Polymerichthys

Polymerichthys nagurai is an extinct, superficially eel-like alepisauroid from the Middle Miocene of Japan. The holotype specimen, no. 6599, was originally collected by Masayasu Nagura, a suzuri maker, around 1927. The specimen demonstrates several features typical of other families of Alepisauroidei, including head anatomy very similar to the daggertooths of Anotopteridae, and a well-developed dorsal fin similar to that of the lancetfish of Alepisauridae.[1]

Polymerichthys
Temporal range: Middle Miocene
Comparison of Longnosed lancetfish and P. nagurai
Scientific classification
Kingdom:
Animalia
Phylum:
Chordata
Superclass:
Osteichthyes
Class:
Actinopterygii
Order:
Aulopiformes
Suborder:
Alepisauroidei
Family:
Polymerichthyidae
Genus:
Polymerichthys
Species:
P. nagurai
Binomial name
Polymerichthys nagurai
Uyeno, 1967[1]

Etymology

The generic name literally translates as "many meristic fish," in reference to how the fish has numerous meristics units, including how the dorsal fin, which runs down the length of the body starting from behind the head, has somewhere between 300 and 350 rays, and how it has at least 186 vertebrae. The specific name honors the holotype's discoverer, Yuzo Nagura.[1]

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See also

Other notable extinct Cenozoic aulopiforms include:

References
  1. Uyeno, Teruya. "A Miocene alepisauroid fish of a new family, Polymerichthyidae, from Japan." Bull. Nat. Sci. Mus 10 (1967): 383-394.


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