Karenia mikimotoi   (Miyake et Kominami ex Oda, 1935) G. Hansen et Moestrup,  2000 (Dinoflagellate)
Organism information awaits expert curation
Class: Peridinea

Image copyrights: Robin Raine

Size: Cell length is 18-40 µm; width 14-35 µm.

It is a photosynthetic species with several oval to round yellow-brown chloroplasts, each with a pyrenoid. The large ellipsoidal nucleus is located in the left hypothecal lobe. No thecal plates are present. Cells are small, broadly oval to almost round and compressed dorso-ventrally. Cells are slightly longer than wide with a characteristic long and straight apical groove to the right of the sulcal axis. The apical groove extends from the ventral side to the dorsal side of the epitheca creating a slight indentation at the apex of the cell. The epitheca is broadly rounded and smaller than the hypotheca. The hypotheca is notched by the widening sulcus at the antapex resulting in a lobed posterior. The wide and deeply excavated cingulum is pre-median, and is displaced in a descending spiral about 2 times its width. The sulcus slightly invades the epitheca extending from above the cingulum to the antapex. Cells have a distinct swimming pattern: turning over through water, like a falling leaf.

Synonym (s)
Gymnodinium mikimotoi Miyake et Kominami ex Oda, 1935
Gymnodinium nagasakiense Takayama et Adachi, 1984
Gyrodinium nagasakiense Takayama et Adachi, 1984
Gymnodinium nagasakiense Takayama & Adachi, 1985
(Heterotypic synonym)

Common Name (s)
Economic Importance and Threats
Importance:  Ecosystem balance, Dangers
(It is a major cause of algal blooms throughout the world.
It is reported to cause fish and invertebrate mortality.
A cytotoxic polyether, named Gymnocin-A, has been isolated from a Japanese culture.)



• Karnataka, Old Port of Mangalore (Lat: 12.86) (Long: 74.88) INDIA (Record: 28/12/2005 - 13/01/2006)

Literature Source(s)
  • Harnstrom, k; Karunasagar, I and Godhe, A (2009) Phytoplankton species assemblages and their relationship to hydrographic factors-a study at the old port in Mangalore, coastal Arabian sea Indian journal of marine sciences NISCAIR 38(2) 224-234 Available at - http://nopr.niscair.res.in/handle/123456789/4673
  • Society for the Management of European Biodiversity Data (2009) World Register of Marine Species (WoRMS) Available at - http://www.marinespecies.org
  • (2006) Algaebase Available at - http://www.algaebase.org/

Page last updated on:2012-02-06

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