Difflugia venusta (Penard, 1902)
Diagnosis: shell outline smooth, pyriform, with an elongated neck, sharply pointed in the aboral region; shell composed of small to large pieces of flat quartz, plus occasional diatoms.
Dimensions: Penard gives no dimensions. My measurements c. 150 um.
Ecology: aquatic plants, debris.
Remarks: Penard describes this species as a characteristic variety of Difflugia pyriformis. His specimens always had zoochlorellae.