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Heteronectes chaneti
Temporal range: Middle Eocene
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Superorder: Acanthopterygii
Order: Pleuronectiformes
Genus: Heteronectes
Friedman, 2008
Species: † H. chaneti
Binomial name
Heteronectes chaneti
Friedman, 2008

Heteronectes chaneti is a fossil fish which has been identified as an early relative of the flatfish, and as a transitional fossil. In a typical modern flatfish, the head is asymmetric with both eyes on one side of the head. In Heteronectes, the transition from the typical symmetric head of a vertebrate is incomplete, with one eye positioned near the top of the head, very similar, but less so than its Italian relative, Amphistium.[1][2]

Heteronectes is found in the early to middle Eocene of France.


  1. ^ Matt Friedman (2008-07-10). "The evolutionary origin of flatfish asymmetry". Nature 454 (7201): 209–212. doi:10.1038/nature07108. PMID 18615083. 
  2. ^ Matt Friedman (2012). "Osteology of Heteronectes chantey (Acanthomorpha, Pleuronectiformes), an Eocene stem flatfish, with a discussion of flatfish sister-group relationships". Journal of Vertebrate Paleontology 21 (4): 735–756. doi:10.1080/02724634.2012.661352.