Present addresses: Okinawa Institute of Science and Technology, Onna, Okinawa 904-0495, Japan;
Testudodinium gen. nov. (Dinophyceae), a new genus of sand-dwelling dinoflagellates formerly classified in the genus Amphidinium
Article first published online: 8 MAY 2012
© 2012 Japanese Society of Phycology
Volume 60, Issue 2, pages 137–149, April 2012
How to Cite
Horiguchi, T., Tamura, M., Katsumata, K. and Yamaguchi, A. (2012), Testudodinium gen. nov. (Dinophyceae), a new genus of sand-dwelling dinoflagellates formerly classified in the genus Amphidinium. Phycological Research, 60: 137–149. doi: 10.1111/j.1440-1835.2012.00645.x
Communicating Editor: M. Hoppenrath.
- Issue published online: 8 MAY 2012
- Article first published online: 8 MAY 2012
- Received 21 December 2011; accepted 29 March 2012.
- benthic dinoflagellate;
- Testudodinium gen. nov
A new genus of sand-dwelling photosynthetic dinoflagellate, Testudodinium Horiguchi, Tamura, Katsumata et A. Yamaguchi is proposed based on Testudodinium testudo (Herdman) Horiguchi, Tamura, Katsumata, et A. Yamaguchi comb. nov. (Basionym: Amphidinium testudo Herdman) and a new species in this new genus, Testudodinium maedaense Katsumata et Horiguchi sp. nov. is described. Amphidinium corrugatum is also transferred to this genus, making a new combination T. corrugatum (Larsen et Patterson) Horiguchi, Tamura et A. Yamaguchi. These three species are similar to the members of the genus Amphidinium in having an extremely small episome and a dorsoventrally flattened cell body. They are, however, distinguished from the genus Amphidinium seusu stricto by the possession of a distinct longitudinal furrow in the middle of ventral side of the episome. Phylogenetic trees based on small subunit (SSU) rDNA revealed that all three of these Testudodinium species formed a robust clade and, although statistical support is not high, the tree suggests Testudodinium clade is not closely related to Amphidinium seusu stricto clade. The morphological differences together with molecular data support the establishment of a new genus for A. testudo and its related species.