Aphyonidae
{{Short description|Family of fishes}}
{{Automatic taxobox
| image = Aphyonus gelatinosus1.jpg
| image_caption = Aphyonus gelatinosus
| taxon = Aphyonidae
| authority = D. S. Jordan & Evermann, 1898
| subdivision_ranks = Genera
| subdivision =
Aphyonus Günther, 1878
Barathronus Goode & Bean, 1886
Meteoria Nielsen, 1969
Nybelinella Nielsen, 1972
Paraphyonus Nielsen, 2015 Nielsen, J.G. (2015): Revision of the aphyonid genus Aphyonus (Teleostei, Ophidiiformes) with a new genus and two new species. Zootaxa, 4039 (2): 323–344.
Parasciadonus Nielsen, 1984
Sciadonus Garman, 1899
}}
Aphyonidae is a family of eel-like fishes in the order Ophidiiformes. They are found in tropical and subtropical waters throughout the world. They are deep-sea fishes, living between {{convert|2000|m|ft}} and {{convert|6000|m|ft}} depth.{{cite book |editor1=Paxton, J.R. |editor2=Eschmeyer, W.N. |author= Nielsen, J.G.|year=1998|title=Encyclopedia of Fishes|publisher= Academic Press|location=San Diego|page= 134|isbn= 0-12-547665-5}}
Description and biology
Aphyonids are small fishes, typically about {{convert|10|cm|in}} long when fully grown. They have transparent, gelatinous skin, which lacks any scales. The dorsal, caudal and anal fins are united into a single ribbon. Most species are neotenic, showing a number of features as adults that are more commonly associated with fish larvae. For example, the skeleton is only partially calcified, and the muscles and gills are underdeveloped. The eyes, nasal organ and lateral line are also reduced, and they lack a swim bladder.
The aphyonids are viviparous, giving birth to live young. The males bundle their sperm into small sacs (spermatophores), so that they can be stored for extended periods. This allows them to mate with immature females, which can then store the sperm inside the ovaries until they reach sexual maturity, and the eggs are ready to be fertilised. This unusual adaptation is likely a response to the difficulty of finding a mate in their dark and sparsely inhabited deep-sea environment.
References
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{{Taxonbar|from=Q631062}}
Category:Taxa named by David Starr Jordan
Category:Taxa named by Barton Warren Evermann
{{Ophidiiformes-stub}}