of the lone representative of this genus, and Tachys , the nominate genus of the subtribe Tachyina .