Piezonemus Jordan , 1904

Trýzna, Miloš, Caballero-Serrano, Verónica & Carrasco, Juan Carlos, 2024, Review of the Neotropical Piezonemus Jordan with type designations, description of Piezonemus espoch sp. nov. from Ecuador, and notes on the tribe Piesocorynini Valentine with keys to world genera (Coleoptera: Anthribidae), Zootaxa 5415 (3), pp. 401-435 : 408

Genus Piezonemus Jordan, 1904

( Figs 43–86 )

Piezonemus Jordan, 1904: 275 . Bovie 1906: 278 (catalogue); Wolfrum 1929: 65, 1953: 27 (catalogues); Blackwelder 1947: 769 (catalogue); Valentine 1999: 271 (relationship within the tribe Piesocorynini ); Rheinheimer 2004: 70 (catalogue); Trýzna et al. 2022: 245 (key to genera of the tribe Piesocorynini ), 265 (discussion on the tribe Piesocorynini ).

Type species: Piezonemus durus Jordan, 1904 (by original designation).

Redescription. Rostrum very short, distinctly wider than long (ratio of rostrum length to maximum width 0.3–0.4), flat, not carinate, indistinctly emarginate at apex, with only shallow depression before eyes. Apical half of rostrum oblique (converged) laterally. Mandibles more or less bent along the entire length, or along a substantial part, obtuse at apex. Antennal scrobes lateral, located underneath posterior part of eyes (not in front of them), upper edges cariniform. Eyes dorso-lateral, very large, occupying a considerable part of head, elongate, oblique, not emarginate or truncate in anterior part, coarsely granulate, distance between eyes as long as half of length of eye. Frons trapeziform, more or less flattened.

Pronotum always wider than long, conical, from dorsal transverse carina narrowed anteriorly, disc of pronotum moderately convex. Dorsal transverse carina sub-basal to basal, always complete. Lateral carinae of pronotum present, extending at most to middle of pronotum, or shorter. Basal longitudinal carinulae (sensu Jordan 1928: 151, Trýzna & Baňař 2021: 558) present. Pygidium of male distinctly longer than wide, convex, rounded at apex.

Pygidium of female differently shaped: in P. durus with distinct promontory before apical edge, this projection divided basally; in P. lateralis this promontory is not so high and not so deeply divided as in P. durus ; in P. espoch sp. nov. without any promontory, rather flat.

Mesotibia of male with small, short spine at apex in all species. Tarsomere I of mesotarsus widely dilated at apex on inner side in P. durus and P. lateralis ; tarsomere I of protarsus and mesotarsus with distinct spur at apex in male of P. espoch sp. nov.

Figures

FIGURES 43–48. Piezonemus durus Jordan, 1904, lectotype male (BMNH); 43, dorsal habitus; 44, head in dorsal view; 45, pronotum in dorsal view; 46, pygidium; 47, right antenna in dorsal view; 48, lateral habitus. Scale bars in mm.

FIGURES 49–55. Piezonemus durus, male (MTDC); 49, dorsal habitus; 50, head in dorsal view; 51, pronotum in dorsal view; 52, left antenna in dorsal view; 53, right mesotibia and mesotarsus; 54, pygidium; 55, lateral habitus. Scale bars in mm.

FIGURES 56–61. Piezonemus durus, male (MTDC), dissected terminalia; 56, pygidium; 57, segment VIII in ventral view; 58, sternite IX (= spiculum gastrale) in ventral view; 59, aedeagus in dorsal view; 60, internal sac of aedeagus in dorsal view; 61, tegmen in ventral view.

FIGURES 62–67. Piezonemus lateralis Jordan, 1904, lectotype male (BMNH); 62, dorsal habitus; 63, head in dorsal view; 64, left antenna in dorsal view; 65, pronotum in dorsal view; 66, pygidium, 67, lateral habitus. Scale bars in mm.

FIGURES 68–72. 68–69, Piezonemus lateralis, male (BMNH): 68, dorsal habitus; 69, left mesotarsus; 70–72, Piezonemus durus, paralectotype female (BMNH): 70, last abdominal ventrite (V) and pygidium in ventral view; 71, ditto in lateral view; 72, lateral habitus. Scale bars in mm.

FIGURES 73–80. Piezonemus espoch sp. n., holotype male (NMPC); 73, dorsal habitus; 74, head in dorsal view; 75, pygidium; 76, pronotum in dorsal view; 77, right antenna in dorsal view; 78, right protarsus; 79, right mesotarsus; 80, lateral habitus. Scale bars in mm.

FIGURES 81–86. Piezonemus espoch sp. n., allotype female (MTDC); 81,dorsal habitus; 82, head in dorsal view; 83, pygidium; 84, pronotum in dorsal view; 85, left antenna in dorsal view; 86, lateral habitus. Scale bars in mm.