Diplophrys parva  Anderson and Cavalier-Smith, 2012

Diagnosis: Cells ellipsoid, or ovate to round, enclosed by thin envelope of overlapping scales; sometimes rounded to broadly oval, but typically elongated oval with rounded ends, one to several intracytoplasmic refractive granules and smaller round hyaline vacuoles near cell periphery. Pseudopodia emanate from cell surface, appearing initially as an electron-dense conical protrusion (sagenetosome or bothrosome), eventually elongating and penetrating through the extracellular envelope of scales, either at one pole of the cell or two (two apparently always in Diplophrys archeri). Tubulocristate mitochondria; prominent Golgi with numerous (10 or more) stacked saccules located at the periphery of the cytoplasm. No cysts observed.

Dimensions: L = 6.5 µm (± 0.08 µm), W = 5.5 µm (± 0.06 µm); rounded ends 1.0 X 0.5 – 0.7 µm; refractive granules:  1-2 µm)

Habitat: the type source was the intestinal tract of a freshwater fish (Carassius auratus) isolated by S. A. Schaffer in 1992, Baltimore, MD.

Remarks: D. archeri is about twice as large and A. marina has more obvious, more densely branched filopodial tufts.