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

Other hosts: None reported to date.

Type locality: NORTH AMERICA: USA, Washington, Pierce Co., R3E, T20N, Sec. 24, 5.8 km S., 3.8 km E of Tacoma Center.

Geographic distribution: NORTH AMERICA: USA, Washington.

Description of oocyst: Oocyst shape: subspheroid to ellipsoid; number of walls: 2; wall thickness: ~1.5; wall characteristics: outer, ~2/3 of total thickness, smooth, colorless to pale yellow with a membranous cap-like structure (amicropylar cap, see Duszynski, 1985) at one end that appears foamy in consistency and measures 1-5 high x 6-12 wide; inner, light blue to light green; L x W: 25.5 x 21.4 (23-27 x 18-23); L/W ratio: 1.2 (1.1-1.3); M: absent; OR: absent; PG: absent. Distinctive features of oocyst: only oocyst described to date from insectivores with an amicropylar cap.

Description of sporocysts and sporozoites: Sporocyst shape: ovoid; L x W: 13.6 x 10.0 (12-15 x 9-11); L/W ratio: 1.3 (1.2-1.6); SB: absent; SSB: absent; PSB: absent; SR: present; SR characteristics: a compact, faceted mass, ~6-8 x 5-6 that appears membrane-bound; SP: with 2 RB: an elongate posterior one and a spheroid central one. Distinctive features of sporocyst: absence of SB abd SSB and SP with 2 RB.

Prevalence: 2/17 (12%)

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. 43477 (NK 3162, female), R.M. Sullivan #519, 8 July, 1980. Photosyntypes in the USNPC No. 85986.

Remarks: This species has not been reported since its original description.

References: Duszynski (1985).