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[3] [4] [5] If the split into multiple genera is not recognized, Rivulus contains more than 150 non-annual killifish species found in fresh and brackish waters of the tropical and subtropical Americas, ranging from Argentina in south to Mexico in north, including the Caribbean region.
Fundulus auroguttatus, a non-annual North American killifish similar to Fundulus chrysotus known as a topminnow. A small number of species will shoal while most are territorial to varying degrees. Populations can be dense and territories can shift quickly, especially for species of the extreme shallows (a few centimetres of water).
Nothobranchius rachovii, the bluefin notho, is a species of freshwater annual killifish from Mozambique. [2] It can grow up to 6 cm (2.4"). [ 3 ] It is popular among killifish enthusiasts, who raise them from eggs in aquaria.
Kryptolebias is a genus of killifish in the family Rivulidae mostly native to warm parts of South America but with one species (K. marmoratus) found north through the Caribbean region to the Gulf Coast states of the United States. They are small fish, up to 7.5 cm (3.0 in) in total length. [2] They are non-annual killifish. [3]
Similar to closely related genera such as Anablepsoides, Cynodonichthys, Laimosemion and Melanorivulus, Atlantirivulus are non-annual killifish. [4] They are small fish, no more than 6.5 cm (2.6 in) in total length. [5] Compared to many species in the family, the colors of Atlantirivulus are relatively dull. [3]
These annual killifish are endemic to seasonal waters (like pools) in the Paraguay, Tocantins–Araguaia, Xingu and Mamoré–Grande basins in Bolivia, Brazil and Paraguay. [ 2 ] [ 3 ] [ 4 ] Each species generally has a small distribution and some are seriously threatened by habitat loss ; the entire known range of S. reticulatus is in the area ...
Simpsonichthys is a genus of killifish from the family Rivulidae the species of which are endemic to temporary freshwater habitats like ponds in the upper Paraná, upper Araguaia, upper Jequitinhonha and São Francisco basins on the central Brazilian Plateau. [1] They are small annual killifish that reach up to 5.5 cm (2.2 in) in standard ...
This annual killifish inhabits ephemeral pools in semi-arid areas with scarce and erratic precipitations and have adapted to the routine drying of their environment by evolving desiccation-resistant eggs that can remain dormant in the dry mud for one and maybe more years by entering into diapause.