Manonychus robustus ( Burmeister, 1855 ) Pacheco & Monné & Vaz-De-Mello & Ahrens, 2020

Pacheco, Thaynara L., Monné, Marcela L., Vaz-De-Mello, Fernando Z. & Ahrens, Dirk, 2020, Notes on the taxonomy of some “ Astaena ” species described by Burmeister (Coleoptera: Scarabaeidae: Melolonthinae), Zootaxa 4885 (1), pp. 143-145 : 144

Manonychus robustus ( Burmeister, 1855) , new combination

Astaena robusta Burmeister, 1855: 127 .

Type material examined. Lectotype of Astaena robusta , ♀, here designated: “ robusta Br. Bras. Pryd. / ♀ / A. robusta Burm. / Zool. Inst. Halle / Type Astaena robusta G. Frey 19 Bur. / Martin-Luther-Universität Halle-Wittenberg Zentralmagazin Naturw. Sammlungen 18/01 05.12.2019 / Lectotype ♀ Astaena robusta Burmeister, 1855 det. T. Pacheco” ( MLUH) . Paralectotype of Astaena robusta , 1 ♀: “Zool. Inst. Halle / Type Astaena robusta G. Frey 19 Bur. / MartinLuther-Universität Halle-Wittenberg Zentralmagazin Naturw. Sammlungen 18/01 05.12.2019 / Paralectotype ♀ Astaena robusta Burmeister, 1855 det. T. Pacheco” ( MLUH) .

Remarks. The exact identity of this species remains so far uncertain since both syntypes are female specimens. Given the labrum beneath clypeus, and metatibial spines disposal below and above the tarsal articulation, the species must be placed into Sericoidini ( Smith 2008). The genus assignment of this species to Manonychus Moser, 1919 is based on the galea with outer margin lobed, elytra almost smooth, protarsomeres and mesotarsomeres with pads, and metacoxae length equal to ventrite II (see Costa et al. 2020). So far, eight species are known for Manonychus ( Evans & Smith 2009; Cherman et al. 2016). Recently a new genus has been erected from one of those species (plus two other new discovered taxa), Ovomanonychus Costa, Cherman & Iannuzzi, 2020 , which have clearly striped elytra ( Costa et al. 2020). A revision of the genus Manonychus is currently in progress by other authors (see Costa et al. 2020).