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- noun Plural form of
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The authors also looked at late HoxA expression which also differ in the limbs of tetrapods and fins of actinopterygians.
Since the development of a fish whose ancestors branched off fairly early in the evolution of actinopterygians resembles that of the tetrapods, the development of limbs is probably controlled in a way similar to the development of fins in the common ancestor.
The late HoxA expression in Polyodon resembled that of the actinopterygians, not tetrapods.
One lineage led to the ray-finned fishes, or actinopterygians, and they've kept a weak electroreceptive system to this day.
Those examples are more like actinopterygians (ray-finned fishes) vs. sarcopterygians