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Chaetoceros  Ehrenberg, subgenus Hyalochaete Gran, section Compressa contains the species  Ch. compressus  Lauder 1864 and  Ch. contortus  Schütt 1895. On the basis of apparent intermediate forms, they were synonymized by Gran and Yendo. Rines and Hargraves suggested that they might be distinct taxa. Light and electron microscopy studies of a wide range of material supports that opinion, although further study of  Ch. compressus sensu  Lauder from the Indo-West Pacific is needed. Differences of opinion as to whether these taxa should be combined or considered distinct can be attributed to increased knowledge of the biology of diatoms, and advances in systematic theory.

botanica marina

Morphology and Taxonomy of  Chaetoceros contortus  Schütt 1895, with Preliminary Observations on  Chaetoceros compressus  Lauder 1864 (Subgenus Hyalochaete, Section Compressa)