Diagnosis_Genus: Euduboscquella Coats & Bachvaroff 2012. Euduboscquellidae with trophont episome as disc-shaped shield bordered by a perinematic ring. Lamina pharyngea extending from perinematic ring into trophont cytoplasm. Food vacuole formed as trophont emerges from host giving rise to extracellular tomont. Multiple spore morphotypes possible, including dinokont and non-dinokont cells. Individual infections producing only one type of spore.
Diagnosis_Species: Euduboscquella cachoni Coats 1988. Trophonts spherical to ovoid, 3.4 – 47.1 x 3.4 – 12.8 µm; perinema forms a closed elliptical ring measuring 5.0 – 33.9 µm along the major axis; lamina pharyngea broadly funnel-shaped, ~2 µm in maximum diameter; shield convex, often inconspicuous, and creased by a short sagittal furrow; nucleus spherical to ovoid, 2.2 – 15.7 µm in maximum dimension; eccentric nucleolus of immature trophonts either fragmented or absent in mature trophonts; chromosomes not condensed during trophont growth. Post-phagotrophic stage cylindrical, 33.7 – 95.0 x 12.1 – 20.2 µm (70.8 ± 2.66 x 14.5 ± 0.29 µm). Macrospores bipartite, 5.4 – 7.9 x 3.9 – 4.9 µm (6.6 ± 0.10 x 4.4 ± 0.05 µm); transverse flagellum ~10 µm long; posterior flagellum ~15 µm long; nucleus ovoid, ~2 x 3 µm. Microspores spherical, 1.6 – 3.1 µm (2.2 ± 0.08 µm) in diameter; single flagellum ~5 µm long; nucleus ovoid, ~1 x 2 µm. Cyst-like spores spindle-shaped, 4.3 – 7.6 x 1.0 – 1.8 µm (6.0 ± 0.20 x 1.4 ± 0.05 µm).

Body_trophont_length: 3.4 – 47.1 µm
Body_trophont_wide: 3.4 – 12.8 µm
Body_macrospores_length: 5.4 – 7.9 µm
Body_macrospores_wide: 3.9 – 4.9 µm
Body_microspores_length: 1.6 – 3.1 µm