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.

Species from Villefranche-sur-Mer (France) Euduboscquella parasite infecting Favella markusovszkyi
Undescribed species of Euduboscquella, infecting Favella markusovszkyi. Known from SSU and ITS sequence from 3 individual infected host cells (Bachvaroff et al. 2012). Accession number: JN934985
This species is very closed to individuals infecting Favella panamensis described as Euduboscquella sp. found in Masan Bay, Korea (Bachvaroff et al. 2012, Accession number: JN934986) and individuals sequenced by Harada et al. 2007 (Accession number: AB295040). Between these two parasites, there were only seven SSU differences (JN934985 versus JN934986), but there was a large 34-base extension of stem IV in the ITS2 from F. ehrenbergii in the Masan Bay parasite, and there were four compensatory changes in stems I to III among the Euduboscquella isolates from these two sites and hosts. The similarity between Favella markusovszkyi and Favella panamensis hosts was mirrored by their parasites and might represent an example of host parasite coevolution.