Navicula
Bory de Saint-Vincent 1822 Category: Symmetrical biraphid
TYPE SPECIES: Navicula tripunctata (O. Müller) Bory de Saint-Vincent
Image Credit: Pat Kociolek, Loren Bahls, Sarah Spaulding, Marina Potapova
CLASS: Bacillariophyceae
ORDER: Naviculales
FAMILY: Naviculaceae
- Striae composed of lineate areolae
- Sternum central, thickened
Valves of Navicula tend to be elliptical to broadly-lanceolate in outline. Valve ends may be capitate, acute, rounded, or not expanded. The central sternum is thickened, and that thickening may be somewhat asymmetric. Pseudosepta may be present, or absent. The raphe is straight and filiform, or lateral in some species. The proximal raphe ends are slightly deflected to one side. The central area may be expanded, but the silica is not thickened into a fascia.
In the strict sense, Navicula Bory contains species with lineate areolae. During the mid-1900's (primarily through the work of Hustedt), Navicula became a genus that contained a large number of unrelated lanceolate, biraphid species. Many of these unrelated species have recently been separated into new genera or replaced into the older, originally described genera.
Cite This Page:
Spaulding, S., and Edlund, M. (2009). Navicula. In Diatoms of the United States. Retrieved May 22, 2013, from http://westerndiatoms.colorado.edu/taxa/genus/Navicula
Contributor: Sarah Spaulding | Mark Edlund - January 2009
Reviewer: Sam Rushforth
Citations
Bahls, L.L. (2011). Three new species of Navicula (Bacillariophyta) from Oregon and Montana and a review of diatom endemism in the Northwest. Northwest Science 85 (4): 517-526.
Bahls, L.L. (2012). Seven new species in Navicula sensu stricto from the Northern Great Plains and Northern Rocky Mountains. Nova Hedwigia, Beiheft 141: 19–38.
Cox, E.J. (1978). Taxonomic studies on the diatom genus Navicula Bory. Navicula grevillei (C.A. Ag.) Heiberg and N. comoides (Dillwyn) H. & M. Peragallo. Bot. J. Linn. Soc. 76: 127-143.
Cox, E.J. (1979). Taxonomic studies on the diatom genus Navicula Bory: the typification of the genus. Bacillaria 2: 137-153.
Cox, E.J. (1995). Taxonomic studies on the diatom genus Navicula Bory VII. The identity and typification of Navicula gregaria Donkin, N. cryptocephala Kutz. and related taxa. Diatom Research 10: 91-111.
Cox, E.J. (1999). Studies on the diatom genus Navicula Bory. VIII. Variation in valve morphology in relation to the generic diagnosis based on Navicula tripunctata (O.F. Muller) Bory. Diatom Research 14: 207-237.
Lange-Bertalot, H. (2001). Navicula sensu stricto, 10 genera separated from Navicula sensu lato, Frustulia. Diatoms of Europe 2: 1-526.
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.
Potapova, M. (2013). The types of 22 Navicula (Bacillariophyta) species described by Ruth Patrick. Proceedings of the Academy of Natural Sciences of Philadelphia 162: 1-23.