Hydrosera
Wallich 1858 Category: Centric
TYPE SPECIES: Hydrosera triquetra Wallich
CLASS: Coscinodiscophyceae
ORDER: Biddulphiales
FAMILY: Biddulphiaceae
- Valve margin appearing doubly triangular
- Porefields three, with ocelli present, positioned on the ends of one of the "triangles"
Hydrosera is a large multipolar, centric diatom. Frustules are heavily silicified. Valve margins appear to be in the shape of two superimposed triangles. Porefields, containing ocelli, are positioned at the three poles of one of the apparent triangles. Frustules form large zig-zag colonies, joined by mucilage secreted from the porefields.
Hydrosera grows in streams of southern coastal areas and tropical islands. The colonies are benthic and anchored to the substrate by attachment of the terminal cell.
Cite This Page:
Spaulding, S., and Edlund, M. (2009). Hydrosera. In Diatoms of the United States. Retrieved May 19, 2013, from http://westerndiatoms.colorado.edu/taxa/genus/Hydrosera
Contributor: Sarah Spaulding | Mark Edlund - January 2009
Reviewer: Sam Rushforth
Citations
Julius, M.L. (2007). Why sweat the small stuff: the importance of microalgae in Hawaiian stream ecosystems. Biology of Hawaiian Streams and Estuaries, N.L. Evenhuis and J.M. Fitzsimons, eds. Bishop Museum Bulletin in Cultural and Environmental Studies 3: 183-193.
Qi, Y.Z., Reimer, C.W. and Mahoney, R.K. (1984). Taxonomic studies of the genus Hydrosera. I. Comparative morphology of H. triquetra Wallich and H. whampoensis (Schwartz) Deby, with ecological remarks. Proceedings of the 7th Diatom Symposium, 213-224.
Stoermer, E.F. and Julius, M.L. (2003). Centric Diatoms. In: Freshwater Algae of North America (J.D. Wehr and R.G. Sheath, eds) Elsevier Science pp. 559-594.