Type host: Pseudacris streckeri Wright and Wright, 1933, Strecker's chorus frog.

Other hosts: Pseudacris triseriata (Wied-Nuweid, 1838), Western chorus frog.

Type locality: NORTH AMERICA: U.S.A., Texas, Dallas County.

Other localities: NORTH AMERICA: U.S.A., Nebraska, Lancaster County, Pawnee Lake (40º 51' 10.8" N, 96º 53' 6.6" W).

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

Description of oocyst: Oocyst shape: spheroidal, rarely subspheroidal; number of walls: 1; wall thickness: ~0.7; wall characteristics: smooth; L x W: 18.8 x 18.7 (17-21.5 x 17-21); L/W ratio: 1.0 (1.0-1.1); M: absent; OR: present; OR characteristics: spheroidal, composed of numerous coarse granules surrounding a large vacuolated or globular area; PG: usually absent; number of PGs: 1 may be found, but rare. Distinctive features of oocyst: none.

Description of sporocysts and sporozoite: Sporocyst shape: ovoidal; L x W: 11.1 x 7.7 (10-13 x 7-9); L/W ratio: 1.5 (1.2-1.7); SB: present as light thickening at pointed end, indistinct; SSB: absent; PSB: absent; SR: present; SR characteristics: an aggregate of granules bound by a limiting membrane, 6.6 x 5.7 (5-8 x 4-7), but additional granules are often found free among the SZ; SZ: 11.0 x 2.6 (10-13 x 2-3) in situ. each with 2 RBs; anterior-central RB spheroidal to slightly ovoidal, 2.2 x 2.0 (1-3 x 1-2); posterior RB spheroidal, 1.6 (1-2); N located between the 2 RBs. Distinctive features of sporocysts: none.

Prevalence: 16 of 34 (47%) in P. streckeri in Texas (Upton & McAllister 1988); 2 of 30 (7%) in P. triseriata in Nebraska (Bolek et al. 2003).

Sporulation: Presumably exogenous.

Prepatent and patent periods: Unknown.

Site of infection: Unknown, but see Remarks.

Endogenous development: Unknown..

Materials deposited: Photosyntypes of sporulated oocysts in the HWML, Lincoln, NE (HWML 16977).

Remarks: About half of the known eimerians from anura have spheroidal to subspheroidal sporulated oocysts. Of these, only 5 are reported to possess an OR: E. algonquini, E. cyanophlyctis, E. leptodactyli, E. prevoti and E. streckeri. Sporulated oocysts of this species differ from E. algonquini by having larger oocysts and much smaller sporocysts that have a SB, which those of E. algonquini lack. This species’ oocysts and sporocysts are distinguished from those of E. cyanophlyctis by being more spheroidal and the presence of a SR, which E. cyanophlyctis lacks. They differ from E. leptodactyli by having smaller and more spheroidal oocysts and larger sporocysts, and from E. prevoti by its more spheroidal shape and much larger OR. The oocysts seen by Bolek et al. (2003) in P. triseriata from Nebraska were remarkably similar to those in the original description (Upton & McAllister 1988) in size and shape. The major difference was that those from Nebraska had a distinctive globular body in the OR, which remained constant in form during a period of 6 mo while being refrigerated in 2.5% K2Cr2O7 solution. Upton and McAllister (1988) reported the site of infection for this species as the intestine, but their oocysts were recovered from the feces and no attempt was made to check what organs were infected with the developmental stages of E. streckeri; therefore, the site of infection of this species is unknown.