Isospora geospizae McQuistion &
Type host: Geospiza fuliginosa
(Small ground finch)
Other Hosts: Geospiza
fortis (Medium ground finch)
Type locality: SOUTH AMERICA:
Ecuador, Galapagos Archipelago, Santa Cruz Island, Puerto Ayora & Lost
Geographic distribution: SOUTH
AMERICA: Ecuador, Galapagos Archipelago, Santa Cruz Island.
Description of oocyst: Oocyst shape:
spheroid to subspheroid; number of walls: 1; wall thickness: ~1.0; wall
characteristics: smooth, colorless; L x W: 15.5 x 14.5 (12-17 x 13-17);
L/W ratio: 1.1 (1.0-1.1); M: absent; OR: absent; PG: present. Distinctive
features of oocyst: lack of M & OR.
Description of sporocysts and
sporozoites: Sporocyst shape: ovoid; L x W: 10.0 x 7.5 (6-9 x
10-12); L/W ratio: 1.3 (1.2-1.6); SB: present as small, rounded
body; SSB: present, small; PSB: absent; SR: present; SR
characteristics: irregular-shaped, containing coarse, non-uniform
granules; SP: sausage-shaped with a large RB at each end, appearing
stuffed and randomly placed in sporocyst. Distinctive features of
sporocyst: SR and sausage-shaped SP.
Prevalence: 3 of 34 (9%) G.
fuliginosa and 1 of 9 (11%) G. fortis.
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 & Wilson