Eimeria tamiensis Seville and Patrick, 2001.
Type host: Tamias striatus (Linnaeus, 1758), Eastern chipmunk.
Type locality: NORTH AMERICA: United States, Pennsylvania, Armstrong County, 40º 54' 35" N, 79º 31' 30" W.
Geographic distribution: NORTH AMERICA: United States.
Description of oocyst: Oocyst shape: ovoid;
number of walls: 2;
wall thickness: ~1.8;
wall characteristics: outer rough/pitted, striated in cross section, yellow-brown, ~3/4 of total thickness, inner smooth and colorless;
L x W: 18.6 x 14.5 (16-23 x 12-17);
L/W ratio: 1.3 (1.0-1.5);
PG: present, 0-2;
Distinctive features of oocyst: oocyst wall is occasionally thin at the narrow end.
Description of sporocysts and sporozoites:
Sporocyst shape: ellipsoid;
L x W: 8.6 x 5.4 (7-10 x 4-8);
L/W ratio: 1.6 (1.3-2.0);
SB: present, usually small and clear;
SSB: may be present;
SR characteristics: usually 2 or more clustered granules or rarely dispersed granules;
SP: each with 1 o2 rounded RB.
Distinctive features of sporocyst: none.
Prevalence: 25 of 41 (74%).
Sporulation: Exogenous. Oocysts sporulated in 2% (w/v) aqueous potassium dichromate solution at RT.
Prepatent and patent periods: Unknown.
Site of infection: Colon.
Materials deposited: Photosyntypes deposited in the USNPC no. 89751.
Remarks: Of 3 species described from marmotine rodents that do not posess a M and have a rough outer wall (E. berkinbaevi, E. lateralis, and E. ovata), E. tamiensis differs from them all by being considerably smaller in length and width.
References: Seville and Patrick (2001).