Cosmioneis
Mann et Stickle in Round, Crawford and Mann 1990 Category: Symmetrical biraphid
TYPE SPECIES: Cosmioneis pusilla Mann & Stickle in Round, Crawford & Mann
Image Credit: Rex Lowe
CLASS: Bacillariophyceae
ORDER: Naviculales
FAMILY: Cosmionidaeae
- Striae uniseriate and radial
- Valve face flat, with broad valve mantle
- Central area elliptical
- Internal proximal raphe ends anchor-shaped
- External proximal raphe ends expanded
Valves of species in the genus Cosmioneis are lanceolate to elliptical in outline, with capitate to rostrate ends. The valve face is flat, and the valve mantles are relatively broad. Striae are uniseriate and radial, and are composed of round to oval areolae. Striae become irregular near the central area. The axial area is narrow and linear, except at the central area, where the central area is expanded and ellipitical. Externally, the proximal raphe ends are expanded. Internally, the proximal raphe ends are anchor-shaped. Internally, the areolae are covered by hymenes. Living cells possess two H-shaped plastids.
Cosmioneis is a small genus found in alkaline, aerophilic habitats of North America and includes the species C. pusilla (W. Smith) Mann and Stickle.
Cite This Page:
Spaulding, S., and Edlund, M. (2009). Cosmioneis. In Diatoms of the United States. Retrieved May 21, 2013, from http://westerndiatoms.colorado.edu/taxa/genus/Cosmioneis
Contributor: Sarah Spaulding | Mark Edlund - January 2009
Reviewer: Sam Rushforth
Citations
Hemphill-Haley, E. (1996). Diatoms as an aid in identifying late-Holocene tsunami deposits. The Holocene 6: 439-448.
Lowe, R.L. and Sherwood, A.R. (2010). Three new species of Cosmioneis (Bacillariophyceae) from Hawai'i. Proceedings of the Academy of Natural Sciences of Philadelphia 160(1):21-28. 10.1635/053.160.0104
Lowe, R.L., Furey, P.C., Ress, J.A. and Johansen, J.R. (2007). Diatom biodiversity and distribution on wetwalls in Great Smoky Mountains National Park. Southeast Naturalist 6: 135-152.
Patrick, R.M. and Reimer, C.W. (1966). The Diatoms of the United States exclusive of Alaska and Hawaii, V. 1. Monographs of the Academy of Natural Sciences of Philadelphia 13.
Van de Vijver, B. and Gremmen, N. (2006). Three new moss-inhabiting diatom species from sub-Antarctic Marion Island. Diatom Research 21: 427-439.
Van de Vijver, B. Frenot, Y. and Beyens, L. (2002). Freshwater diatoms from Ile de la Possession (Crozet Archipelago, Subantarctica). Bibliotheca Diatomologica 46: 1-412.