Astaena explaniceps Saylor, 1947

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 : 101-103

Astaena explaniceps Saylor, 1947

Figs 2E–I , 7A

Astaena explaniceps Saylor, 1947b: 436 .

Astaena explaniceps – Frey 1973: 341 (identification key). — Evans 2003: 22 (checklist). — Evans & Smith 2005: 7 (checklist); 2007: 7 (checklist); 2009: 7 (checklist).

Type material examined

Holotype ARGENTINA • ♂; “Salta Prov. Arg. S.A. / L.W. Saylor Collection / California Academy of Sciences Type nº 7911 / Holotype Astaena explaniceps L.W. Saylor ”; CAS.

Holotype redescription

MEASUREMENTS. Length: 9.2 mm. Width: 3.8 mm.

HEAD. Reddish-brown, surface with upright setae. Labroclypeus, shape of anterior margin convex, posteriorly with dense punctation. Ocular canthus with terminal setae, ratio to eye: 1/2. 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 with setae. Pronotum unicolored, reddish-brown, widest at middle, anterior marginal line present, posterior marginal line absent, lateral margin strongly convex and smooth (not serrate), antero-lateral angle dorso-ventrally flattened, postero-lateral angle dorso-ventrally flattened, punctation on disc dense, setae of lateral margin sparse, median longitudinal excavation absent. Scutellum, punctures absent medially. Elytra unicolored, reddish-brown, surface opaque, microsculpture absent, punctation on intervals present and sparse, diameter of strial and interval punctation equal.

ABDOMEN. Lateral carina present. 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 absent. Metatibia, widest at apex, dorsal margin carinated, distal spines groups disposed at two thirds of metatibial length. First metatarsomere, ratio to dorsal metatibial spur: 1/3. Dorsal surface of tarsi glabrous, with punctures. Metatarsi, length of first protarsomere subequal to second and third combined, ventral margin serrated. Protibia with three teeth. Protarsi, length of first protarsomere subequal to second and third combined, second protarsomere narrow, claws symmetrical, inner protarsal claw bifid, apex of basal tooth of inner protarsal claw acute.

AEDEAGUS. Fig. 2E–F .

Figures

Fig. 2. A–D. Astaena excisipes Saylor, 1947, holotype, ♀ (Type No. 7910; CAS). – E–I. A. explaniceps Saylor, 1947, holotype, ♂ (Type No. 7911; CAS). – J–M. A. fusagona Saylor, 1946, holotype, ♀ (Type No. 7912; CAS). A, J. Head and pronotum, dorsal view. B, G, K. labels. C, H, L. Habitus, dorsal view. D, I, M. Habitus, lateral view. E. Parameres, dorsal view. F. Aedeagus, lateral view. Scale bars: A, E–F, J = 0.5 mm; C–D, 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..