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Keratella testudo
Phylum Rotifera
Class Monogononta
Order Ploima
Family Brachionidae
Distinguishing Characteristics
  • Postero-lateral facets on the dorsal surface of the lorica usually open.
  • No pustules present on lorica surface.
  • The anterior horizontal ridge of anteromedial facet is about the same length as the other ridges of the facet giving a distinctly hexagonal shape.
  • Present in lakes from spring through fall.
Additional Notes
  • Can be confused with Keratella hiemalis.
  • Posterior spines can vary greatly in length.
  • If your specimen has a much reduced second posterior spine, please compare with Keratella valga.
Additional Pictures
Quicktime Movies