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Abstract
The araphid diatom Licmophora hyalina's motility was observed in cultured material. Gliding movement was nearly straight and only towards the broader pole, and the colonies rotated. Although mucilage secretion was not observed with the light microscopy, the links between motility and the labiate process and/or the multiscissura are suggested. Other motile members in non-raphid (centric and araphid) diatoms are briefly reviewed. Several non-raphid species exhibit motility, suggesting that there might be more motile araphid diatoms.
