Thalassiothrix is a genus of protist belonging to the family Thalassionemataceae.
The genus was described in 1880 by Cleve and Grunow.
Species: Thalassiothrix acuta G. Karsten, 1905 Thalassiothrix antarctica A. Schimper ex G. Karsten, 1905 Thalassiothrix fruaenfeldii (Grunow) Grunow, 1880 Thalassiothrix gibberula G.R. Hasle Thalassiothrix heteromorpha Karsten, 1907 Thalassiothrix longissima Cleve & Grunow, 1880 Thalassiothrix mediterranea Pavillard Thalassiothrix miocenica H.J. Schrader Thalassiothrix monospina H.J. Schrader Thalassiothrix robusta (H.J. Schrader) F. Akiba Thalassiothrix spathulata G.R. Hasle
References