Cavinula maculata

Potapova, Cvetkoska, Hamilton and Levkov in Cvetkoska et al. 2014      Category: Symmetrical biraphid

Cavinula davisiae


Cavinula pseudoscutiformis

LM scalebar = 10 µm = 40 pixels.


Contributor: Marina Potapova - December 2014
Length Range: 25-41 µm
Width Range: 15-20 µm
Striae in 10 µm: 20-25


Valves are elliptic-lanceolate with rounded apices. The valve face is flat, and at the margin, sharply bent onto the mantle. Striae are radiate throughout; a few shortened striae may be present around the central area. Striae are uniseriate and composed of fine, rounded to elliptic areolae. Internally, interstriae are slightly elevated and the areolae are covered with hymenes. The axial area is narrow and linear. The central area is large and circular or transversely elliptic. The central nodule is distinctly thickened on the internal side of the valve. The raphe is linear. Externally, the proximal and the distal raphe ends are pinhole-shaped. The distal raphe ends do not extend onto the valve mantle, that is, the raphe terminates on the valve face. Internally, the raphe is positioned on elevated sternum. Distal raphe fissures terminate with a helictoglossa. Copulae are open, with one row of pores.

Original Description

Author: Potapova et al. 2014
Length Range: 25-41 µm
Width Range: 15-20 µm
Striae in 10 µm: 20-25

Original Description

Original Images

Cite This Page:
Potapova, M. (2014). Cavinula maculata. In Diatoms of the United States. Retrieved April 21, 2018, from

Species: Cavinula maculata

Contributor: Marina Potapova

Reviewer: Sarah Spaulding


Cvetkoska, A., Levkov, Z., Hamilton, P.B. and Potapova, M. (2014). The biogeographic distribution of Cavinula (Bacillariophyceae) in North America with the descriptions of two new species. Phytotaxa 184: 181–207.

Links & ID's

Index Nominum Algarum (INA)

California Academy of Sciences (CAS)

North American Diatom Ecological Database (NADED)


Autecology Discussion

So far, Cavinula maculata has been found in a few creeks in South Carolina and Delaware. These creeks have slightly acidic, low condictivity and low-nutrient water.