Crenulister paucitans, Caterino, Michael S. & Tishechkin, Alexey K., 2014

Caterino, Michael S. & Tishechkin, Alexey K., 2014, New genera and species of Neotropical Exosternini (Coleoptera, Histeridae), ZooKeys 381, pp. 11-78 : 52-54

Crenulister paucitans sp. n. Fig. 22, Map 4

Type locality.

BRAZIL: Pará: Tucuruí [3.75°S, 49.67°W].

Type material.

Holotype female: “BRASIL:Pará: Tucuruí, 3°45'S, 49°40'W. Piège d’interception. 27.x-9.xi. 1985" / "Caterino/Tishechkin Exosternini Voucher EXO-00180" (UFPR).

Diagnostic description.

Length: 3.1 mm, width: 2.6 mm; as for generic description with the following diagnostic characters: body rufobrunneus, elongate ovoid, moderately convex; frontal stria fine, very narrowly interrupted at middle, frontal disk moderately depressed, with very sparse secondary punctures barely larger than background punctation; epistoma with weak lateral ridges delimiting median depression; labrum about 4 × wider than long, apical margin more or less straight across; pronotum with gland opening track extending posterad to about midpoint, with 3 openings lying within weak striole in its posterior half; pronotal sides explanate along crenulate lateral submarginal stria; pronotal disk with secondary punctures restricted to basal margin, the smallest barely extending beyond the basal fourth, sides largely smooth; prescutellar impression not evident; elytron with one complete, crenulate epipleural stria and posterior fragments of second incomplete stria closer to margin, all dorsal striae complete, moderately coarsely impressed, appearing chain-like; elytral intervals very sparsely, irregularly punctate, most intervals with 8-12 small punctures; prosternal keel with complete carinal striae slightly separated anteriorly; prosternal lobe slightly deflexed, with marginal stria present only at middle; mesoventrite with marginal stria smooth, mesometaventral stria crenulate, subangulately arched forward just to about mesoventral midpoint; postmesocoxal stria slightly recurved anterad around mesocoxa, but ending short of mesepimeron; lateral metaventral stria weakly crenulate, reaching middle of metacoxa; metaventrite with secondary punctures larger and denser in posterior half; metepisternal punctures not coalesced into a short stria; lateral stria of 1st abdominal ventrite well impressed along inner edge of metacoxa, with a separate transverse striole behind metacoxa; punctures of 1st abdominal ventrite rather small, finer and sparser posterad, slightly obliquely elongate posterad metacoxa, transversely elongate along posterior margin, intermittently coalesced into marginal strioles, as are those of ventrites 2-4; protibia 7-8-spined, with marginal dentation weakly developed; mesotibia with 6 spines along margin, metatibia with 4 spines, mainly in apical half; propygidium with secondary punctures shallow, sparse, separated by 1-3 × their diameters throughout; propygidial disk lacking anterolateral strioles; pygidial punctation very sparse and fine, almost obsolete along midline; pygidial gland openings slightly tuberculate, evident near sides about one-fifth from base; pygidial margin lacking striae. Male: not known.

Remarks.

Given the existence of only a single specimen, it seems likely that many apparently distinct features may become less so in light of individual variation. How ever, this species can generally be distinguished by the strong limitation of pronotal punctures to the basal fourth (Fig. 22A), the association of the pronotal gland openings with a distinct longitudinal striole, the diminished punctation in the anterior half of the metaventral disk, and the lack of marginal pygidial stria (Fig. 22B).

Etymology.

The name of this species refers to the relative paucity of punctures in the elytral interstriae.