Type host: Ambystoma tigrinum (Green, 1825), Tiger salamander.

Other hosts: None reported to date.

Type locality: NORTH AMERICA: U.S.A.: Iowa, Dickinson County, near the Lakeside Laboratory.

Geographic distribution: NORTH AMERICA: U.S.A.: Iowa.

Description of oocyst: Oocyst shape: subspheroidal; number of walls: 1; wall thickness: thin layer (line drawing); wall characteristics: smooth; L x W: 20.4 x 18.3 (16-23 x 14-21); L/W ratio: 1.1; M: absent; OR: present; OR characteristics: starts as a compact mass of granules, becomes a single refractile sphere 5.2 wide ~6 d after leaving the host; PG: absent. Distinctive features of oocyst: OR changes from compact mass of granules to a refractile sphere.

Description of sporocysts and sporozoite: Sporocyst shape: ovoidal; L x W: 8.8 x 6.5 (7-10 x 5-8); L/W ratio: 1.3; SB: present as a small knob at pointed end of sporocyst; SSB: absent; PSB: absent; SR: present; SR characteristics: scattered refractile granules; SZ: no mention is made of SZ, RB, or N. Distinctive features of sporocysts: none.

Prevalence: Unknown.

Sporulation: Exogenous, 4-6 d.

Prepatent and patent periods: Unknown.

Site of infection: Unknown. Oocysts recovered from feces.

Endogenous development: Unknown.

Materials deposited: None.

Remarks: This species was found in an adult A. tigrinum, the same host animals from which E. waltoni was described. It has not been seen since its original description.