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Abbreviation absent according alcohol ambulacrum appearance arranged asper aspersignis sp authors body wall canal coast collection correlation crosses cylindrical deposits derived described Description developed Diagnosis dichotomous ramifications discs distinct Distribution dorsal papillae double rows echinatus elongate ends examined extremities Family figures further genus glaber Gonad Hansen Heding holes Holotype illustrations included increase indicated length less letters Ludwig material Mesothuria mid-ventral Natal number of ventrolateral occasionally original Orphnurgus aspersignis Orphnurgus insignis Fisher pairs perforated placed plates podia present Pseudostichopus R.V. Meiring Naude recorded references Remarks represented ring rudimentary separates short side similar single rows slightly Smith smooth South African Museum southern Africa spatulate rods species specimens spicules spinous rods spiny stout sturdier synonymy tables tentacles terminal Théel thin transformation Type species usually varying ventral Ventrolateral papillae Ventrolateral pedicels whereas