Extubocellulus brasiliensis (Bacillariophyceae), a new species from southern Brazilian marine sandy beaches

Abstract

A new diatom species Extubocellulus brasiliensis M.Garcia belonging to the family Cymatosiraceae is described from Brazilian beaches of South Atlantic Ocean. Extubocellulus brasiliensis M.Garcia was found in marine sandy beaches forming a short colony (4 cells). It is characterized by the presence of a one row of round areolae occluded by an external cribrum between the valve face and the mantle, and an ocellulus located symmetrically at each apex composed of 4 porelli.