Eimeria titthus Ford and Duszynski, 1989
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 smooth, light yellow, ~2/3 of total thickness; inner smooth;
L x W: 15.8 x 13.5 (13-19 x 11-17);
L/W ratio: 1.2 (1.1-1.6);
OR characteristics: scattered granules;
Distinctive features of oocyst: none.
Description of sporocysts and sporozoites:
Sporocyst shape: ellispoid, pointed at end with SB;
L x W: 11.2 x 5.8 (9-13 x 4-7);
L/W ratio: 1.9 (1.7-2.3);
SB: present as a protruding, nipple-like structure;
SSB: present, slightly wider than SB;
SR characteristics: a few small, dispersed granules;
SP: not described.
Distinctive features of sporocyst: protruding, nipple-like SB with SSB.
Prevalence: 4/16 (25%), including 1/9 (11%) from Franklin Co., MA and 3/7 (43%) from Ashtabula Co., OH.
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. 80588.
Remarks: Oocysts of this species resemble those of E. bentongi and E. neurotrichi (Colley and Mullin, 1971; Duszynski, 1985). In additon to host and geographic differences between these species, oocysts of E. titthus differ from those of E. bentongi by having a thinner oocyst wall (1.0 vs 1.5), by having sporocysts with a larger L/W ratio (1.9 vs 1.7), and by the protruding, nipple-like SB with a SSB, both of which E. bentongi lacks. Oocysts of E. neurotrichi have only 1 thin wall (vs 2) and contain sporocysts without a SSB or protruding SB.
References: Ford and Duszynski (1989).