Heteronectes chaneti is a fossil fish which has been identified as a primitive flatfish, dating to the early Eocene (Lutetian stage) of France. Heteronectes is reported to be 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) to its Italian relative Amphistium. The rest of the skeleton also has some primitive features in common with other Percomorph groups, but absent in living flatfishes.
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| - Heteronectes (de)
- Heteronectes (en)
- Heteronectes chaneti (ru)
- 原始比目鱼 (zh)
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| - Heteronectes ist eine 47 Millionen Jahre alte, ausgestorbene Gattung aus der Ordnung der Plattfische, deren Typusart, Heteronectes chaneti, anlässlich ihrer Erstbeschreibung als „der primitivste bekannte Plattfisch“ bezeichnet wurde. Das eine Auge des Tieres befindet sich an der für Fische üblichen seitlichen Position, das andere hingegen auf der entgegengesetzten Kopfseite weit über der bei Fischen üblichen Position, unmittelbar neben der Dorsallinie (Rückenmitte). Als Mosaikform nimmt diese Art – gemeinsam mit vergleichbar alten Vertretern der Gattung Amphistium – eine vermittelnde Stellung zwischen den bilateral symmetrischen Fischen und den Plattfischen ein. (de)
- Heteronectes chaneti (лат.) — вид вымерших лучепёрых рыб из отряда камбалообразных, единственный в роде Heteronectes. Известен по ископаемым остаткам из среднеэоценовых (ипрских) отложений Италии. (ru)
- 原始比目鱼（学名heteronectes）,是一种已灭绝的比目鱼，生存于始新世的欧洲。 (zh)
- Heteronectes chaneti is a fossil fish which has been identified as a primitive flatfish, dating to the early Eocene (Lutetian stage) of France. Heteronectes is reported to be 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) to its Italian relative Amphistium. The rest of the skeleton also has some primitive features in common with other Percomorph groups, but absent in living flatfishes. (en)
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| - Heteronectes ist eine 47 Millionen Jahre alte, ausgestorbene Gattung aus der Ordnung der Plattfische, deren Typusart, Heteronectes chaneti, anlässlich ihrer Erstbeschreibung als „der primitivste bekannte Plattfisch“ bezeichnet wurde. Das eine Auge des Tieres befindet sich an der für Fische üblichen seitlichen Position, das andere hingegen auf der entgegengesetzten Kopfseite weit über der bei Fischen üblichen Position, unmittelbar neben der Dorsallinie (Rückenmitte). Als Mosaikform nimmt diese Art – gemeinsam mit vergleichbar alten Vertretern der Gattung Amphistium – eine vermittelnde Stellung zwischen den bilateral symmetrischen Fischen und den Plattfischen ein. (de)
- Heteronectes chaneti is a fossil fish which has been identified as a primitive flatfish, dating to the early Eocene (Lutetian stage) of France. Heteronectes is reported to be 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) to its Italian relative Amphistium. The rest of the skeleton also has some primitive features in common with other Percomorph groups, but absent in living flatfishes. The condition in modern, bottom-dwelling flatfish with both eyes on the same side of the head was cited by St. George Jackson Mivart as difficult to imagine how it could have evolved in a gradual fashion by natural selection, as proposed by Charles Darwin. Many evolutionary biologists agreed, and suggested that modern flatfish anatomy arose as a result of saltation. The 2008 discovery of Heteronectes and Amphistium was considered a vindication of the viability of a gradual transition. Friedman suggested that Heteronectes and Amphistium did not rest completely on the sea floor like modern flatfishes. Instead, they might have only held their tail to the sea floor and kept their head lifted into the water above, using one eye to watch for predators, while the other was used to look for prey in the mud below. From previous fossil findings, Friedman also notes that several modern families of flatfish seems to have coexisted with Heteronectes and Amphistium, and speculated that the modern ones eventually outcompeted their primitive relatives. (en)
- Heteronectes chaneti (лат.) — вид вымерших лучепёрых рыб из отряда камбалообразных, единственный в роде Heteronectes. Известен по ископаемым остаткам из среднеэоценовых (ипрских) отложений Италии. (ru)
- 原始比目鱼（学名heteronectes）,是一种已灭绝的比目鱼，生存于始新世的欧洲。 (zh)
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