Specimens of Gordius sp., ventral view of posterior ends and cuticle in midbody sections. The specimen number is indicated in the lower left of each image. A, B, G. Posterior ends with postcloacal crescent (pcc) and cloacal opening (co). The cuticular surface (C–F, H) is in some cases covered with encrusting material (C) or dirt (F, H). Diagonal lines are created by muscular fibers underlying the cuticle.