Astaena pygidia Saylor, 1946

Pacheco, Thaynara L., Monné, Marcela L., Vaz-De, Fernando Z. & Ahrens, Dirk, 2021, Revision of type specimens of Astaena (Coleoptera: Scarabaeidae: Melolonthinae: Sericini) described by L. W. Saylor, European Journal of Taxonomy 750 (750), pp. 94-123 : 108

Astaena pygidia Saylor, 1946

Figs 4A–E , 7B

Astaena pygidia Saylor, 1946: 230 .

Astaena pygidia – Frey 1973: 339 (identification key). — Evans 2003: 28 (checklist). — Evans & Smith 2005: 12 (checklist); 2007: 12 (checklist); 2009: 12 (checklist).

Type material examined

Holotype PERU • ♂; “Peru / Vitoc, 1400 to 1800m ix-22-40 / Coll of Bob Potts / L.W. Saylor Collection / California Academy of Sciences Type nº 7917 / Holotype Astaena pygidia L.W. Saylor ”; CAS.

Holotype redescription

MEASUREMENTS. Length: 8 mm. Width: 4 mm.

HEAD. Reddish-brown. Labroclypeus, shape of anterior margin weakly sinuated medially, posteriorly with sparse punctation. Ocular canthus with terminal setae, ratio to eye: 1/3. Antennae with eight antennomeres; antennal club with three antennomeres; ratio antennal club/remaining antennomeres: 1/1; ratio third vs fourth antennomere: 1/3; fourth antennomere, lateral projection absent; ratio fifth vs fourth antennomere: 1/5.

PRONOTUM AND ELYTRA. Surface of pronotum and elytra without setae. Pronotum unicolored, brownishorange, widest at middle, posterior marginal line absent, lateral margin strongly convex and smooth (not serrate), postero-lateral angle dorso-ventrally not flattened, punctation on disc sparse, setae of lateral margin sparse, median longitudinal excavation absent. Scutellum, punctures absent medially. Elytra unicolored, brownish-orange, surface opaque, microsculpture absent, punctation on intervals present and sparse, diameter of strial and interval punctation equal.

ABDOMEN. Lateral carina absent. Second visible ventrite without row of setae in medial region. Apical visible ventrite without suture to apical tergite.

LEGS. Metacoxa without longer lateral bristles, a laterally extended longitudinal shelf present. Metatibia, widest at apex, ventral margin serrated, distal spines groups disposed at two thirds of metatibial length. First metatarsomere, ratio to dorsal metatibial spur: 1/3. Dorsal surface of tarsi glabrous, without punctures. Metatarsi, length of first protarsomere subequal to second and third combined, ventral margin setose. Protibia with three teeth. Protarsi, second protarsomere narrow, claws asymmetrical, inner protarsal claw bifid, apex of basal tooth of inner protarsal claw truncate.

AEDEAGUS. Fig. 4A–B .

Figures

Fig. 4. A–E. Astaena pygidia Saylor, 1946, holotype, ♂ (Type No. 7917; CAS). – F–I. A. rugithorax Saylor, 1946, holotype, ♀ (Type No. 7918; CAS). – J–M. A. salta Saylor, 1946, holotype, ♀ (Type No. 7919; CAS).A. Aedeagus, lateral view. B. Parameres, dorsal view.C, G, K. Labels.D, H, L. Habitus, dorsal view. E, I, M. Habitus, lateral view. F, J. Head and pronotum, dorsal view. Scale bars: A–B, F, J = 0.5 mm; D–E, H–I, L–M = 1 mm.

Fig. 7. Distribution of type localities of the South American Sericini species described by Saylor. A. Astaena abaca Saylor, 1946, A. biciliata Saylor, 1946, A. bogotana Saylor, 1946, A. excisipes Saylor, 1947, A. explaniceps Saylor, 1947, A. incachaca Saylor, 1946, A. maqueta Saylor, 1947, and A. nigrona Saylor, 1947. B. A. fusagona Saylor, 1946, A. pygidia Saylor, 1946, A. rugithorax Saylor, 1946, A. salta Saylor, 1946, A. yungasa Saylor, 1946, and A. zyrota Saylor, 1946. C. Sayloria abcora (Saylor, 1946) comb. nov., S. bicoloripes (Saylor, 1946) comb. nov., and S. pottsi (Saylor, 1946) comb. nov..