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GAMBIERDISCUS YASUMOTOI SP. NOV. (DINOPHYCEAE), A TOXIC BENTHIC DINOFLAGELLATE FROM SOUTHEASTERN ASIA
Author(s) -
Holmes Michael James
Publication year - 1998
Publication title -
journal of phycology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.85
H-Index - 127
eISSN - 1529-8817
pISSN - 0022-3646
DOI - 10.1046/j.1529-8817.1998.340661.x
Subject(s) - biology , dinophyceae , dinoflagellate , benthic zone , botany , coelenterata , genus , cnidaria , ecology , coral , phytoplankton , nutrient
A new, toxin‐producing, benthic dinoflagellate named Gambierdiscus yasumotoi sp. nov. was isolated from macroalgae from the fringing coral reef surrounding the Singapore island of Pulau Hantu. The plate formula of G. yasumotoi is P o , 3′, 7", 6c, 6s, 5"′, and 2"". Gambierdiscus yasumotoi has a globular shape and is not anterior‐posteriorly compressed as are the two other known species in this genus, G. toxicus Adachi et Fukuyo 1979 and G. belizeanus Faust 1995. The girdle descends one to two girdle widths without overhang in contrast to the ascending girdles of G. toxicus and G. belizeanus. The dimensions of cultured G. yasumotoi were 45–63 μm in length, 38–50 μm in transdiameter and 43–61 μm in dorsoventral diameter. The thecae are smooth without areolae. The apical pore plate has the characteristic fishhook shape of Gambierdiscus, but it is significantly longer than G. toxicus. Cells from young cultures of G. yasumotoi are positively phototropic.