The intracellular origin of flagellar hairs in the dinoflagellate Woloszynskia micra leadbeater & dodge

ABSTRACT The arrangement of fine hairs on the longitudinal and transverse flagella of Woloszynskia micra is illustrated and discussed. Dilations of the nuclear envelope and endoplasmic reticulum in W. micra, similar in appearance and location to those containing flagellar hairs in other algal and fungal zoids, are found to contain bundles of fibrils. These fibrils are approximately the same width and length as the flagellar hairs. For the above reasons it is now considered that the flagellar hairs in the dinoflagellate W. micra are formed intracellularly within dilations of the nuclear envelope and endoplasmic reticulum and later deposited on the flagella.