Madanidinium loirii gen. et sp nov. (Dinophyceae), a new marine benthic dinoflagellate from Martinique Island, Eastern Caribbean

Type Article
Date 2014-04
Language English
Author(s) Chomerat NicolasORCID1, Bilien GwenaelORCID1
Affiliation(s) 1 : IFREMER, LER Bretagne Occidentale, Stn Biol Marine, F-29900 Concarneau, France.
Source European Journal Of Phycology (0967-0262) (Taylor & Francis Ltd), 2014-04 , Vol. 49 , N. 2 , P. 165-178
DOI 10.1080/09670262.2014.898797
WOS© Times Cited 11
Note This work was supported by the Contrat de projet État-Région (PIDETOX) and is a contribution to the Brittany Culture Collection project (Souchothèque de Bretagne). The following supplementary material is accessible via the Supplementary Content tab on the article’s online page at
Keyword(s) Caribbean, benthic, Dinophyceae, SEM, phylogeny, morphology, taxonomy, Martinique, rDNA
Abstract A new benthic phototrophic dinoflagellate is described from sediments of a tropical marine cove at Martinique Island and its micromorphology is studied by means of light and electron microscopy. The cell contains small golden-brown chloroplasts and the oval nucleus is posterior. It is laterally compressed, almost circular in shape when viewed laterally. It consists of a small epitheca tilted toward the right lateral side and a larger hypotheca. In the left view, the cingulum is more anterior and the epitheca is reduced. The cingulum is displaced and left-handed. This organism is peculiar in having no apical pore and its thecal plate arrangement is 2 ' 1a 7 '' 5c 3s 5 ''' 1 ''''. The plates are smooth with small groups of pores scattered on their surface. An area with 60-80 densely arranged pores is found near the centre of the 2 ''' plate, on the left lateral side. Morphologically, these features are different from all other laterally compressed benthic genera. In addition, molecular genetic sequences of SSU and partial LSU form a distinct and well-supported clade among dinoflagellates and support the erection of a new genus. However, molecular phylogenies inferred from ribosomal genes failed to confirm any clear relationship with other benthic taxa and affinity with other laterally compressed dinoflagellates has not been demonstrated. Hence, the taxonomic affinity of Madanidinium loirii with a defined order and family is unclear at the moment.
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