Orphnurgus

Théel, 1879

5 species

Tentacles, 15-20 large, non-retractile. Lateral ambulacra of ventral surface with very large pedicels, disposed in a single row along each side of that surface, and with another series of slender flexible processes placed above the pedicels, along each side of body. Odd ambulacrum naked, Dorsal surface with a crowded series of numerous long papillae, disposed in one or two rows along each dorsal ambulacrum. Integument with deposits in the form of smooth or spiny rods, sometimes dichotomously branched, or rods transformed into solid large ellipsoids. (Deichmann, 1930)

Tentacles 15-20, unretractile; discs with ramified processed. Circumoral papillae absent. Deposits spatulated crossed and or rods of greatly varying shape. (Hansen, 1975)