Order Summary for Notacanthiformes
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Main Ref |
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Order |
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Notacanthiformes halosaurs and deep-sea spiny eels |
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Class |
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Actinopterygii |
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Sister Order |
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Albuliformes 80 M years |
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Ref.. |
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First Fossil Record |
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late Cretaceous |
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Occurs in |
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Marine |
Fresh |
Brackish |
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Remark |
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Body eel-like; posteriorly directed spine on dorsal edge of rear of maxilla; premaxilla and maxilla bordering upper jaw; gill membranes separate; pectoral fins relatively high on body; pelvic fins abdominal, with 7-11 rays (the two fins are usually connected by a membrane); anal fin base long and merged with what remains of the caudal fin; caudal fin skeleton reduced or absent; tail easily regenerated when lost; branchiostegal rays 5-23; swim bladder present. Some have photophores. |
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Classetymology |
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Greek aktis = ray, thunderbolt, beam + Greek pterygion, diminutive of pteryx = wing, fin. Ref. 45335. |
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Orderetymology |
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Greek, noton = back + Greek, akantha = thorn + Latin, forma = shape (Ref. 45335). |
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Families |
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Converted to PHP by Kit 06.10.09 |