Heteronectes: Difference between revisions
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'''''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]]''.<ref>{{cite journal|author=Matt Friedman|title=The evolutionary origin of flatfish asymmetry|journal=Nature|volume=454|date=2008-07-10|pages=209–212|doi= 10.1038/nature07108|pmid=18615083|issue=7201}}</ref><ref>{{cite journal|journal=Journal of Vertebrate Paleontology|volume=21|issue=4|year=2012|pages=735–756|author=Matt Friedman|title=Osteology of ''Heteronectes chantey'' (Acanthomorpha, Pleuronectiformes), an Eocene stem flatfish, with a discussion of flatfish sister-group relationships|doi=10.1080/02724634.2012.661352}}</ref> |
'''''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]]''.<ref>{{cite journal|author=Matt Friedman|title=The evolutionary origin of flatfish asymmetry|journal=Nature|volume=454|date=2008-07-10|pages=209–212|doi= 10.1038/nature07108|pmid=18615083|issue=7201}}</ref><ref>{{cite journal|journal=Journal of Vertebrate Paleontology|volume=21|issue=4|year=2012|pages=735–756|author=Matt Friedman|title=Osteology of ''Heteronectes chantey'' (Acanthomorpha, Pleuronectiformes), an Eocene stem flatfish, with a discussion of flatfish sister-group relationships|doi=10.1080/02724634.2012.661352}}</ref> |
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The evolutionary transition from a symmetric position of eyes in many fish to the position of both eyes on the same side of the head in flatfish was cited as a transition difficult to imagine by [[St. George Jackson Mivart]]. This was presented as a difficulty for gradual evolution. The discovery, in 2008, of ''Heteronectes'' and ''Amphistium'' was considered a vindication of the viability of such a transition.<ref>{{cite journal|title=The Evolution of Extraordinary Eyes: The Cases of Flatfishes and Stalk-eyed Flies|last=Zimmer|first=Carl|authorlink=Carl Zimmer|journal=Evolution Education Outreach|year =2008|volume=1|page=487|doi=10.1007/s12052-008-0089-9}}</ref> |
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''Heteronectes'' is found in the early to middle [[Eocene]] of France. |
''Heteronectes'' is found in the early to middle [[Eocene]] of France. |
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Revision as of 11:53, 6 March 2017
| Heteronectes Temporal range:
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Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Actinopterygii |
| Order: | Pleuronectiformes |
| Genus: | †Heteronectes Friedman, 2008 |
| Species: | †H. chaneti
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| Binomial name | |
| †Heteronectes chaneti Friedman, 2008
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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]
The evolutionary transition from a symmetric position of eyes in many fish to the position of both eyes on the same side of the head in flatfish was cited as a transition difficult to imagine by St. George Jackson Mivart. This was presented as a difficulty for gradual evolution. The discovery, in 2008, of Heteronectes and Amphistium was considered a vindication of the viability of such a transition.[3]
Heteronectes is found in the early to middle Eocene of France.
References
- ^ Matt Friedman (2008-07-10). "The evolutionary origin of flatfish asymmetry". Nature. 454 (7201): 209–212. doi:10.1038/nature07108. PMID 18615083.
- ^ 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.
- ^ Zimmer, Carl (2008). "The Evolution of Extraordinary Eyes: The Cases of Flatfishes and Stalk-eyed Flies". Evolution Education Outreach. 1: 487. doi:10.1007/s12052-008-0089-9.
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