Soft corals contain minute, spiny skeletal elements called sclerites, useful in species identification. In insects, the sterna are usually single, large sclerites, and external. In some females, the sclerites are rolled into a flexible, telescopic ovipositor. Two other specimens of "Diraphora bellicostata" have been found attached to dorsal sclerites. Similarly the ventral sclerites of a body segment are referred to as "sternites". The beetle's exoskeleton is made up of numerous plates, called sclerites, separated by thin sutures. The nymph stages are black or very dark brown, with red integument between the sclerites. The inside of the pharynx was also lined with several rows of pharyngeal sclerites. Greigite has also been identified in the sclerites of scaly-foot gastropods. The larvae are recognized by their unique sclerites of the head, and by their mouthparts. The foot is also unusual, being armored at the sides with iron-mineralised sclerites. In contrast, lobopodians without sclerites may be referred to as "unarmoured lobopodians". The homologies of the various basal sclerites are open to debate. There are traces of thin ribs between the sclerites and the skin. Such sclerites differ considerably between unrelated insects.