Epithemia intermedia Fricke

Length: 51

Width: 16

Striae: 12

Costae: 2-4

Collection 1157a

More information

This is a scanned in image from a previous
picture of the specimen. The slide was missing
so no new pictures could be taken.

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Authority information

Epithemia intermedia Frickein A.S., Atlas Diat., pl.249, fics. 14-18. 1904. (Patrick and Reimer 1975).

More information

Almost stiaight valve with ventral margin, slightly concave in the middle. Main body of the valve and apices not clearly differentiated. Raphe only slightly curved up on the ventral margin at the central nodule towards dorsal margin. Sometimes raphe is only visible in the valve view of the central portion. Closely related to E. adnata but E. intermedia usually has more distant costae, fewer rows of alveoli in ten micrometers, and the rows of alveoli and costae are parallel to each other. Costae ends in girdle view capitate. (Patrick and Reimer 1975).

Type Locality

USA, Iowa (Patrick and Reimer 1975).


    Epithemia zebra var. Intermedia (Fricke 1904 in Schmidt et al. 1874 - ) Hustedt 1934, p. 394 (VanLandingham 1969).

Ecological distribution

Found in lakes, ponds, rivers, springs/streams, pools, and oozing areas. Acidophilous, indifferent, alkaliphilous, alkalibiontic. Oligohalobous. (Beaver 1981).

Size ranges and morphology

  • Length is 20 to 55 micrometers (Patrick and Reimer 1975).
  • Width is 9 to 15 micrometers (Patrick and Reimer 1975).
  • Costae are about 3 to 4 in 10 micrometers (Patrick and Reimer 1975).
  • Alveoli rows are 10 to 12 in 10 micrometers (Patrick and Reimer 1975).