Cymbella

Belongs within: Bacillariophycidae.

Cymbella is a genus of diatoms with more or less asymmetrical valves (Crosby & Ferguson Wood 1959).

Characters (Crosby & Ferguson Wood 1959): Frustules free, stipitate or in gelatinous tubes; valves more or less asymmetrical along longitudinal axis, linear, elliptic, cymbiform or arcuate; median line excentric, straight or curved; striae usually radiate and more or less distinctly punctate; chromatophore single.

<==Cymbella Agardh 1830W61b
    |--C. aequalisG64
    |--C. affinis Kütz. 1844CFW59
    |--C. arcusG64
    |--C. aspera (Ehr.) Cl. 1894 [=Cocconema asperum Ehr. 1840]CFW59
    |--C. cesatii (Rab.) Grun. in A.S. 1881 [=Navicula cesatii Rab. 1853]W61a
    |--C. cistula (Hempr.) vH. 1885 [=Cocconema cistula Hempr. in Ehrenberg 1838]W61a
    |    |--C. c. var. cistulaW61a
    |    `--C. c. var. maculata (Kützing) A.S. 1875 [=C. maculata Kützing 1844]W61a
    |--C. cuspidataSG05
    |--C. cymbiformisSG05
    |--C. dianaeG64
    |--C. ehrenbergii Kützing 1844W61a
    |--C. gracilisG64
    |--C. helveticaG64
    |--C. heteropleura (Ehrenberg) Kützing 1844 [=Pinnularia heteropleura Ehrenberg 1843]W61a
    |--C. lanceolata (Ehrenberg) Brun. 1880 [=Cocconema lanceolatum Ehrenberg 1838]W61a
    |--C. leptoceras (Ehr.) Kütz. 1844CFW59
    |--C. lunataG64
    |--C. microcephalaG63
    |--C. minutaTJ06
    |--C. naviculiformisCFW59
    |--C. oahuensis Hustedt 1942G63
    |--C. obtusaG64
    |--C. parva (Smith) Cleve 1894 [=Cocconema parva Smith 1853]W61a
    |    |--C. p. var. parvaW61a
    |    `--C. p. var. hungarica [=C. hungarica Grun. in A.S. 1875]W61a
    |--C. pisciculusG64
    |--C. pusillaTJ06
    |--C. radiosaG63
    |--C. scoticaG64
    |--C. sinuata Greg. 1856CFW59
    |--C. subturgida Hust. in A.S. 1934CFW59
    |--C. truncataG64
    |--C. tumidaSG05
    |--C. turgidaSG05
    |--C. ventricosa [incl. Cy. lunula, Cocconema lunulum]CFW59
    `--C. yarrensis (A.S.) Cleve 1894 [=Encyonema yarrense A.S. 1886]W61b

*Type species of generic name indicated

References

[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.

[G63] Giffen, M. H. 1963. Contributions to the diatom flora of South Africa. I. Diatoms of the estuaries of the eastern Cape Province. Hydrobiologia 21: 201–265.

[G64] Gray, J. E. 1864. Handbook of British Water-weeds or Algae. R. Hardwicke: London.

[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.

[TJ06] Taukulis, F. E., & J. John. 2006. Diatoms as ecological indicators in lakes and streams of varying salinity from the wheatbelt region of Western Australia. Journal of the Royal Society of Western Australia 89 (1): 17–25.

[W61a] Wood, E. J. F. 1961a. 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.

[W61b] Wood, E. J. F. 1961b. Studies on Australian and New Zealand diatoms. V.—The Rawson Collection of recent diatoms. Transactions of the Royal Society of New Zealand 88 (4): 699–712.