Type host: Chiromantis petersii kelleri Boettger, 1893, Central foam-nest treefrog.

Other hosts: None reported to date.

Type locality: AFRICA: Kenya: Kula Mawe (Eastern Province, 00º 34' 11.1" N, 38º 11' 56.3" E).

Geographic distribution: AFRICA: Kenya.

Description of oocyst: Oocyst shape: ellipsoidal; number of walls: 1; wall thickness: ~0.5; wall characteristics: smooth; L x W: 18.5 x 15.2 (17-19 x 14.5-16); L/W ratio: 1.2 (1.1-1.3); M: absent; OR: absent PG: absent. Distinctive features of oocyst: thin, smooth wall that easily breaks down in hypertonic Sheather's sugar solution.

Description of sporocysts and sporozoite: Sporocyst shape: navicular (slightly pointed at both ends); L x W: 10.6 x 6.8 (9.5-12 x 6-7); L/W ratio: 1.6 (1.5-1.7); SB: present as slightly thickened end of sporocyst, barely visible; SSB: absent; PSB: absent; SR: present; SR characteristics: mass of fine retractile granules, each ~1 wide, so numerous they almost completely fill the sporocyst leaving only parts of SZ visible; SZ: elongate, 10 x 2, with finely granulated cytoplasm and each with 2 spheroidal RBs, 1-1.5, located at opposite ends of each SZ, N ~1.5 in center of SZ. Distinctive features of sporocysts: SR that completely packs sporocyst obscuring SZ, and the tendency of sporocysts to disintegrate during storage and release free SZ into oocyst.

Prevalence: 1 of 1 (100%).

Sporulation: Presumably exogenous; oocysts were stored in 2.5% K2Cr2O7 at room temperature for 4 wk and then at 6–7ºC for 3 mo before being examined, some of which were not sporulated.

Prepatent and patent periods: Unknown.

Site of infection: Intranuclear in epithelial cells of the small intestine.

Endogenous development: Early trophozoites, 3 x 2, were within a parasitophorous vacuole (PV), 5 x 3.5–4, inside a host cell N. Meronts, with ~5 merozoites, were 6–7 x 4–5 and each merozoite was 5 x 1. Mature microgamonts are irregular in shape, ~10–15 x 7.5–14. Macrogamonts in various stages of maturity are 14–17 x 11–17 and have a large N and many eosinophilic granules, 0.5–1 wide. Sometimes multiple stages are found in a single host cell N, each within its own PV.

Materials deposited: Photosyntypes of sporulated oocysts and histological sections are deposited in the collection of the Department of Parasitology, University of Veterinary and Pharmaceutical Sciences, Brno, Czech Republic (R 60/04). Symbiotype host (sensu Frey et al. 1992) is in the herpetological collection of the National Museums of Kenya, Nairobi (A/4138).

Remarks: This is the only species, to date, described from this family of frogs. The oocyst wall is thin and fragile and the sporocysts have the tendency to disintegrate and release free SZ into the oocyst content. Jirku and Modrý (2005) first examined oocysts after 4 mo of storage, at which time they found that 80% of sporulated oocysts contained free SZ. Intranuclear development has only been reported in three other amphibian coccidia, E. ranarum from P. esculenta and R. temporaria, E. wambaensis from H. viridiflavus, and E. grobbeni from S. atra, the Alpine salamander. In addition, the geographic origin and host phylogeny make the conspecificity with other anuran eimerians unlikely.