Belongs within: Fragilariaceae.
Fragilaria is a genus of laterally rectangular diatoms growing in band-like chains (Crosby & Ferguson-Wood 1959).
Characters (Crosby & Ferguson Wood 1959): Cells rectangular in girdle view, elliptical in valve view, in band-like chains. Valves flat, without raphe or septa, bilaterally symmetrical, with row of puncta running perpendicular to apical axis and narrow, clear field along apical axis of valve.
Fragilaria Lyngbye 1819W61
|--F. acutaG64
|--F. binodis [incl. Odontidium parasiticum]G64
|--F. brevistriataSG05
|--F. californicaM01
|--F. capucina Desm. 1825W61 [incl. F. diophthalmaCFW59, F. rhabdosoma var. setacea Ehrenberg 1869CFW59]
|--F. coccochromaM01
|--F. constricta Ehrenberg 1843CFW59 [incl. F. undataG64]
|--F. crotonensis Kitton 1869W61
|--F. cylindrusB26
|--F. harrisonii (Smith) Grun. 1862W61 [=Odontidium harrisonii Smith 1856W61, Dimeregramma harrisoniiG64]
| |--F. h. var. harrisoniiG64
| `--‘Dimeregramma’ h. var. tenellumG64
|--F. hyalinaM01
|--F. neoproductaVVZ11
|--F. oceanica Cleve 1873CFW59
|--F. pinnata Ehrenberg 1843W61 [=Opephora pinnataCFW59]
|--F. spicula Mereschkowsky 1901M01
|--F. striatula Lyngbye 1819CFW59
|--F. sublinearisPHK96
`--F. virescens Ralfs 1843W61
*Type species of generic name indicated
References
[B26] Bigelow, H. B. 1926. Plankton of the offshore waters of the Gulf of Maine. Bulletin of the Bureau of Fisheries 40 (2): 1–509.
[CFW59] Crosby, L. H., & E. J. Ferguson Wood. 1959. Studies on Australian and New Zealand diatoms. II.—Normally epontic and benthic genera. Transactions of the Royal Society of New Zealand 86 (1): 1–58, pls 1–9.
[G64] Gray, J. E. 1864. Handbook of British Water-weeds or Algae. R. Hardwicke: London.
[M01] Mereschkowsky, C. 1901. A list of Californian diatoms (concluded). Annals and Magazine of Natural History, series 7, 7: 505–520, pls 4–5.
[PHK96] Prescott, L. M., J. P. Harley & D. A. Klein. 1996. Microbiology 3rd ed. Wm. C. Brown Publishers: Dubuque (Iowa).
[SG05] Sau, A., & R. K. Gupta. 2005. Algal flora of Indian Botanic Garden, Howrah, West Bengal. Bulletin of the Botanical Survey of India 47: 63–86.
[VVZ11] Van de Vijver, B., R. Zidarova, M. Sterken, E. Verleyen, M. de Haan, W. Vyverman, F. Hinz & K. Sabbe. 2011. Revision of the genus Navicula s.s. (Bacillariophyceae) in inland waters of the sub-Antarctic and Antarctic with the description of five new species. Phycologia 50 (3): 281–297.
[W61] Wood, E. J. F. 1961. Studies on Australian and New Zealand diatoms. IV.—Descriptions of further sedentary species. Transactions of the Royal Society of New Zealand 88 (4): 669–698.