Casineria had five fingers, with the bones at the finger tip being tapering and curved. This spurred the initial describers to argue that it was the oldest known animal with claws on each hand, and marks the earliest clawed foot. Claws are extremely rare among amphibians, but ubiquitous among amniotes, so their supposed presence in Casineria has been considered to be evidence towards its amniote identity. Claws are also a feature intimately bound to the formation of keratinous scales in reptiles, so in life, "Casineria" would have borne scaly, reptilian-type skin, and would have resembled a small lizard (despite being completely unrelated to true lizards).