Type host: Neurotrichous gibbsii (Baird, 1858), American shrew mole .

Other hosts: None reproted to date.

Type locality: NORTH AMERICA: USA, Oregon, Benton Co., 11.3 km E of Alsea.

Geographic distribution: NORTH AMERICA: USA, Oregon, Washington.

Description of oocyst: Oocyst shape: ovoid; number of walls: only 1 obvious layer; wall thickness: ~1; wall characteristics: it thins sightly at one end and has a striated appearance under Nomarski optics; L x W: 17.6 x 13.6 (16-20 x 11-16); L/W ratio: 1.3 (1.15-1.5); M: absent; OR: absent; PG: 1, irregular in shape, ~3.0 x 1.5. Distinctive features of oocyst: rather small size, irregularly-shaped PG, and nondescript outer wall.

Description of sporocysts and sporozoites: Sporocyst shape: ovoid; L x W: 10.7 x 5.5 (9-12 x 5-6); L/W ratio: 2.0 (1.75-2.1); SB: present, small, pointed, nipple-like; SSB: absent; PSB: absent; SR: present; SR characteristics: consists of many granules or globules of various sizes in an irregular, central mass in sporocyst; SP: each with a large, posterior RB. Distinctive features of sporocyst: nipple-like SB.

Prevalence: 2/18 (11%).

Sporulation: Exogenous. Oocysts sporulated in 7-10 days in 2.5% aqueous (w/v) potassium dichromate solution at 23 C.

Prepatent and patent periods: Unknown.

Site of infection: Unknown. Oocysts recovered from feces and intestinal contents.

Materials deposited: Skin, skull, skeleton and tissues of the symbiotype host are preserved in the Mammal Division of the Museum of SW Biology, UNM: MSB No. 40785 (NK 754, male), D.J. Hafner #1553, 23 June, 1979. Photosyntypes in the USNPC No. 85999.

Remarks: Oocysts of this species most closely resemble those of E. bentongi Colley and Mullin, 1971 described from the lesser gymnure in Malyasia. They differ from E. bentongi in genral shape (ovoid vs subspheroid), by having a thinner oocyst wall (~1.0 vs 1.5) that appears striated in optical cross section, and by having SP with a large, clear posterior RB. This species has not been reported since its original description.

References: Duszynski (1985).