Type host: Hyla arborea (L., 1758), European treefrog.

Other hosts: None reported to date.

Type locality: CAUCASIA.

Geographic distribution: CAUCASIA.

Description of oocyst: Oocyst shape: spheroidal; number of walls: 1 (line drawing); wall thickness: unknown; wall characteristics: not given; L x W: 12; L/W ratio: 1.0; M: absent; OR: absent; PG: absent. Distinctive features of oocyst: none.

Description of sporocysts and sporozoite: Sporocyst shape: spheroidal; L x W: 4 x 4; L/W ratio: 1.0; SB: absent; SSB: absent; PSB: absent; SR: absent; SZ: unknown. (Most information comes from the line drawing). Distinctive features of sporocysts: none.

Prevalence: Unknown.

Sporulation: Unknown.

Prepatent and patent periods: Unknown.

Site of infection: Unknown.

Endogenous development: Unknown.

Materials deposited: None.

Remarks: This is the only Eimeria species described from a treefrog of the genus Hyla. Because most amphibian eimerians do not cross generic boundaries we feel that Yakimoff’s species is valid, but poorly described.