Isospora cebi Marinkelle,
Type host: Cebus albifrons (Humboldt, 1812),
Other hosts: None reported to date.
Type Locality: SOUTH AMERICA: Colombia, Alto
Geographic Distribution: SOUTH AMERICA: Colombia,
Alto Magdalena region.
Description of oocyst: Oocyst shape: subspheroid;
number of walls: 1
(confirmed by crushing oocyst); wall thickness: 0.4-0.7; wall characteristics:
colorless and smooth; L x W: 20.9 x 19.8 (19-23 x 16.5-21); L/W ratio: 1.1; M:
absent; OR: absent; PG: absent. Distinctive features of oocyst: thin, 1-layered
Description of sporocysts and sporozoites:
Sporocyst shape: slightly
ovoid; L x W: 14.9 x 11.2 (12-17 x 9-14); L/W ratio: 1.3; SB: present; SB
characteristics: small, but pronounced; SSB: absent; PSB: absent; SR: present; SR
characteristics: compact, round, granular, relatively small; SP: reniform, fill ~
3/4 of the sporocyst. Distinctive features of the sporocyst: very thin wall,
0.2-0.4, and small, but distinct SB; also, SP do not fill the sporocyst as in most
species. One of only 2 primate Isospora with a SB.
Prevalence: 1/4 (25%) C. albifrons from the
Magdalena region, but 0/2 from
the Antioquia region and 0/6 from unknown localities of Colombia.
Sporulation: Exogenous. Sixty percent of the
oocysts sporulated in 3 days at 25ºC.
Prepatent and patent periods: Unknown.
Site of infection: Unknown. Oocysts recovered from
Material deposited: None.
Remarks: Marinkelle (1969) also measured
unsporulated oocysts which were
slightly smaller than sporulated oocysts: 20.1 x 18.8 (18-22 x 16-20). This species
has not been reported since Marinkelle's original report (1969). Because the
sporocysts of this species possess SBs, Lindsay et al. (1997) believe it is a
pseudoparasite of the capuchin, probably of bird origin, just passing through the
intestinal tract, but there is no way to dispute or verify this idea given the
References: Lindsay et al. (1997); Marinkelle