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

Other hosts: None reported to date.

Type locality: NORTH AMERICA: U.S.A.: Iowa, Dickinson County.

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

Description of oocyst: Oocyst shape: elongate ellipsoidal initially, but quickly becomes distorted in 3% K2Cr2O7 solution when placed under a coverglass; number of walls: 1; wall thickness: very thin layer (line drawing); wall characteristics: smooth; L x W: 29.2 x 15.5 (27-31 x 14-16); L/W ratio: 1.9; M: absent; OR: present; OR characteristics: scattered refractile granules; PG: absent. Distinctive features of oocyst: very thin wall that distorts easily when prepared for viewing with a light microscope.

Description of sporocysts and sporozoite: Sporocyst shape: elongate ellipsoidal; L x W: 12.4 x 7.3; L/W ratio: 1.7; SB: absent; SSB: absent; PSB: absent; SR: present; SR characteristics: compact mass of small granules; SZ: appear sausage-shaped (line drawing), slightly longer than sporocyst and without a bisible RB or N. Distinctive features of sporocysts: ellipsoidal shape and absnece of SB; also, sporocysts appear tightly packed within confines of oocyst wall (line drawing).

Prevalence: Unknown.

Sporulation: Exogenous; 1/3 of the oocysts sporulated after 76 h, where 2/3 sporulated after 5 days; the temperature at hich they were maintained was not given.

Prepatent and patent periods: Unknown.

Site of infection: Unknown. Oocysts recovered from feces.

Endogenous development: Unknown.

Materials deposited: None.

Remarks: The type host was a larval A. tigrinum. Unsporulated oocysts were about the same size as sporulated ones, 27.5 x 15.5. This species has not been seen since its original description.