Physical Description

Diagnostic Description

Description

Distribution: Atlantic, Indian, and Pacific Oceans. Scaleless. No swim bladder. Dorsal fin continuous with anal fins. Eyes rudimentary. Opercular spine weak, if present. No pyloric caeca. Pelvic fin jugular with a single ray; lacking in a few. Total vertebrae 68-86: precaudal 26-48. Neotenic in some features. Mostly found beyond 700 m depth.
  • MASDEA (1997).
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Source: World Register of Marine Species

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Molecular Biology and Genetics

Molecular Biology

Statistics of barcoding coverage

Barcode of Life Data Systems (BOLD) Stats
Specimen Records:3
Specimens with Sequences:3
Specimens with Barcodes:3
Species:2
Species With Barcodes:2
Public Records:0
Public Species:0
Public BINs:0
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© Barcode of Life Data Systems

Source: Barcode of Life Data Systems (BOLD)

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Wikipedia

Aphyonidae

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 2,000 metres (6,600 ft) and 6,000 metres (20,000 ft) depth.[1]

Description and biology[edit source | edit]

Aphyonids are small fishes, typically about 10 centimetres (3.9 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.[1]

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.[1]

References[edit source | edit]

  1. ^ a b c Nielsen, Jørgen G. (1998). Paxton, J.R. & Eschmeyer, W.N., ed. Encyclopedia of Fishes. San Diego: Academic Press. p. 134. ISBN 0-12-547665-5. 
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