Acanthostega
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Acanthostega, from Ancient Greek ἄκανθα, meaning "spine", and στέγη, meaning "roof", is an extinct genus of stem-tetrapod, among the first vertebrate animals to have recognizable limbs. It appeared in
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Holotype skull, Zoological Museum of Copenhagen
Simplified phylogeny of the fish–tetrapod transition.
Eucritta 1DB white background
Tetrapodomorpha
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Tetrapodomorpha is a clade of vertebrates consisting of tetrapods and their closest sarcopterygian relatives that are more closely related to living tetrapods than to living lungfish. Advanced forms t
Acanthostega
…Acanthostega, from Ancient Greek ἄκανθα (ákantha), meaning "spine", and στέγη (stégē), meaning "roof", is an extinct genus of stem-tetrapod, among the first vertebrate animals to have recognizable limbs. It appeared in the late Devonian period (Famennian age) about 365 million years ago…
Panderichthys fish
Extant tetrapoda
Tiktaalik, a tetrapodomorph with wrists, straddles the fish-tetrapod divide