Potapova, M.,
Spaulding, S.,
Edlund, M.
(2008).
Eucocconeis.
In Diatoms of North America.
Retrieved May 01, 2026, from https://diatoms.org/genera/eucocconeis?x-craft-preview=409442409a997390693ff24c7010fd6f1c96fb56f8f091fa016a63de9a54aaccecpiqubknd
Monoraphid
Eucocconeis
Frustules heterovalvar - one valve with a raphe, the other lacking a raphe
Frustules with torsional twist about the apical axis
Valves linear-elliptic to lanceolate
Striae uniseriate
Terminal raphe fissures long, curved to opposite sides
Eucconeis frustules are bent about the median transapical plane, including a twisted, sigmoid central sternum. As a member of the monoraphid group, the frustules are heterovalvar and differ in ornamentation between the raphe valve and rapheless valve.
Eucocconeis species occur commonly in the littoral zone of oligotrophic lakes, within...