clitellum generally only two or three segments and more anterior in position than in Terricolae.
clitellum not present as a definite organ, as in Oligochaeta.
clitellum always present, extending over two (many limicolous forms) to forty-five segments (Alma).
clitellum, kli-tel′um, n. the saddle of an annelid, as the earthworm:—pl.
clitellum commonly extensive and more posterior in position than in other groups.
"raised band around an earthworm," 1816, Modern Latin, from Latin clitellae "a pack-saddle," diminutive of *clitra "litter," from PIE *klei-tro-, from root *klei- (see lean (v.)). Related: Clitellar.