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Difflugia giganteacuminata
Difflugia giganteacuminata, 419  and 468 µm

 
Difflugia giganteacuminata (Chardez, 1958) Chardez et Gaspar, 1984

Diagnosis: Shell nearly cylindrical, always longer than 350 µm and with a large and long spine, which is at least 1/4 of the shell length.

Dimensions: Chardez & Gaspar (1984): 360-550 µm, spine 87-100 µm. My measurements: 419-468 µm.

Ecology: Sediment of ditches, between waterplants.

Remarks: I don’t know if this is a true species or only one of the many variations observed. Further observations are needed to make this clear. Just look at the three rows of shells below. They come from three different localities. The second one in the first row could be identified as D. giganteacuminata, if it was found without the other shells. It measures 429 µm. The same is true for shells in the other rows.

Difflugia acuminata - giganteacuminata
Five shells from the same sample, from Lemmer (Netherlands), measuring 243 to 429 µm
Five shells from the same sample, from Crailoo (Netherlands), measuring 270 to 415 µm
 
Shells from the same sample, from Ankeveen (Netherlands), measuring 229 to 429 µm

 
     

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