Comparative morphology of the genera with perpendicular parameres in Anomalini (Coleoptera, Scarabaeidae, Rutelinae) allows revalidation of the endemic Mexican genus Lamoana Casey, 1915 stat. rev. Madrigal, Kevin Zaragoza-Caballero, Santiago Ramírez-Ponce, Andrés European Journal of Taxonomy 2023 2023-12-13 910 175 199 (Blanchard, 1851) Blanchard 1851 [461,958,1537,1564] Insecta Scarabaeidae Strigoderma Animalia Coleoptera 1 176 Arthropoda species villosella  Historical taxonomic records are fundamental and pivotal tools to any taxonomic work, as they form a link between past ideas and modern changes ( Gravina et al.2020). For that reason, it is important to take a brief look at the historic background of  S. villosellaso we can understand its present condition and justify our decisions.  Blanchard (1851)originally described  S. villosellain the genus  Phyllopertha.The information given by this author is somewhat simple and lacks certain important information such as the precise typelocality and male genitalia. Bates (1888)made the first change to the genus  Anomala, arguing that the legs were more robust than those of other species of  Phyllopertha. In that study, Bates also described  Strigoderma presidiibut saw that its mesepimera did not rise near the elytral humeri, so he proposed that it might belong to  Anomala. Nonfried (1893)made the revision of the genera  Epectinaspisand  Strigoderma, and described  S. hirsuta. Casey (1915)established  Lamoana, a monospecific genus created for  A. villosella.Casey’s observations were quite complete, considering the standards of that time, but he did not make a morphological comparison of the male genitalia. It must be said that the specimens that Casey evaluated came from a different locality than those that Bates and Blanchard studied, so it is uncertain whether they belonged to the same species or not. Ohaus (1918)synonymized  S. hirsutawith  A. villosellaand retained it in  Anomala. This nomenclatural change was made without considering all the morphological criteria that Casey established for this taxon three years earlier. We must say that there is no explanation why Ohaus ignored Casey’s decision. In 1944, Blackwelder published a checklist of beetles of Mexico, Central America, South America, and the West Indies. In this study, he retained the synonymy between  A. villosella– S. hirsutaand recognized  Lamoanaas a subgenus. Almost 50 years later, Bader (1992)redescribed  S. presidiiand made several notes about its position. He remarked on the similarity of  A. villosellawith  S. teapensis Bates, 1888and  S. presidiiin both general habitus and the shape of the male genitalia and noted that the latter presented an intermediate morphological condition between  Strigodermaand  Anomala, arguing that it must be placed in a new genus or be changed to  Anomala. Ramírez-Ponce & Morón (2009)made a phylogenetic study to evaluate the relationships between the genera of Anomalini. They concluded that the principal difficulty in delimiting genera with precision within the tribe was that some of genera had been established on questionable criteria. They revalidated  Pachystethus; demonstrated the paraphyly of  Callistethus; validated the synonymy between  Anomalacra Casey, 1915and  Paranomala; revalidated  Paranomala, and thus  A. villosellawas transferred to  Paranomala.Some years later, Ramírez-Ponce (2012), studied the supraspecific systematics of  Paranomala, and found that  P. villosellawas near to the Strigoderma-Epectinaspisclade, so he decided to place it in  Strigoderma. Notwithstanding his decision, he remarked on the similarity in terms of male genitalia to some species of  Epectinaspisand  Balanogonia, just as Paucar-Cabrera had in 2003. In recent studies, the internal and external morphology have been carefully compared among the genera of Anomalini, which has allowed us to recognize patterns of variation and homologies at different levels, thus proposing taxonomic arrangements within the tribe, finding that the parameres in a perpendicular position with respect to the tectum presented in  Strigoderma villosella, is shared with the genera  Balanogonia,  Callirhinus,  Dilophochila,  Moroniellaand  Mazahuapertha( Morón & Ramírez-Ponce 2012; Ramírez-Ponce 2012, 2015). An overall comparative study of male genitalia within these genera has led us to recognize clear differences in  Strigoderma villosellathus reinforcing the evidence for revalidating the genus  Lamoana.