Holothuria (Irenothuria)

Deichmann, 1958

1 species

Large forms 20 cm or more, cylindrical to bottle shaped, with 20 tentacles of moderate size and almost terminal position. Ventral tube feet large, arranged in irregular double rows; dorsally the feet more papilliform and arranged in the same manner. Calcareous ring delicate, low, with one polian vesicle and one free stone canal with round head. Cuvierian organs present in some individuals. Spicules a crowded layer of tables. Largest tables with a disc about 0.2 mm in diameter, with numerous holes and a tall spire with a crossbeam near the base and four long pillars turning outward near the tips, each tapering to a point. Smaller tables also present especially in the appendages with shorter spire, often reduced to 1 to 4 knobs or completely lacking. Ventral tube feet with large end plate, dorsal papillae with no end plate, but sometimes a few supporting rods with a few perforations near the ends. (Rowe, 1969)