Eimeria cryptotis McAllister and
Type host: Cryptotis parva parva
(Say, 1823), Least shrew.
Type locality: NORTH AMERICA:
U.S.A., Texas, Dallas County, 2.4 km E. of DeSoto off FM 1382 on
Geographic distribution: NORTH
AMERICA: U.S.A., Texas.
Description of oocyst: Oocyst shape:
number of walls: 2;
wall thickness: 1.2;
wall characteristics: outer, apparntly smooth, ~2/3 of total thickness;
L x W: 16.4 x 15.3 (14-18 x 13-17);
L/W ratio: 1.1 (1.0-1.2);
PG: 1, always attached to inner surface of wall;
Distinctive features of oocyst: attachment of PG to inner
surface of wall.
Description of sporocysts and
Sporocyst shape: ovoid;
L x W: 10.6 x 7.0 (9-11 x 6-8) with a smooth, thin, single-layered wall
L/W ratio: 1.5 (1.4-1.8;
SB: present as a thickend end of the sporocyst;
SSB: present, ~1.6 high x 3.2 wide;
SR characteristics: a large diffuse mass of granules filling sporocyst,
~5.7 x 4.9 (5-8 x 4-6);
SP: 9-11 x 2.4, aranged head to tail with posterior ends recurved around
one end of sporocyst, each with a centrally located N, but without RB.
Distinctive features of sporocyst: large SSB and the curved SP
Prevalence: 1/14 (7%)
Sporulation: Exogenous. Oocysts
sporulated in 7 days in 2.5% (w/v) aqueous potassium dichromate
solution at ~23 ºC.
Prepatent and patent periods:
Site of infection: Unknown.
Oocysts recoverd from feces and intestinal contents.
Materials deposited: Symbiotype
host is preserved in the Arkansas State University Museum of
Zoology, ASUMZ No. 17740 (male), C.T. McAllister #91, 29 May
1987. Photosyntypes in the USNPC No. 87395.
Remarks: No other eimerian from shrews
has a PG that has been reported to stick to the inner wall of the
oocyst along with sporocysts with a SSB.
and Upton (1989).