Gomphoneis
Cleve 1894 Category: Asymmetrical biraphid
TYPE SPECIES: Gomphoneis elegans Cleve
Image Credit: Marina Potapova and Sarah Spaulding
CLASS: Bacillariophyceae
ORDER: Cymbellales
FAMILY: Gomphonemataceae
- Valves clavate, symmetric to the apical axis
- Pseudoseptae present
- Longitudinal lines may be present
- Striae multiseriate
Gomphoneis valves are clavate in both valve and girdle view. Valves are symmetrical to the apical axis. Two distinct groups are currently included within the genus Gomphoneis. One group contains species (including G. herculeana and G. eriense) with multiseriate striae crossed by longitudinal lines and with stigmata. The longitudinal lines are formed by either marginal lamellae or an axial plate, both internal structures that cover the internal expression of the striae. The second group contains species (including G. olivacea and G. quadripunctata) that possess multiseriate striae, but the areolae are indistinct in under the light microscope. This group lacks longitudinal lines and has a variable number of stigmata, from 0-4. Both groups possess septae and pseudoseptae. The foot pole contains an apical pore field, bisected by the terminal raphe ends.
Cells form mucilaginous stalks, joined together into large colonies. In the United States, Gomphoneis is especially diverse in lakes and rivers of midwestern and western states.
Cite This Page:
Spaulding, S., and Edlund, M. (2009). Gomphoneis. In Diatoms of the United States. Retrieved May 21, 2013, from http://westerndiatoms.colorado.edu/taxa/genus/Gomphoneis
Contributor: Sarah Spaulding | Mark Edlund - January 2009
Reviewer: Sam Rushforth
Citations
Kociolek, J.P. and Rosen, B.H. (1984). Observations on North American Gomphoneis (Bacillariophyceae) I. Valve ultrastructure of G. mammilla with comment on the taxonomic status of the genus. Journal of Phycology 20: 361-368.
Kociolek, J.P. and Stoermer, E.F. (1986). Observations on North American Gomphoneis (Bacillariophyceae). II. Descriptions and ultrastructure of two new species. Transactions of the American Microscopical Society 105: 141-151 . http://www.jstor.org/stable/3226386
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
Kociolek, J.P. and Stoermer, E.F. (1988). Taxonomy, ultrastructure and distribution of Gomphoneis herculeana, G. eriense and closely related species (Naviculales: Gomphonemataceae). Proc. Acad. Nat. Sci. Phil. 140: 24-97. http://www.jstor.org/stable/4064935
Kociolek, J.P. and Stoermer, E.F. (1989). Phylogenetic relationships and evolutionary history of the diatom genus Gomphoneis. Phycologia 28(4): 438-454.
Kociolek, J.P. and Stoermer, E.F. (1991). Taxonomy and ultrastructure of some Gomphonema and Gomphoneis taxa from the Upper Laurentian Great Lakes. Canadian Journal of Botany 69: 1557-1576. 10.1139/b91-200
Kociolek, J.P. and Stoermer, E.F. (1993). Freshwater gomphonemoid diatom phylogeny: preliminary results. Hydrobiologia 269-270: 31-38. 10.1007/BF00028001
Thomas, E.W., Kociolek, J.P., Lowe, R.L. and Johansen, J.R. (2009). Taxonomy, ultrastructure and distribution of Gomphonemoid diatoms (Bacillariophyceae) from Great Smoky Mountains National Park (U.S.A.). Nova Hedwigia, Beiheft 135: 201-237.
Tuji, A. (2005). Taxonomy of the Gomphoneis tetrastigmata species complex. Bull. Natn. Sci. Mus., Tokyo, Ser. B, 31(3): 89-108.