Type host: Hyperolius viridiflavus (Dumeril & Bibron, 1841), Common reed frog.

Other hosts: None reported to date.

Type locality: AFRICA: Kenya, Wamba (Rift Valley province, 00º 56' 584" N, 37º 20' 56.9" E).

Geographic distribution: AFRICA: Kenya.

Description of oocyst: Oocyst shape: ellipsoidal to ovoidal; number of walls: 2; wall thickness: outer 0.5-0.7, inner 0.1-0.2; wall characteristics: outer smooth; L x W: 17 x 13 (15-18 x 11-14); L/W ratio: 1.4 (1.2-1.6); M: absent; OR: absent; PG: absent. Distinctive features of oocyst: wall tightly encloses the sporocysts such that they sometimes appear deformed.

Description of sporocysts and sporozoite: Sporocyst shape: navicular (slightly pointed at both ends); L x W: 8.7 x 6.0 8-10 x 5.5-7); L/W ratio: 1.4 (1.2-1.6); SB: present, but barely visible as a slight thickening at one end of sporocyst; SSB: absent; PSB: absent; SR: present; SR characteristics: composed of coarse granules of irregular shape, each 1.5-2 wide, and these completely fill the sporocyst leaving only small parts of SZ visible; SZ: arranged head to tail, each with 1 spheroidal N visible, 1.5 wide, and in center of SZ. Distinctive features of sporocysts: thins, single-layered wall and navicular shape.

Prevalence: 1 of 2 (50%) frogs from Wamba; 0 of 40 frogs from Kakamega forest.

Sporulation: Exogenous.

Prepatent and patent periods: Unknown.

Site of infection: Intranuclear in epithelial cells of both small and large intestines.

Endogenous development: All endogenous stages are surrounded by a PV and develop in the N of epithelial cells of the small and large intestine. Early trophozoites were 3.5 x 2–3, located within a vacuole insde the host cell N. Mature microgamonts were spheroidal to ellipsoidal, ~10–15 x 8–10. Microgamonts in various stages of development were 11–16 x 7–12 and contained a large N and numerous eosinophilic granules resembling wall-forming bodies. No meronts were observed.

Materials deposited: Photosyntypes of sporulated oocysts and histological sections with (undescribed) endogenous stages deposited in the Department of Parasitology, University of Veterinary and Pharmaceutical Sciences Brno, Czech Republic (R 65/04). Symbiotype host (sensu Frey et al. 1992) in the herpetology collection of the National Museum of Kenya, Nairobi (A/4130).

Remarks: This is the first emerian described from this host genus. Its oocysts differ in both quantitative and qualitative features from all other known anuran eimeriids. Further, the geographic origin and host phylogeny make the conspecificity with other Eimeria spp. unlikely.