Astaena yungasa 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 : 111-112

Astaena yungasa Saylor, 1946

Figs 5A–E , 7B

Astaena yungasa Saylor, 1946: 217 .

Astaena yungasa – Frey 1973: 333 (identification key). — Evans 2003: 31 (checklist). — Evans & Smith 2005: 15 (checklist); 2007: 15 (checklist); 2009: 15 (checklist).

Type material examined

Holotype BOLIVIA • ♂; “Yungas, Bolivia / L.W. Saylor Collection / California Academy of Sciences Type nº 7920 / Holotype Astaena yungasa L.W. Saylor ”; CAS.

Paratype BOLIVIA • 1 ♂; “Yungas, Bolivia / L.W. Saylor Collection / Paratype Astaena yungasa L.W. Saylor / CASENT 8438307 ”; CAS .

Holotype redescription

MEASUREMENTS. Length: 14 mm. Width: 6.75 mm.

HEAD. Blackish-brown, surface with upright setae. Labroclypeus, shape of anterior margin weakly sinuated medially, posteriorly with dense punctation. Ocular canthus with terminal setae, ratio to eye: 1/3. Eyes, ratio diameter/interocular width: 0.68. Antennae with eight antennomeres. Antennal club with three antennomeres. Ratio antennal club/remaining antennomeres: 1/1. Ratio third vs fourth antennomere: 1/4. Fourth antennomere, lateral projection absent. Ratio fifth vs fourth antennomere: 1/5.

PRONOTUM AND ELYTRA. Surface of pronotum and elytra with setae. Pronotum unicolored, blackishbrown, widest at middle, anterior marginal line present, posterior marginal line absent, lateral margin strongly convex and smooth (not serrate), antero-lateral angle dorso-ventrally not flattened, posterolateral angle dorso-ventrally not flattened, punctation on disc sparse, setae of lateral margin dense, 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. Ratio of length of metepisternum/metacoxa: 1/0.86. Metacoxa without longer lateral bristles, a laterally extended longitudinal shelf absent. Metatibia, widest at apex, ratio of width/length: 1/4.83, dorsal margin not carinated, ventral margin 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, with punctures. Metatarsi, length of first protarsomere subequal to second and third combined, ventral margin serrated and setose. 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. 5A–B .

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..