Spaulding, S.
(2011).
Halamphora.
In Diatoms of North America.
Retrieved December 02, 2024, from https://diatoms.org/genera/halamphora
Asymmetric Biraphid
Halamphora
Raphe eccentric, positioned along ventral margin
Dorsal margin of valve deeper than ventral margin
Raphe ledge present on dorsal side of raphe
Dorsal fascia usually absent
Valves are moderate, to strongly, asymmetric to the apical axis. Valves are symmetric to the transapical axis. The valve mantle is deep on the dorsal margin and shallow on the ventral margin. Most species of Halamphora lack a distinct marginal ridge; instead, the interface of the face and margin is gradual. A 'raphe ledge' may be present...