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Squalius
''Squalius'' is a genus of fish in the family Cyprinidae found in Europe and Asia. Hybridization is not rare in the Cyprinidae, including this genus. '' S. alburnoides'' is known to be of ancient hybrid origin, with the paternal lineage deriving from a prehistoric species related to ''Anaecypris''; the latter mated with ancestral '' S. pyrenaicus''. Present-day ''S. alburnoides'' mates with sympatric congeners of other species.Collares-Pereira, M.J. & Coelho, M.M. (2010)Reconfirming the hybrid origin and generic status of the Iberian cyprinid complex ''Squalius alburnoides''.''Journal of Fish Biology, 76 (3): 707–715.'' Species There are currently 52 recognized species in this genus: * ''Squalius adanaensis'' Turan, Kottelat & Doğan, 2013 (Adana chub) Turan, D., Kottelat, M. & Doğan, E. (2013)Two new species of ''Squalius'', ''S. adanaensis'' and ''S. seyhanensis'' (Teleostei: Cyprinidae), from the Seyhan River in Turkey.''Zootaxa, 3637 (3): 308–324.'' * ''Squalius agdamicu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Squalius Alburnoides
''Squalius alburnoides'' is a species of fish in the family Cyprinidae. It is found in Portugal and Spain. Its natural habitats are rivers and intermittent rivers. It may be threatened by habitat loss. This species is a highly peculiar fish in regard to its evolution and reproduction. It has been derived from hybridisation between females of ''Squalius pyrenaicus'' and males of another, unknown cyprinid species, and maintains the genomes of both parental species. ''Squalius alburnoides'' may have various numbers of these genomes (polyploidy), and may use different reproductive modes to pass them on to the offspring, including asexual reproduction, normal meiosis and hybridogenesis. It has the first confirmed instance of natural androgenesis Androgenesis occurs when a zygote is produced with only paternal nuclear genes. During standard sexual reproduction, one female and one male parent each produce haploid gametes(such as a sperm or egg cell, each containing only a single set ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |