PATRICIO; FABIOLA; INGRID. Extubocellulus spinifer (Hargraves & Guillard) Hasle, Stosch & Syvertsen (Cymatosiraceae, Bacillariophyceae): First report of the species from the Southeastern Pacific with comments on the variability of some of its morphological features. Gayana Botánica, v. 67, n. 2, p. 153-157, 30 Dec. 2010.