Picolistrus Majer, 1990

Miao, Jialin, Liu, Haoyu, Tong, Junbo, Yang, Xingke & Yang, Yuxia, 2025, A remarkable new species of Picolistrus Majer, 1990 (Coleoptera, Dasytidae) from Yunnan, China, Biodiversity Data Journal 13, pp. e 156603-e 156603 : e156603-

Picolistrus Majer, 1990

Picolistrus Majer, 1990 - Majer 1990: 377.

Dasytiscus inhirsutus Pic, 1922

Diagnosis

Body small-sized and stout, 1.3–3.0 mm in length. Upper body surface densely covered with very fine, short and recumbent pubescence. Lateral margins of pronotum and elytra fringed with erect hairs obliquely directed backwards (Fig. 1 ). Antennomeres 6–9 at most as wide as long, mostly transverse. All tibiae with fixed spines along the length of the outer face in both sexes and males with enlarged fixed spurs at the apical inner base of one or all tibiae (pro-, meso- and / or metatibiae); tarsi shorter than tibiae, tarsomeres 1–4 wider than long; tarsal claws symmetrical, with a pair of completely membranous appendages, which are about as long as claws. Abdominal sternite VIII completely separated, with median process often expressively reduced or absent in males (Fig. 2 A). Apex of tegmen without any setae, not or slightly protruding apically (Fig. 2 C); apical limb of median lobe elongate triangular at distal half and sharp at apex in ventral view (Fig. 2 E), basal limb strongly bent ventrally, at an angle of at least 90 ˚ with the apical limb, apical limb prominently angled near middle, tapered apically and apex slightly incurved ventrally in lateral view (Fig. 2 F). Spiculum gastrale (Fig. 2 G) Y-shaped. Ovipositor (Fig. 3 C) stout and membranous, gonostylus long and nearly cylindrical, transverse coxital baculus short and bisinuate, baculus long and oblique.

Distribution

China (Yunnan), Myanmar (Tenasserim) (Fig. 4 ).

Figures

Figure 1. Habitus of Picolistrus flavoapicalis Y. Yang & Miao, sp. nov., dorsal view: A male; B female. Scale bars: 1.0 mm.

Figure 2. Picolistrus flavoapicalis Y. Yang & Miao, sp. nov., holotype, male: A abdominal sternite VIII, ventral view; B pygidium, dorsal view; C tegmen, ventral view; D tegmen, lateral view; E median lobe, ventral view; F median lobe, lateral view; G spiculum gastrale, ventral view. Scale bars: 0.2 mm.

Figure 3. Picolistrus flavoapicalis Y. Yang & Miao, sp. nov., paratype, female: A abdominal sternite VIII, ventral view; B pygidium, dorsal view; C ovipositor, ventral view. Scale bars: 0.2 mm.

Figure 4. Distribution map of all Picolistrus species.