Hoppenrath, M. (2000). Morphology and taxonomy of the marine sand-dwelling genus Thecadinium (Dinophyceae), with the description of two new species from the North German Wadden Sea. Phycologia. 39(2): 96-108.

238114

10.2216/i0031-8884-39-2-96.1 [view]

Hoppenrath, M.

2000

39(2): 96-108

Publication

http://www.phycologia.org/doi/abs/10.2216/i0031-8884-39-2-96.1

Five marine sand-dwelling species of the dinoflagellate genus Thecadinium have been examined from intertidal and subtidal sand and illustrated with light and scanning electron microscopy. Additional information on the known species is provided. The type species, Thecadinium kofoidii, has the plate formula P 3' 1a 4? 5(6?)c 5s 4'? 1?? the sulcal plates and one more postcingular plate are described. Thecadinium kofoidii is so far the only Thecadinium species possessing chloroplasts. The first light microscopical observations of Thecadinium neopetasatum are reported, and the plate formula is emended to P 3' 1a 6? 6c ?s 5'? 1 ??, with one more epitheca and two more hypotheca plates. The first scanning electron microscopical observations of Thecadinium dragescoi are reported, and the plate formula is emended to P 5' 2a 8? 6(7?)c ?s 4'? x 2p 1??, with two newly described apical intercalary plates and the ‘x’ plate. Two species are described as new. Thecadinium ornatum Hoppenrath sp. nov. is flattened laterally with a cell size of 45.0–55.5 µm long and 39.5–46.5 µm wide, a length/width ratio of 1.11–1.22 and a descending cingulum. The plate formula is 4' 6? 6c 6s 5'? 1 ??. Thecadinium acanthium Hoppenrath sp. nov. is flattened laterally with a cell size of 50.0–64.0 µm long and 37.5–51.0 µm wide, with a length/width ratio of 1.20–1.35 and a descending cingulum. The plate formula is 4' 6? 6c ?s 5'? 1??.

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