Whatcheeria
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Whatcheeria is an extinct genus of early tetrapod from the Mississippian of Iowa. Fossils have been found in 340 million year old fissure fill deposits in the town of Delta. The type species, Whatchee
Life restoration
Eucritta 1DB white background
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
Whatcheeria
…unusually narrow skull of Whatcheeria was strongly reinforced by complex modes of contact between its constituent bones, similar to the Devonian tetrapod Acanthostega. The rear of the skull was replete with interdigitating sutures between the bones of the skull roof and cheek, which would have diluted forces of…
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Holotype skull, Zoological Museum of Copenhagen
Simplified phylogeny of the fish–tetrapod transition.