Karayevia
Round et Bukhtiyarova ex Round 1998 Category: Monoraphid
TYPE SPECIES: Achnanthes clevei Grunow in Cleve et Grunow
Image Credit: Marina Potapova
CLASS: Bacillariophycideae
ORDER: Achnanthales
FAMILY: Achnanthidiaceae
- Rapheless valve with nearly parallel striae
- Raphe valve with radial striae
- External distal raphe fissures curved to one side
- Internal expression of areolae occluded
The valves of Karayevia are elliptic to lanceolate with rostrate to capitate ends. The rapheless valve possesses striae that are nearly parallel, composed of circular areolae. The raphe valve possesses radial striae, composed of transapically elongate areolae. Externally, the distal raphe fissures curve to the same side. Internally, the areolae are occulded. Cells grow attached to sand grains, with many species preferring alkaline waters. This genus contains species related to Achnanthes clevei Grunow in Cleve et Grunow.
The original description of the genus, as Kolbesia, was invalid because the type was not designated (Fourtanier and Kociolek 1999) Round (1998) later validily published the genus. The type of Kolbesia and its members have been transfered to Karayevia.
Cite This Page:
Spaulding, S., and Edlund, M. (2008). Karayevia. In Diatoms of the United States. Retrieved June 19, 2013, from http://westerndiatoms.colorado.edu/taxa/genus/Karayevia
Contributor: Sarah Spaulding | Mark Edlund - December 2008
Citations
Bukhtiyarova, L.N. (2006). Additional data on the diatom genus Karayevia and a proposal to reject the genus Kolbesia. Nova Hedwigia Beiheft 130: 85-96.
Kingston, J.C. (2003). Araphid and Monoraphid Diatoms. In: Freshwater Algae of North America. Ecology and Classification (J.D. Wehr and R.G. Sheath, eds). Elsevier Science pp. 595-636.
Kreis, R.G.,Jr. and Stoermer, E.F. (1979). Diatoms of the Laurentian Great Lakes III. Rare and poorly known species of Achnanthes Bory and Cocconeis Ehr. (Bacillariophyta). J. of Great Lakes Research 5:276-291.
Lange-Bertalot, H. and Krammer, K. (1989). Achnanthes eine Monographie der Gattung mit Definition der Gattung Cocconeis and Nachtragen zu den Naviculaceae. Bibliotheca Diatomologica 18, 393 pp. Cramer, Berlin, Stuttgart.
Round, F.E. (1998). Validation of some previously published Achnanthoid genera. Diatom Research 13: 181.
Round, F. E. and Bukhtiyarova, L. (1996). Four new genera based on Achnanthes (Achnanthidium) together with a re-definition of Achnanthidium. Diatom Research 11: 345-361.
Sherwood, A.R., Rintoul, T.L., Muller, K.M. and Sheath, R.G. (2000). Seasonality and distribution of epilithic diatoms, macroalgae and macrophytes in a spring-fed stream system in Ontario, Canada. Hydrobiologia 435: 143-152.