Astaena zyrota 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 : 112-114

Astaena zyrota Saylor, 1946

Figs 5F–J , 7B

Astaena zyrota Saylor, 1946: 232 .

Astaena zyrota – Frey 1973: 352 (identification key). — Evans 2003: 31 (checklist). — Evans & Smith 2005: 15 (checklist); 2007: 16 (checklist); 2009: 16 (checklist).

Type material examined

Holotype GUIANA • ♂; “Tumatumari VI Br Guiana / L.W. Saylor Collection / California Academy of Sciences Type nº 7921 / Holotype Astaena zyrota L.W. Saylor ”; CAS.

Holotype redescription

MEASUREMENTS. Length: 7.5 mm. Width: 4.5 mm.

HEAD. Reddish-brown, surface without setae. Labroclypeus, shape of anterior margin weakly sinuated medially, posteriorly with sparse punctation. Ocular canthus without terminal setae, ratio to eye: 1/4. Antennae with eight antennomeres; antennal club with three antennomeres; ratio antennal club/remaining antennomeres: 1/1.5; ratio third vs fourth antennomere: 1/3; fourth antennomere, lateral projection absent; ratio fifth vs fourth antennomere: 1/5.

PRONOTUM AND ELYTRA. Pronotum unicolored, reddish-brown, widest at middle, anterior marginal line present, posterior marginal line absent, lateral margin weakly convex and not serrated, antero-lateral angle dorso-ventrally not flattened, postero-lateral angle dorso-ventrally not 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, punctation on intervals dense, diameter of strial and interval punctation equal.

ABDOMEN. Lateral carina present. Second visible ventrite with 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, ventral margin not serrated, distal spines groups disposed at two thirds of metatibial length. First metatarsomere, ratio to dorsal metatibial spur: 1/2. Dorsal surface of tarsi glabrous, without punctures. Metatarsi, length of first protarsomere smaller than second and third combined, ventral margin glabrous. Protibia with three teeth. Protarsi, length of first protarsomere subequal to second and third combined, second protarsomere narrow, claws asymmetrical, inner protarsal claw bifid, apex of basal tooth of inner protarsal claw truncate.

AEDEAGUS. Fig. 5F–G .

Figures

Fig. 5. A–E. Astaena yungasa Saylor, 1946, holotype, ♂ (Type No. 7920; CAS). – F–J. A. zyrota Saylor, 1946, holotype, ♂ (Type No. 7921; CAS). – K–L. Sayloria bicoloripes (Saylor, 1946), paratype, ♂ (CAS). – M–O. S. bicoloripes, holotype, ♀ (Type No. 7908; CAS). A, F, L. Aedeagus, lateral view. B, G, K. Parameres, dorsal view. C, H, M. Labels. D, I, N. Habitus, dorsal view. E, J, O. Habitus, lateral view. Scale bars: A–B, F–G, K–L = 0.5 mm; D–E, I–J, N–O = 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..