Vannella mira (Schaeffer, 1926) emend. Smirnov, 2002

 

Diagnosis: In locomotion fanshaped, semicircular or (rarely) spatulate. Prominent folds or lobes on the frontal hyaloplasm. Single vesicular nucleus, about 6 µm diameter with central spherical endosome about 3 µm diameter. Floating form nonsymmetrical, with up to 11 straight or coiled pseudopodia, often with distinct conical thickening of the basement. Pseudopodia of the floating form have rounded, not pointed ends and are relatively thick.

 

Dimensions: Length and breadth of the locomotive form 15-35 m; (average length 28.5 m; average breadth 26.5 m) l/b ratio 0.5-1.8 (average 1.08).

 

Ecology: bacteriovorous. Marine, brackish water. Ecotopes: cyanobacterial mats, known from shallow coastal waters, bays, tide pools, coral reefs. Distribution: Atlantic and Pacific US coats, Florida, Madagascar, Camarque (France, Mediterranean coast).

 

Remarks: diagnosis: similar in size with V. septentrionalis, V. arabica, V. caledonica and V. anglica. Differs from all these species in the organization of the floating from. In addition, V. arabica has distinct simple filaments among glycostyles, that were not found in V. mira (this feature may be not very reliable). V. anglica has a characteristic uneven frontal edge, that is not a feature of V. mira (see Page, 1979).