Definitions for "Costal grooves"
Keywords:  salamander, groove, hind, rib, hindlimb
The deep, vertical groove on the side of a salamander's body, indicating the position of a rib (Peters 1964)
Bilateral, annular-appearing grooves found on salamanders. Costal grooves indicate the presence of the ribs. Usually, only those costal grooves found between the front and hind legs are counted.
vertical grooves on the sides of a salamander