Rhopalodia gibberula (Ehr.)
Length: 28

 Width:9

Costae: 6

Striae:































Collection 1159

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(Ehr.) O. Mull (Stoermer and Yang 1969)

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This image was taken utilizing DIC for the specimen above.


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This taxon has as leanceolate to linear-elliptic grustule in girdle view. The valve has a convex dorsal margin that is notched in the middle. The ventral margin is straight. The valve is bent as is the apices. The raphe is on the dorsal margin of thevalve. This taxon has radiate costae (Patrick and Reimer 1975).


  • Type Locality
    New England States, Middle Atlantic Statess, Southeastern States, Gulf Coast States, West Central States, South Central States, lakes States, Plains States, New Mexico, Montana and California (Patrick and Reimer 1975).
  • Synonyms
    Eunotia gibberula Ehrenberg, Phys. Abh. Akad. Wiss. Berlin, 1841:126, pl. 3(4), fig. 8. 1843(Stoermer and Yang 1969).
    Epithemia gibberula (Ehr.) Kutz., Bacill., p. 35, pl. 29, fig. 54; pl. 30, fig. 3. 1844 (Patrick and Reimer 1975).
    Cystopleura gibberula (Ehr.) Kuntze, Revisio Gen. Plant., vol. 2, p. 891. 1891 (Patrick and Reimer 1975).
  • Ecology
    This taxon is highly tolerant. It prefers water that contains chloride and can also be found in water that is slightly conductive (Patrick and Reimer 1975).

    Size ranges and morphology

  • Length is 40 to 70 micrometers (Patrick and Reimer 1975).
  • Width of frustule is 20 to 40 micrometers (Patrick and Reimer 1966).
  • Width of valve is 7 to 14 micrometers (Patrick and Reimer 1966).
  • Costae are 3 to 4 in 10 micrometers (Patrick and Reimer 1975).
  • Alveoli are 12 to 17 in 10 micrometers (Patrick and Reimer 1975).