Habitus of adult Maritigrella crozieri . (A) Side view of a specimen gliding on the wall of a glass tank with undulating motions of the margins, illustrating the dorsoventral flatness. (B) Largest specimen found so far, about 56 mm in length in quiet position. Inset at top left is another specimen after about 4 months of starvation, with a measured length of 5.6 mm, one-tenth that of the large specimen. Note the darker colour of the starved specimen. (C) Dorsal view of the anterior part, with elongated tentacles and two merging patches of cerebral eyes (ey). (D) Ventral view of the anterior part with immersed tentacular eyes (ey). (E) Ventral view with mouth opening (mo) below a slitlike fold, the male genital opening (mg), the female genital opening (fg) and the sucker (su). Parts (C) through (E) show the same specimen.