Diagnosis: Shell stout, thick-walled, nearly triangular in lateral view. Dorsal wall broadly rounded, convex; ventral wall narrow, slightly convex. Aboral wall flattened to slightly concave. Ventral corner may expand into rounded projection. Peristome process long and twisted, originating from one side of dorsal mid-line, and extending into 2 asymmetrical, flange-like teeth.
Length (including process): 0.15-0.18 mm.
Kingdom Protoctista Phylum Actinopoda Subphylum Sarcodina Class Phaeodaria Order Phaeogromia Family Challengeridae Genus Protocystis Species Protocystis triangularis
Status in World Register of Marine Species
Not included in WoRMS database
Sorry, there are no scientific synonyms and common names available for this species
Peters N. 1929. Die tripyleen Radiolarien der Weddell-See. Internat. Rev. Ges. Hydrobiol. Hydrogr., 21:383-401.
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