Meridion circulare
var.
constrictum
(Ralfs) V. H. 1881
Length:
21
Width:
7
Costae:
7
Striae:
Collection
1428a
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Authority information
(Ralfs) V. H., Syn. Diat. Belgique, pl. 51, figs. 14, 15. 1881 (
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
)
Meridion constrictum
Ralfs, Ann. Mag. Nat. Hist., 12:458, pl. 18, fig. 2. 1843.
Ecology
Like the nominate variety, this taxon prefers flowing, fresh water and is tolerant to small amounts of salt (
Patrick and Reimer 1966
).
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
).