Tomeurus Eigenmann, 1909

Lucinda, Paulo Henrique Franco & Reis, Roberto E., 2005, Systematics of the subfamily Poeciliinae Bonaparte (Cyprinodontiformes: Poeciliidae), with an emphasis on the tribe Cnesterodontini Hubbs, Neotropical Ichthyology 3 (1), pp. 1-60 : 37

Genus Tomeurus Eigenmann

Tomeurus Eigenmann, 1909: 53 . Genus masculine. Type-species: Tomeurus gracilis Eigenmann, 1909 . Type by monotypy and original designation.

Composition. Tomeurus gracilis Eigenmann.

Distribution. Tomeurus gracilis occurs in small coastal drainages of the Venezuelan departments Delta Amacuro, Monagas, Territorio Federal, and in Brazilian states of Amapá, and Pará. The species also inhabits the drainages of rio Guamá and rio Tocantins in Brazil, the drainages of the Cuyuni, Mazaruni, and Essequibo Rivers in the Guyana and Courantyne rivier drainage in Suriname.

TribeAlfarini + Tribe Brachyrhaphini + Tribe Priapichthyini + Tribe Priapellini + Tribe Heterandriini + Tribe Gambusiini + Supertribe Poeciliini [Clade 126]

Diagnosis. Members of this clade can be diagnosed by the following not uniquely derived and/or reversed features: (1) posterior supraorbital canal (2b, 3, 4a) opened, forming a sinuous depression over the frontal (supraorbital bone) [5-1*]; (2) anterior section of posterior remnant of infraorbital system (canal 4b, 5, 6a) opened, pores confluent forming a major sinuous depression above and slightly behind the orbit [6- 1]; (3) medial surface of ascending process of premaxilla slightly angled laterally [11-1*]; (4) anterior border of ventral maxilla concave [14-1]; (5) pelvic girdle of males posteriorly located; posterior border of cleithrum approximately aligned with center of basipterygium (or more posterior) [35-1]; (6) ligastyle with one axis [46-1]; and (7) adult males with anterior process on base of fifth middle anal-fin radial pointed and upward directed [78-1].