Spaulding, S.,
Edlund, M.
(2008).
Cocconeis.
In Diatoms of North America.
Retrieved November 17, 2024, from https://diatoms.org/genera/cocconeis
Monoraphid
Cocconeis
Frustules heterovalvar - one valve with a raphe, the other lacking a raphe
Valves elliptic
Striae uniseriate in freshwater species
Terminal raphe fissures absent
Cocconeis is heterovalvar, that is, the raphe valve ornamentation differs from that of the rapheless valve. Ornamentation of the raphe valve may differ markedly from that of the rapheless valve. The valve mantle is narrow in relation to the valve face, so cells are rarely (if ever) seen in girdle view. Valves may be flexed, or arched,...