Delicata
Krammer 2003 Category: Asymmetrical biraphid
TYPE SPECIES: Cymbella delicatula Krammer
CLASS: Bacillariophyceae
ORDER: Cymbellales
FAMILY: Cymbellaceae
- Valves narrow, slightly asymmetrical to apical axis
- Valves symmetrical to the transapical axis
- Terminal raphe fissures deflected dorsally
- Stigmata and apical pore fields absent
Delicata valves are slightly asymmetrical to the apical axis and symmetrical to the transpical axis. The valve shape is narrow and lanceolate. The raphe is distinctly lateral and becomes reverse-lateral at the proximal ends. The terminus of the raphe is thin, comma shaped, and terminal raphe fissures are deflected toward the dorsal side. Valves lack a distinct central area. Stigmata are absent. The striae are fine and usually number more than 18 in 10 µm.
Delicata was recently segregated from Cymbella sensu lato.
Cite This Page:
Spaulding, S., and Edlund, M. (2009). Delicata. In Diatoms of the United States. Retrieved May 23, 2013, from http://westerndiatoms.colorado.edu/taxa/genus/Delicata
Contributor: Sarah Spaulding | Mark Edlund - January 2009
Reviewer: Sam Rushforth
Citations
Kociolek, J.P. and Stoermer, E.F. (1988). A preliminary investigation of the phylogenetic relationships among the freshwater, apical porefield-bearing cymbelloid and gomphonemoid diatoms (Bacillariophyceae). Journal of Phycology 24: 377-385. 10.1111/j.1529-8817.1988.tb04480.x
Krammer, K. (2002). The genus Cymbella. Diatoms of Europe. Diatoms of the European Inland Waters and Comparable Habitats 3: 1-584.
Krammer, K. (2003). Cymbopleura, Delicata, Navicymbula, Gomphocymbellopsis, Afrocymbella. Diatoms of Europe. Diatoms of the European Inland Waters and Comparable Habitats 4: 1-530.
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.