In all these families spines and glandular papillae may be super-added.
Having no spines to their fins, the Gadids used, in Cuvierian days, to be associated with the herrings, Salmonids, pike, &c., in the artificially-conceived order of Malacopterygians, or soft-finned bony fishes.
Males of the little water-bugs of the genus Corixa make a shrill chirping note by drawing a row of teeth on the flattened fore-foot across a group of spines on the haunch of the opposite leg.
The spines are mixed with long soft hairs.
The body is uniformly covered with granular scales, whilst the short, strong tail is armed with powerful spines disposed in whorls.