Eimeria monacis Fish, 1930.
Type host:Marmota monax
Synonyms: Eimeria os;
Other names: Eimeria
Other hosts: Marmota baibacina; M.
bobak; M. marmota; M. menzbieri; M. sibirica.
Type locality: North America: USA, Washington, DC,
after capture, the marmot was kept in the lab.
Other localities: Asia: Buratia; Kazakhstan; North
America: USA, Iowa.
Description of oocyst: Oocyst shape: ovoid; wall
thickness: not given; layers: 1;
outer layer colour: not given; outer layer texture: smooth; micropyle: absent; OR:
present; OR characteristics: small compact mass (in drawing); OR L x W: not given;
PG: absent; size: 20.0 x 18.3 (17-24 x 15-21); L/W ratio: 1.2. Distinctive features
of the none.
Description of sporocysts and sporozoites:
Sporocyst shape: ovoid; size, estimated
from drawing: 8 x 6; SB: present; SB L x W: not given; SB characteristics:
prominent; SSB: absent; PSB: absent; SR: present; SR characteristics: granular,
located in centre of sporocyst (see drawings in Fish, 1930; Crouch & Becker, 1931);
SR size: not given; SP: not described. Distinctive features of sporocyst:
Remarks: Eimeria monacis was described by
Fish (1930) in M. monax. Here we
synonymise E. perforoides Crouch & Becker, 1931 (20 x 14) with E.
the descriptions of the two forms are indistinguishable. Svanbaev (1963) described
E. os from M. menzbieri, but Levine & Ivens (1965), with whom we
agree, thought it
was E. monacis, presumably because Svanbaev (1963) saw an oocyst residuum
feature of E. os), and did not report a micropyle (which is a feature of
Svanbaev (1963) also found what he called E. monacis, but Levine & Ivens
it the new name, E. tyanshanensis. However, Svanbaev's (1963) description is
inadequate and there is no illustration; therefore, E. tyanshanensis is a
inquirenda. Dorney (1965) found what he called E. monacis in M.
monax, but it is
indistinguishable from E. callospermophili. Fleming et al. (1979) and
Wright (1984) also reported E. monacis from M. monax. However, they
Dorney's (1965) paper; thus, it is likely they all observed E.
References: Crouch & Becker (1931); Dorney (1965);
Fish (1930); Fleming et al.,
(1979); Iwanoff (1934); Levine & Ivens (1965); McQuistion & Wright (1984); Machulsky
(1949); Nukerbaeva & Abenov (1979); Svanbaev (1963).