Type host: Parascalops breweri (Bachman, 1842), Hairy-tailed mole.

Other hosts: None reported to date.

Type locality: NORTH AMERICA: USA, Ohio, Ashtabula Co.

Geographic distribution: NORTH AMERICA: USA, Massachusetts, Ohio.

Description of oocyst: Oocyst shape: subspheroid; number of walls: 2; wall thickness: >1.0; wall characteristics: outer layer slightly sculptured, appears striated in optical cross section, ~3/4 of total thickness; inner, smooth; L x W: 16.5 x 13.6 (13-20 x 11-20); L/W ratio: 1.2 (1.0-1.5); M: absent; OR: absent; PG: absent. Distinctive features of oocyst: striated appearance of oocyst wall and absence of M, OR, and PG.

Description of sporocysts and sporozoites: Sporocyst shape: ovoid; L x W: 11.1 x 6.9 (8-14 x 5-8); L/W ratio: 1.6 (1.2-2.0); SB: present as thick cap-like covering of sporocyst; SSB: absent; PSB: absent; SR: present; SR characteristics: a single, large, lipid-like sphere; SP: no description. Distinctive features of sporocyst: thick, cap-like SB.

Prevalence: 8/16 (50%) P. breweri, including 2/9 (22%) from Franklin Co., MA and 6/7 (86%) from Ashtabula Co., Ohio.

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. 43418 (NK 3109, female), R. M. Sullivan #509, 28 June, 1980. Photosyntypes in the USNPC No. 80591.

Remarks: The sporulated oocysts of this species are similar in size to those of C. megacephali from S. aquaticus and to C. ashtabulensis; however, numerous qualititive features of both oocyst and sporocyst structures distinguish these species from each other.

References: Ford and Duszynski (1989).