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Type: Article
Published: 2023-01-24
Page range: 467-477
Abstract views: 331
PDF downloaded: 43

Euryachen seuzei, a new genus and species of Placusini (Coleoptera: Staphylinidae: Aleocharinae) from Brazil

1Programa de pós graduação em Sistemática, Taxonomia animal e Biodiversidade, Museu de Zoologia da Universidade de São Paulo, Laboratório de Coleoptera, São Paulo, Brazil
Coleoptera Euvira fungivory Homalotini Neotropical Placusa rove beetles


The tribe Placusini (Coleoptera: Staphylinidae) consists five genera with worldwide distribution. Despite great morphological diversity, the species are easily recognized by their 4-4-5 tarsal formula and the two-articulated labial palpi, along with a broad and rounded ligula. Several synapomorphies proposed by earlier authors, both for larvae and adults, have led to the conclusion that the tribe now is considered monophyletic within Aleocharinae. Herein, a new genus and species of Placusini from Brazil is described and illustrated. Euryachen seuzei gen. et sp. nov. presents all the proposed synapomorphies for the tribe, in addition to unique characters. An updated key for the genera in Placusini is also provided.



  1. Asenjo, A., Irmler, U., Klimaszewski, J., Herman, L.H. & Chandler, D.S. (2013). A complete checklist with new records and geographical distribution of the rove beetles (Coleoptera, Staphylinidae) of Brazil. Insecta Mundi, 2013, 1–419.
    Asenjo, A., Klimaszewski, J., Chandler, D.S., Fierros-López, H.E. & Vieira, J.S. (2019) Staphylinidae (Insecta: Coleoptera) in Latin America: synopsis, annotated catalog, diversity and distribution. Zootaxa, 4621 (1), 1–406.
    Ashe, J.S. (1984) Generic revision of the subtribe Gyrophaenina (Coleoptera: Staphylinidae: Aleocharinae) with a review of the described subgenera and major features of evolution. Quaestiones entomologicae, 20, 129–349.
    Ashe, J.S. (1990) The larvae of Placusa Mannerheim (Coleoptera: Staphylinidae), with notes on their feeding habits. Insect Systematics & Evolution, 21, 477–485.
    Ashe, J.S. (1991) The systematic position of Placusa Erichson and Euvira Sharp: the tribe Placusini described (Coleoptera: Staphylinidae: Aleocharinae). Systematic Entomology, 16, 383–400.
    Ashe, J.S. & Kistner, D.H. (1989) Larvae and adults of a new species of Euvira (Coleoptera: Staphylinidae: Aleocharinae) from the nests of the communal pierid butterfly Eucheira socialis with a redescription of the genus Euvira. Sociobiology, 15, 85–106.
    Eldredge, K.T. (2022) A new myrmecophilous genus of Falagriini from Colorado, USA (Coleoptera: Staphylinidae: Aleocharinae). Zootaxa, 5165 (4), 575–590.
    Gusarov, V.I. (2003) Revision of some types of North American aleocharines (Coleoptera: Staphylinidae: Aleocharinae), with synonymic notes. Zootaxa, 353, 1–134.
    Klimaszewski, J. & Majka, C.G. (2007) Euvira micmac, a new species (Coleoptera: Staphylinidae: Aleocharinae), and first record of the genus in Canada. The Canadian Entomologist, 139, 147–153.
    Klimaszewski, J., Pelletier, G., Germain, C., Hébert, C., Humble, L.M. & Winchester, N.N. (2001) Diversity of Placusa (Coleoptera: Staphylinidae, Aleocharinae) in Canada, with descriptions of two new species. The Canadian Entomologist, 133, 1–47.
    Pace, R. (2008) New records of Aleocharinae from Ecuador and Peru, with the description of new species, new subgenera and new genera (Coleoptera, Staphylinidae). Biodiversity of South America, I. Memoirs on Biodiversity, 1, 225–398.
    Pace, R. (2013) New distributional data, new species and three new genera of Aleocharinae from Malaysia, Vietnam and Taiwan (Coleoptera: Staphylinidae). Tropical Zoology, 26, 33–63.
    Santiago-Jiménez, Q.J. & Santiago-Navarro, R. (2016) A new genus and species of Placusini from a high mountain in Mexico. ZooKeys, 640, 45–57.
    Sawada, K. (1970) Aleocharinae (Staphylinidae, Coleoptera) of the IBP-Station in the Shiga Heights, Central Japan (I). Bulletin of the National Science Museum, 13 (1), 21–64.
    Seevers, C.H. (1978) A generic and tribal revision of North American Aleocharinae (Staphylinidae). Fieldiana Zoology, 71, 1-279.