Achaetomalachius Majer, 1989

Miao, Jialin, Liu, Haoyu, Tong, Junbo, Yang, Xingke & Yang, Yuxia, 2025, A new species of Achaetomalachius Majer, 1989 (Coleoptera, Dasytidae) from Xizang, China, Zootaxa 5665 (1), pp. 111-120 : 112

Genus Achaetomalachius Majer, 1989

Achaetomalachius Majer, 1989: 751 . Type species: Chaetomalachius tibialis Khnzorian, 1966 , by original designation.

Diagnosis. Body small-sized, 2.1–4.2 mm in length. Body covered with more or less prominent dual pubescence, either long, stout and erect, or short, fine and adpressed. Pronotum rounded or nearly rectangular, without sublateral lines, lateral margins arcuate with more or less conspicuous sparse crenation ( Fig. 2 ). Tarsi simple, tarsomeres 4 obviously smaller than 3. Ultimate abdominal ventrite with median process absent in male ( Fig. 3A ), present in female ( Fig. 4A ). Spiculum gastrale Y-shaped ( Fig. 3H ). Tegmen in ventral view subparallel-sided or slightly dilated at basal part, with submedian dilation distinctly angled, mostly truncate at apex, usually with a pyriform subapical ring, apex covered with a few setae ( Fig. 3C ); tegmen in lateral view more or less bent ventrally at base ( Fig. 3E ), the bent part with a median line on inner surface ( Fig. 3D ) and almost devoid of a median keel on outer surface. Apical limb of median lobe in lateral view mostly slender, nearly straight ventrally at apical two-thirds, with apex directing apically or slightly incurved ventrally ( Fig. 3G ). Internal sac with numerous distinct spines ( Fig. 3F, G ). Ovipositor ( Fig. 4C ) stout and membranous, gonostylus long and nearly cylindrical, transverse coxital baculum short and arcuate, baculum long and oblique, each with a short branch near apical 1/3.

Distribution ( Fig. 1 ). China (Xizang), Afghanistan, India, Iran, Myanmar, Nepal, Pakistan.

Figures

FIGURE 1. Distribution map of all Achaetomalachius species.

FIGURE 2. Habitus of Achaetomalachius nyingchiensis Yang & Miao sp. nov., dorsal view: A male; B female. Scale bars: 1.0 mm.

FIGURE 3. Achaetomalachius nyingchiensis Yang & Miao sp. nov., holotype, male: A ultimate abdominal ventrite, ventral view; B pygidium, dorsal view; C tegmen, ventral view; D tegmen, top view; E tegmen, lateral view; F median lobe, ventral view; G median lobe, lateral view; H spiculum gastrale, ventral view. Scale bars: 0.2 mm.

FIGURE 4. Achaetomalachius nyingchiensis Yang & Miao sp. nov., paratype, female: A ultimate abdominal ventrite, ventral view; B pygidium, dorsal view; C ovipositor, ventral view. Scale bars: 0.2 mm.