Chaetoceros didymus   Ehrenberg,  1845 (Diatom)
Organism information awaits expert curation
Taxonomy
Kingdom:Chromista
Phylum:Ochrophyta
Class: Bacillariophyceae
Order:Chaetocerotanae incertae sedis
Family:Chaetocerotaceae

Image copyrights: Mona Hoppenrath

Description
Color: Yellow brown.

Colonies are straight, usually long. Cells are rectangular in girdle view with raised corners. Valves have a protuberance in the center. The mantle is low. Foramina are panduriform, wide or narrow, with central constriction. Intercalary and terminal setae similar: long, coarse, straight, with short basal part. Intercalary setae diverge at about 25-45 degrees to the colony axis, terminal setae are almost parallel to the colony axis. Setae cross over at the colony margin. Two chloroplasts are present per cell. In SEM valve are elliptical and perforated with small poroids. Long branched capilli are located at the edge of the valve and at the setae base. The rimoportula is a centrally located, externally tube-like structure surrounded by small spines. Setae are four-sided in cross section, perforated with poroids, bearing spines. Resting spores are smooth, paired, held together by short thick curved setae. Primary valves with one or two undulations or with central high protuberance, secondary valves concave.

Reproduction is general for group: both sexual and asexual.


Synonym (s)
Chaetoceros didymum Ehrenb., 1845
(Spelling variation)

Common Name (s)
Economic Importance and Threats

Ecology
Habitat:  Pelagic, Estuarine, Coastal
Trophic Level:  Producer
Predator:  Marine microorganisms and animal larvae

Biogeography


• Tamil Nadu, Off Tuticorin (Lat: 8.71) (Long: 78.2) INDIA (Record: 1987-1989)
• Bay of Bengal INDIA (Record: 06/07/2001-02/08/2001)
• Kerala, Balathuruthu INDIA
• West Coast INDIA
• Palk Bay INDIA (Record: 05/1951-06/1953)
• Tamil Nadu, Gulf of Mannar INDIA (Record: 01/1950-06/1953)
• Orissa, Rushikulya Estuary (Lat: 19.37) (Long: 85.05) INDIA (Record: 11/01/1989-12/01/1989)
• East Coast (Lat: 10) (Long: 79) INDIA (Record: 01/1999-08/2002)
• East Coast (Lat: 21) (Long: 94) INDIA (Record: 01/1999-08/2002)

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 - http://www.marinespecies.org
  • Plankton*Net Data Provider at the Alfred Wegener Insitute for Polar and Marine Research Available at - http://dx.doi.org/10013/de.awi.planktonnet
  • Paul, JT; Ramaiah, N; Gauns, M and Fernandes, V (2007) Preponderance of a few diatom species among the highly diverse microphytoplankton assemblages in the Bay of Bengal. Marine Biology springerlink 152(1) 63-75 Available at - http://drs.nio.org/drs/bitstream/2264/637/4/Mar_Biol_152_63.pdf
  • Sanilkumar, M G; Dr.Joseph, K J; Dr. Saramma, A V (2009) Planktonic Microalgae Microalgae in the Southwest Coast of India 34-114 Available at - http://dyuthi.cusat.ac.in/xmlui/purl/1922
  • Subrahmanyan, R and Sarma, AHV (1960) Studies on the phytoplankton of the west coast of India Part III. Seasonal variation of the phytoplankters and environmental factors Indian Journal of Fisheries Indian Journal of fisheries for the Indian council of Agricultural research, Cochin, India 7 (2) 307-336 Available at - http://eprints.cmfri.org.in/1899/1/Article_04.pdf
  • Prasad, RR and Nair, PVR (1960) Observations on the distribution and occurrence of diatoms in the inshore waters of the Gulf of Mannar and Palk Bay Indian Journal of Fisheries Indian Council of Agricultural Research 7 (1) 49-68 Available at - http://eprints.cmfri.org.in/1890/1/Article_05.pdf
  • Gouda, R and Panigrahy, RC (1989) Diurnal variation of phytoplankton in Rushikulya estuary, east coast of India Indian Journal of Marine Sciences Scientific Publishers 18(4) 246-250 Available at - NIO, Goa
  • Madhav, GV and Kondalarao, B (2004) Distribution of phytoplankton in the coastal waters of east coast of India Indian Journal of Marine Sciences CSIR, New Delhi 33(3) 262-268 Available at - http://nopr.niscair.res.in/bitstream/123456789/1678/1/IJMS%2033%283%29%20262-268.pdf

Page last updated on:2012-03-09

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