Isospora aquatici Ford and Duszynski, 1988

Type host: Scalopus aquaticus (Linnaeus, 1758), Eastern American mole.

Other hosts: None reported to date.

Type locality: NORTH AMERICA: USA, Texas, Motley Co.

Geographic distribution: NORTH AMERICA: USA, Texas.

Description of oocyst: Oocyst shape: subspheroid; number of walls: 2; wall thickness: ~2.5; wall characteristics: outer layer rough, yellow-brown, ~3/4 of total thickness; L x W: 20.9 x 18.4 (15-24 x 13-21); L/W ratio: 1.1 (1.0-1.35); M: absent; OR: absent; PG: absent. Distinctive features of oocyst: thick, rough, outer wall and lack of M, OR, and PG.

Description of sporocysts and sporozoites: Sporocyst shape: ellipsoid; L x W: 11.8 x 9.0 (9-14 x 7-11); L/W ratio: 1.4 (1.1-1.5); SB: absent; SSB: absent; PSB: absent; SR: present; SR characteristics: many small, dispersed globules that obscure SP; SP: obscured by SR. Distinctive features of sporocyst: lack of SB, SSB.

Prevalence: 2/13 (15%).

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. 46334 (NK 4858, female), R.M. Sullivan #625, 14 March, 1981. Photosyntypes in the USNPC No. 85989.

Remarks: Oocysts of this species are similar in size to those of I. rastegaievae, but differ from it by the thickness (2.5 vs 1.0) and structure (rought vs smooth) of the oocyst wall.

References: Ford and Duszynski (1988).