Tomeurus

Tomeurus gracilis is a species of poeciliid fish native to South America, in Brazil, Surinam and Venezuela. This species grows to a length of 3.3 centimetres (1.3 in) TL.[1] It is the only known member of its genus.[2] This specie sis classified in the tribe Cnesterodontini in the 5th edition of Fishes of the World.[3] but other workers place it in its own tribe, the Tomeurini.[4]

Tomeurus
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Cyprinodontiformes
Family: Poeciliidae
Subfamily: Poeciliinae
Tribe: Cnesterodontini
Genus: Tomeurus
C. H. Eigenmann, 1909
Species:
T. gracilis
Binomial name
Tomeurus gracilis

This is a sociable fish which lives in small schools consisting of several dozens of fishes. It is found in muddy creeks or along the sandy-muddy edges of shallow estuaries. It has been observed remaining still just below the surface but it prefers to hide beneath aquatic plants. Fertilisation is internal and, uniquely among the Poeciliinae, the females may then lay eggs placing them individually onto aquatic plants. They can also be facultively ovoviviparous.[1]

References
  1. Froese, Rainer and Pauly, Daniel, eds. (2019). "Tomereus gracilis" in FishBase. August 2019 version.
  2. Eschmeyer, W. N.; R. Fricke & R. van der Laan (eds.). "genid=5536". Catalog of Fishes. California Academy of Sciences. Retrieved 10 November 2019.
  3. J. S. Nelson; T. C. Grande; M. V. H. Wilson (2016). Fishes of the World (5th ed.). Wiley. p. 379. ISBN 978-1-118-34233-6.
  4. Paulo Henrique Franco Lucinda; Roberto E. Reis (2005). "Systematics of the subfamily Poeciliinae Bonaparte (Cyprinodontiformes: Poeciliidae), with an emphasis on the tribe Cnesterodontini Hubbs". Neotropical Ichthyology. 3 (1): 1–60. doi:10.1590/S1679-62252005000100001.
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