Ditylum is a genus of diatoms belonging to the family Lithodesmiaceae.
The genus has cosmopolitan distribution.
Species: Ditylum brightwellii Ditylum buchananii Ditylum cornutum Ditylum ehrenbergii Ditylum grovei Ditylum inaequale Ditylum pernodi Ditylum segmentale Ditylum sol Ditylum trigonum Ditylum trigonum
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