Figure 15. Parathyonidium incertum Heding, 1954. a–c, paratypes NHMUK 2011.171–173. a in Four new species and a new genus of Antarctic sea cucumbers with taxonomic reviews of Cladodactyla, Pseudocnus, Paracucumidae and Parathyonidium (Echinodermata: Holothuroidea: Dendrochirotida)

Figure 15. Parathyonidium incertum Heding, 1954. a–c, paratypes NHMUK 2011.171–173. a, specimen showing large radial tube feet, and smaller tentacle aligned with radius / ambulacrum (oeophagus everted); b, dorsal inter-radial male genital papilla immediately distal to tentacle crown; c, view of tentacle crown with smallest tentacles aligned with radii / ambulacra (denoted by red spot; top right small tentacle obscured by larger tentacle). d–f, specimen NMV F104998. d, SEM images of ossicles from tentacles; e, SEM images of ossicles from dorsal mid-body wall; f, SEM images of ossicles from ventral mid-body wall.