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Bajaichthys

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This is an old revision of this page, as edited by Colin Douglas Howell (talk | contribs) at 22:46, 14 November 2021 (Add "(middle Eocene)" after Lutetian in lead to provide a better-known "landmark" for those unfamiliar with the Lutetian age.). The present address (URL) is a permanent link to this revision, which may differ significantly from the current revision.

Bajaichthys
Temporal range: Lutetian
Scientific classification
Kingdom:
Animalia
Phylum:
Chordata
Class:
Actinopterygii
Order:
Zeiformes
Family:
Bajaichthyidae
Genus:
Bajaichthys
Species:
B. elegans

Bajaichthys elegans is an extinct Lutetian (middle Eocene) zeid from the Monte Bolca Lagerstätten.

Anatomy and appearance

The holotype is four centimeters in length. It has a deep, oblong-shaped body, a deep, but short head, a long tail composed of 27 caudal vertebrae, a long, crest-like dorsal fin, a long, banner-like anal fin with 29 to 30 rays running from the posterior region of the body down the entire length of the tail, and two enormous, wing-like pelvic fins.[1]

The holotype (and only known specimen) was originally described as the remains of a larval ("youthful") form due to its small size and due to its strong similarity to the larval form of trachypterid ribbonfish.[1]

Taxonomic status

Bajaichthys elegans' taxonomic has been debated since its description in 1983. Because it appeared to combine features of both taeniosomid lamprids (i.e., its larval form resembles those of oarfish and ribbonfish), and of bathysomid lamprids (the anatomy of the pelvis is extremely similar to that of sailfins[1]), it was attributed to an incertae sedis position within Lampriformes. Further research placed it within Zeiformes, another group of acanthomorph teleosts.[2]

References

  1. ^ a b c d Sorbini, L., Bottura, C., "Bajaichthys elegans, AN EOCENE LAMPRIDIFORM FROM BOLCA (ITALY)" Museo Civico di Storia Naturale, Verona 1987
  2. ^ Donald Davesne; Giorgio Carnevale; Matt Friedman (2017). "Bajaichthys elegans from the Eocene of Bolca (Italy) and the overlooked morphological diversity of Zeiformes (Teleostei, Acanthomorpha)". Palaeontology. 60 (2): 255–268. doi:10.1111/pala.12280.


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