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Description of Thecadinium mucosum sp. nov. (Dinophyceae), a new sand-dwelling marine dinoflagellate, and an emended description of Thecadinium inclinatum Balech
Hoppenrath, M.; Saldarriaga, J.F.; Schweikert, M.; Elbrächter, M.; Taylor, F.J.R. (2004). Description of Thecadinium mucosum sp. nov. (Dinophyceae), a new sand-dwelling marine dinoflagellate, and an emended description of Thecadinium inclinatum Balech. J. Phycol. 40(5): 946-961. hdl.handle.net/10.1111/j.1529-8817.2004.03045.x
In: Journal of Phycology. Blackwell Science: New York. ISSN 0022-3646, more
Peer reviewed article  

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Keywords
    Dinoflagellata [WoRMS]; Thecadinium dragescoi Balech, 1956 [WoRMS]; Thecadinium inclinatum Balech, 1956 [WoRMS]; Thecadinium mucosum Hoppenrath & Taylor, 2004 [WoRMS]; Marine
Author keywords
    dinoflagellate; marine sand; small subunit rRNA; taxonomy; Thecadinium dragescoi; Thecadinium inclinatum; Thecadinium mucosum sp. nov.; ultrastructure

Authors  Top 
  • Hoppenrath, M.
  • Saldarriaga, J.F.
  • Schweikert, M.
  • Elbrächter, M.
  • Taylor, F.J.R.

Abstract
    A new thecate, phototrophic, marine, sand-dwelling dinoflagellate, Thecadinium mucosum Hoppenrath et Taylor sp. nov., is described from a culture isolated from Boundary Bay, British Columbia, Canada. It was illustrated with LM as well as SEM and TEM, and its position in the phylogenetic tree of dinoflagellates was investigated using molecular methods. Cells are asymmetrical, oval, laterally flattened, and strongly pigmented, with the plate formula P 3' 1a 6'' 7/8c 5 s 6''' 2''''. Thecal plates are smooth with scattered pores, and there is a distinctive anterior intercalary plate that could be involved in mucus secretion. Thecadinium inclinatum Balech (=Sabulodinium inclinatum (Balech) Saunders et Dodge), a thecate, marine, sand-dwelling species that has been previously confused with what we now call T. mucosum, was also examined and illustrated through LM and SEM. New information on T. inclinatum is provided, including its plate formula P 3' 6'' 7c ?s 5''' 1p 1''''; we consider T. inclinatum to be related to most other Thecadinium species and not to Sabulodinium. Molecular phylogenetic analyses based on the small subunit ribosomal gene of T. mucosum, T. kofoidii (the type species of the genus), and T. dragescoi weakly support earlier suspicions based on morphology that T. dragescoi is not a member of Thecadinium. Tabulational patterns of the species suggest a relationship to the genus Amphidiniopsis.

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