The genus lacked spines or keels on these plates, features seen in many other aetosaurs.

It is distinguished from the C. versicolor group in having mixed orientation of dorsal scales, and lacking spines on the head.

They are covered with hair but, unlike most young dragonflies, they lack hooks or spines.

Mesopelagic fish usually lack defensive spines, and use colour to camouflage them from other fish.

All fins lack spines, and the pelvic fins are absent.

It has fuzzy, glandular stems lacking spines and prickles.

They lack spines and have pinnately compound leaves.

The shell morphology is very variable, with some individuals totally lacking spines.

Recluses have no obvious coloration patterns on the abdomen or legs, and the legs lack spines.