Eimeria cynomysis Andrews, 1928.
Type host: Cynomyc ludovicianus
Synonyms: Eimeria bilamellata;
Other hosts: Cynomys gunnisoni;
leucurus; C. ludovicianus; Cynomys sp.; Spermophilus
armatus; S. beecheyi; S. citellus; S.
columbianus; S. elegans; S. franklinii; S.
lateralis; S. richardsonii; S. townsendii; S.
tridecemlineatus; S. variegatus.
Type locality: Andrews' (1928) host
(Cynomys sp.) was from an
"animal supply house." He did the analysis in North America: USA, Ohio,
but it is not clear where the hosts originated.
Other localities: Europe: Czech Republic;
America: Canada, Alberta;
USA, California, Colorado, Idaho, Iowa, Ohio, Utah, Wyoming.
Description of oocyst: Oocyst shape:
layers: 2; outer layer proportion of total thickness: not given; outer
layer colour: brownish-yellowish, transparent; outer layer texture: rough;
inner wall characteristics: orange-yellow; micropyle: present; micropyle
width: 5-6; MC: absent; OR: absent; PG: 0-1; oocyst L x W: 35.4 x 30.0 (33-37 x
28-32); L/W ratio: 1.2. Distinctive features of oocyst: the largest
eimerian species with a MP described from the Marmotini.
Description of sporocysts and
Sporocyst shape: ovoid;
size:13-17 x 8-12; SB: present; SB L x W: not given; SB characteristics:
small (in drawing); SSB: absent; PSB: absent; SR: present; SR
characteristics: coarsely granular, large amounts; SR size: not given; SP:
attenuated reniform, 12-16 x 4-7; no interior structures observed.
Distinctive features of sporocyst: the SR is membrane-bound (in drawing),
but this feature was not mentioned by Andrews (1928).
Material deposited: USNPC No. 87250
Remarks: Eimeria cynomysis was
described in "the
North American prairie
dog," Cynomys sp., likely C. ludovicianus (Andrews, 1928).
Later, Hall &
Knipling (1935) found a species in S. franklinii that they called
eubeckeri (27.6-40.2 x 21.0-32.4), but Levine & Ivens (1965)
it with E. bilamellata (25.6-35.6 x 22.4-25.6) (which we synonymize
E. cynomysis), and we agree. Vetterling (1964) emended the original
description of E. cynomysis, but his oocysts were smooth-walled and
prominent SB while those of E. cynomysis described by Andrews
rough-walled with an inconspicuous SB. We rename Vetterling's species in
this paper (below) and synonymize E. bilamellata with E.
the oocysts of both forms are indistinguishable from each other. Wilber et
al. (1994) noted that oocysts sometimes contain 1 PG, whereas Andrews
(1928) found no PG and Henry (1932) does not mention a PG.
References: Andrews (1928); Hall &
(1935); Henry (1932); Hilton
& Mahrt (1971); Kietzmann and Kietzmann, 1987; Pellérdy & Babos (1953);
Ryšavy (1957); Seville (1997); Seville & Stanton (1993b); Seville &
Williams (1989); Seville et al. (1992); Shults et al. (1990); Stanton et
al. (1992): Thomas & Stanton (1994); Todd et al. (1968); Torbett et al.
(1982); Vetterling (1964); Wilber et al. (1994).