Rev: 06/18/2024
Synonyms:
Tail without terminal setae. One of two genera in the Xyalidae having species inhabiting freshwater, however, most species are marine or in brackish water, especially in interstitial habitats.
Males:
Ref: Andrassy, 1981
Some species of Theristus inhabit freshwater. For example, T. tessae is reported from the Fish River of Namibia (Heyns and Coomans, 1989)
Andrassy, I. 1981. Revision of the order Monhysterida (Nematoda) inhabiting soil and inland waters. Opusc. Zool. Budapest XVII-XVIII:13-47.
Andrassy, I. 1984. Klasse Nematoda (Ordnungen Monhysterida, Desmoscolecida, Araeolaimida, Chromadorida, Rhabditida). Gustav Fischer Verlag, Stuttgart. 509 pp.
Heyns, J and Coomans, A. 1989. A new freshwater species of Theristus from South West Africa/Namibia (Nematoda: Xyalidae) South African Zoology 24:95-98.