Isospora ocellati McQuistion, Walden,
& Capparella, 1997
Type host: Xiphorhynchus ocellatus
napensis (Ocellated woodcreeper)
Type locality: SOUTH AMERICA:
Ecuador, Provincia de Morona-Santiago ca 5 km SW of
Taisha, 2º 22' S, 77º 30' W, 425 m elev.
Geographic distribution: SOUTH
Description of oocyst: Oocyst shape:
ovoid; number of walls: 2 wall thickness: ~1.5; wall
characteristics: smooth, colorless outer layer with darker, slightly
thicker inner layer; L x W: 20 x 17 (15-19 x 18-21); L/W ratio: 1.2
(1.0-1.3); M: absent; OR: absent; PG: present, rough, ovoid, ~2 in size.
Distinctive features of oocyst: lack of M & OR.
Description of sporocysts and
sporozoites: Sporocyst shape: ovoid; L x W: 12 x 8 (7-9 x 11-13);
L/W ratio: 1.5 (1.2-1.7); SB: present, dome or bubble-like; SSB: present,
ellipsoid, directly beneath SB; PSB: absent; SR: present; SR
characteristics: a single, spherical body composed of coarse uniform
granules or as numerous irregular clusters throughout the sporocyst; SP:
elongate, sausage-shaped with ovoid centrally located nuclei and
spherical, posterior RBs, lying randomly in sporocyst, often curled around
each other. Distinctive features of sporocyst: shape of SB.
Prevalence: 6 of 11 (55%).
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: Phototype and
formalin-preserved oocysts, USNPC #84901 and 84902, respectively.
Remarks: This species has not been
reported since its original description.
Reference: McQuistion et al. (1997).