Ichthyological terms, not general ones.
Translucent, triangular area in the humeral region, behind the opercle, without muscle and where the anterior part of the gas bladder is in direct contact with the skin. It is hypothesised to function as a hearing aid in many juvenile characoids and is present in adults of certain species, notably members of the family Cheirodontidae.
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Generic term for any lake formed in a rift valley, but often used in specific reference to a group located in the East African rift, particularly those lying in its western and southern sections, i.e., the African Great Lakes. In the aquarium hobby the meaning of the term is typically restricted even further to include just lakes Malawi, Tanganyika, and Victoria, the latter of which is not in fact a rift lake and is located in a shallow depression between the eastern and western branches of the main rift. These three lakes are famous for the high number of endemic fish species inhabiting them, especially members of the family Cichlidae.
A taxonomic group or category of any rank, such as a species, genus family, or class.
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External, umbilical cord-like structure present in members of the family Goodeidae and some other fish groups responsible for transfer of nutrients between an adult female and her internally-developing young. May still be attached to fry at birth.
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Can be used to refer to any taxonomic group, the characteristics of which are used for defining related, higher or lower ranking groups. For example, the type of a nominal species is a specimen (type specimen), the type of a nominal genus is the nominal species (type species), and the type of a nominal family is the nominal genus (type genus).
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Horny projection originating from a single cell of the epidermis found on the disc of Garra sp. and catfishes of the family Sisoridae, for example.
Giving birth to living offspring that develop within the mother's body, e.g., most mammals, many reptiles, some fishes. There is a direct placental or equivalent connection to the mother, meaning that members of the family Poeciliidae are not strictly viviparous and more correctly referred to as ovoviviparous.
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In taxonomy, the group ranking below subfamily with a name typically ending in '-ini'.
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