FIGURE 4 in Dendrochirotida (Echinodermata: Holothuroidea) from the northeastern coast of Brazil

FIGURE 4. Parathyone braziliensis (Verrill, 1868), UFPB.ECH-1063. A, external view of the animal; B, animal in natural environment; C, dorsal view of the calcareous ring, detail of radial plate; D, dorsal view of the calcareous ring, detail of interradial plate; E, ventral view of the calcareous ring, detail of radial plate; F, ventral view of the calcareous ring, detail of interradial plate. Where, IRd = dorsal interradial plate; Rd = dorsal radial plate; IRv = ventral interradial plate; Rv = ventral radial plate; PA = point of attachment of the retractor muscles and notch for the passage of radial nerves. (Figure B by Alvaro Borba).