Spaulding, S.,
Edlund, M.
(2008).
Rhoicosphenia.
In Diatoms of North America.
Retrieved October 15, 2024, from https://diatoms.org/genera/rhoicosphenia
Asymmetric Biraphid
Rhoicosphenia
One valve with complete raphe
One valve with small raphe branch (rudimentary raphe)
Pseudosepta at both poles
Frustule curved in girdle view
Frustules of Rhoicosphenia are clavate in valve view and heterovalvar. In girdle view, valves are flexed, and curved. As a result of the asymmetry to the transverse axis, the valve face is curved. One valve has a complete raphe with two distinct raphe branches. The other valve has a very small raphe branch on the footpole. Pseudosepta...