Meridion circulare (Grev.) Ag. 1831
Length: 28

 Width: 5

 Costae: 5

 Striae:































Collection 1348a

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Authority information

(Grev.) Ag., Consp. Crit. Diat., pt. 3, p. 40. 1831 (Patrick and Reimer 1966).

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  • For the most part, this taxon is found in the periphyton. Occasionally, specimens from shoreline regions have been found in Lake Michigan (Stoemer and Yang 1969).

  • Synonyms (Patrick and Reimer 1966)
    Echinella circularis Grev., Mem. Wernerian Nat. Hist. Soc., 4:213, pl. 8, fig. 2. 1822.
    Meridion zinkenii Kuetz., Flora, 26:396. 1843.
    Meridion circulare var. zinkenii (Kuetz.) Grun., Verh. Zool.-Bot. Ges. Wien, 12:345. 1862.

  • Ecology
    This taxon prefers flowing, fresh water (Patrick and Reimer 1966) and a pH range of 6.4 to 9.0 with an optimum at approximately 8 (Lowe 1974).

    Size ranges and morphology

  • Length is 12 to 80 micrometers (Patrick and Reimer 1966).
  • Width is 4 to 8 micrometers (Patrick and Reimer 1966).
  • Costae are 3 to 5 in 10 micrometers (Patrick and Reimer 1966).
  • Striae are 15 to 16 per 10 micrometers between costae (Patrick and Reimer 1966).