Glenodinium trochoideum Stein 1883
G. acuminatum Jorgensen 1899
Peridinium trochoideum Lemmermann 1910
Scrippsiella faeroense Dickensheets & Cox 1971
Morphological Characteristics :
Pyriform cell with conical epitheca. The organism has a wide and excavated girdle which is composed of six plates and surrounded by narrow lists (Dodge 1982). No antapical projecions; sulcus does not indent the antapex; and has everal yellow-brown chrmatophores in the body.
Size of Specimen :
28-35 mm (L); 12-15 mm (W)
Distribution :
Occurs in N. Europe, Atlantic Ocean, West India as well as the South China Sea (Dodge 1982). Frequently recorded together with S. faeroense and is confused by observers. Commonly be found in Tolo Harbour, Hong Kong. Caused frequent red tides in the late eighties.
Major Limiting Factors :
Principally dissolved phosphates; optimal growth at high temperature (>25°C), medium light (3500-4000 lux), supplies of ferrous ions and EDTA, and a low N:P atomic ratio (6-13) in seawater.
Toxicity :
Non-toxic; caused massive fishkills by oxygen depletion.
