Isospora robini McQuistion, 1988
Type host: Turdus migratorius
Type locality: NORTH AMERICA:
United States, Illinois.
Geographic distribution: NORTH
AMERICA: United States, Illinois.
Description of oocyst: Oocyst shape:
ovoid to ellipsoid; number of walls: 1; wall thickness: ~1.0; wall
characteristics: smooth, brownish in color; L x W: 20 x 23 (16-22 x
20-28); L/W ratio: 1.2; M: absent; OR: absent; PG: present, prominent,
round to ovoid. Distinctive features of oocyst: lack of OR.
Description of sporocysts and
sporozoites: Sporocyst shape: ovoid; L x W: 13.8 x 9.0 (7-12 x
10-17); L/W ratio: 1.5; SB: present as a protruding, nipple-like body;
SSB: present, prominent; PSB: absent; SR: present; SR characteristics:
granular, smoothly contoured, but irregularly shaped; SP: sausage-shaped
with RB at each end and generally lie lengthwise in sporocyst. Distinctive
features sporocyst: prominent SB and SSB.
Prevalence: 4 of 12 (33%).
Sporulation: Exogenous. Oocysts were
stored in 2.5% (w/v) aqueous potassium dichromate solution at
ambient temp. prior to examination.
Prepatent and patent periods:
Site of infection: Unknown.
Oocysts found in feces.
Materials deposited: None.
Remarks: This species has not been
reported since its original description.
Reference: McQuistion (1988).