Isospora geospizae McQuistion & Wilson, 1989

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 Tuneles Region.

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: Unknown.

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 (1989).