Difflugia lanceolata Penard, 1890
Diagnosis: Shell elongate and tapering at both ends, composed of siliceous angular particles arranged so that the sides appear polished and smooth; aperture circular and surrounded by an organic collar.
Dimensions: Length 116-260 µm; breadth of shell 46-72 µm. My measurements 138-200 µm.
Remarks: The shell may sometimes be more sharply pointed in the aboral region, but the clean outline of this species is the main distinguishing feature.
Probably a test of this species has been described and depicted by Ehrenberg (1832) as D. oblonga!