It has a blunt front tip with striations on its ventral side separated by a groove.

The dorsal side of the body is a brown color that can vary in shade and pigmentation amount.

There is a thin median longitudinal stripe running down the dorsal side, lighter than the base color.

[2] It is distinguished from other members of Choeradoplana by its brown color and midline, its yellowish margin, an intra-bulbar prostatic vesicle consisting of a large, highly-folded chamber, a short, high, thick penis papilla hanging from the roof of the male atrium under the prostatic vesicle, and the female atrium being three to five times shorter than the male atrium.

[2] The specific epithet is derived from the Latin words crassus and phallus, literally translating to "thick penis".