Eimeria tamiasciuri Levine, Ivens &
Type host: Microtus montanus.
Other hosts: Sciurus aberti;
S. griseus; Tamias dorsalis; T. merriami; T.
obscurus; Tamiasciurus hudsonicus; T. mearnsi.
Type locality: North America: USA, Arizona, N rim
of the Grand Canyon, near the
entrance to Grand Canyon National Park.
Other localities: Central America: Mexico, Baja
California; North America: USA,
California, New Mexico; Wisconsin.
Description of oocyst: Oocyst shape:
elongate-ellipsoid; wall thickness: 1.5;
layers: 1; outer layer colour: colourless; outer layer texture: smooth; micropyle:
absent; OR: absent; PG: present; number of PGs: 1; PG shape: not given; PG L x W:
not given; size: 32.5 x 19.3 (29-40 x 16-21); L/W ratio: 1.7 (1.4-2.0). Distinctive
features of oocyst: none.
Description of sporocysts and sporozoites:
Sporocyst shape: ovoid; size: 16 x 8; SB:
present; SB L x W: not given; SB characteristics: blunt, cone-shaped (in drawing);
SSB: absent; PSB: absent; SR: present; SR characteristics: large body in centre of
the sporocyst, or dispersed; SR size: not given; SP: elongate and curved, with
posterior RB. Distinctive features of the sporocyst: thin walled at the sides, but
broadly thickened at 1 end and tapering to SB at the other end.
Material deposited: USNPC No. 87256
Remarks: Eimeria tamiasciuri was described
by Levine et al. (1957) in Tamiasciurus hudsonicus. Since then, it has been
reported in four genera, and seven species,
including Microtus montanus in Arizona (Vance & Duszynksi, 1985).
References: Bullock (1959); Dorney (1962, 1963,
1966); Hill & Duszynski (1986);
Levine et al. (1957); Mahrt & Chai (1970); Patrick & Wilson (1995); Soon & Dorney
(1969); Vance & Duszynski (1985).