Thalassiosira angulata   (Gregory) Hasle,  1978 (Diatom)
Organism information awaits expert curation
Class: Bacillariophyceae

Image copyrights: Plankton net

Size: Cell diameter 12-39µm.

Color: Yellow brown.

In girdle view the pervalvar axis is usually shorter than the diameter. The valve face is flat and the mantle smoothly curved. The single central connecting thread is distinctly longer than the pervalvar axis. The external tubes of the marginal processes are usually readily seen in light microscopy.
Valve view reveals hexagonal areolae in curved tangential rows, occasionally in straight rows or in sectors. No distinct central areola. The marginal processes have widely spaced long external tubes. The labiate process is large and always located closely to one of the marginal strutted processes. There is a sharp distinction between the valve mantle and the valvocopula.

Reproduction is general for group: both sexual and asexual.

Synonym (s)
Coscinodiscus eccentricus var. decipiens Grunow, 1878
Orthoseira angulata Gregory, 1857
Thalassiosira decipiens (Grunow) E. Jorgensen, 1905
Thalassiosira decipiens (Grunow) E. Jorgensen, 1979

Common Name (s)
Economic Importance and Threats

Habitat:  Pelagic
Trophic Level:  Producer
Predator:  Marine microorganisms and animal larvae


• Tamil Nadu, Off Tuticorin (Lat: 8.71) (Long: 78.2) INDIA (Record: 1987-1989)

Literature Source(s)
  • Subramanian, SK and Krishnamurthi, MS (1997) Studies on the species composition of neritic diatoms in the aquatic realm off Tuticorin Coast in the Gulf of Mannar-Bay of Bengal Seaweed Research and Utilisation Seaweed Research and Utilisation Association 19(1-2) 1-11 Available at - NIO, Goa
  • Society for the Management of European Biodiversity Data (2009) World Register of Marine Species (WoRMS) Available at -
  • (2006) Algaebase Available at -
  • Plankton*Net Data Provider at the Alfred Wegener Insitute for Polar and Marine Research Available at -

Page last updated on:2010-09-08

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