| Summary: | In the literature, c. monotis was reported in 1995 to produce cooliatoxin, but subsequent
studies have shown that identification of the species is likely to be incorrect. The present study was
conducted to clarify which species was responsible for cooliatoxin production by re-examination of
the material used in the report of cooliatoxin and of other cultures of C. tropicalis collected from
different sites including the type locality. LSU rDNA was carried out to support the morphological
results. Based on morphological description of C. tropicalis is emended- A phylogenetic analysis
supported the contention that C. tropicalis is a distinct species within the genus Coolia' The identity of
the species responsible for cooliatoxin production was finally revealed. The study clarifies some of the
taxonomic problem, related to benthic dinoflagellates, particularly the genus Coolia'
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