Eimeria lateralis Levine, Ivens &
Type host: Spermophilus lateralis.
Synonyms: Eimeria beldingii; E.
larimerensis; E. sarseni; E. tuscarorensis; E.
Other hosts: Cynomys gunnisoni; C.
leucurus; C. ludovicianus; M. baibacina; M. bobak; M.
monax; Spermophilus armatus; S. beecheyi; S. beldingi;
S. columbianus; S. elegans; S. richardsonii; S.
townsendii; S. tridecemlineatus; S.
variegatus; T. obscurus; Tamias striatus.
Type locality: North America: USA, Arizona, Point
Imperial on the north rim of the
Grand Canyon, Grand Canyon National Park.
Other localities: Asia: Kazakhstan; North America:
Canada, Alberta; USA, Arizona,
California, Colorado, Idaho, Illinois, Massachusetts, Montana, New York,
Pennsylvania, Utah, Wisconsin, Wyoming; Central America: Mexico, Baja
Description of oocyst: Oocyst shape: ellipsoid to
ovoid; wall thickness: ~2; layers:
2; outer layer proportion of total thickness: 3/4; outer layer colour: yellow-brown;
outer layer texture: rough; inner wall characteristics: smooth, pale; micropyle:
absent; OR: absent; OR characteristics: present only during sporulation; PG:
present; number of PGs: 1-14; PG shape: rounded; PG L x W: 1 x 1; size: 35.1 x 26.8
(28-40 x 24-31); L/W ratio: 1.3 (1.0-1.5). Distinctive features of oocyst: large
size, thick outer wall and an OR that disappears during the sporulation
Description of sporocysts and sporozoites:
Sporocyst shape: ovoid; size: 16 x 10;
SB: present; SB L x W: not given; SB characteristics: prominent; SSB: absent; PSB:
absent; SR: present; SR characteristics: large; numerous granules throughout
sporocyst; SR size: not given; SP: rod-shaped. Distinctive features of sporocyst: SR
that surrounds and almost obscures SP.
Material deposited: USNPC No. 87251
Remarks: Eimeria lateralis was described by
Levine et al. (1957) in S. lateralis. In
1962, Dorney described what he called E. wisconsinensis (25.9-35.3 x
T. striatus and in 1965 he described E. tuscarorensis (30.2-36.4 x
M. monax. The oocysts of both species are indistinguishable from each other
E. lateralis, but were given different names because they occurred in
genera. Given the structural unity of these forms and the knowledge that marmotine
Eimeria spp. can cross host generic boundaries, we believe it prudent to make
E. wisconsinensis and E. tuscarorensis junior synonyms of E.
Nukerbaeva & Abenov (1979) described E. sarseni (38 x 35) from M.
however, their photomicrograph showed a sporulated oocyst more ellipsoid than
indicated by their measurements and it closely resembled E. tuscarorensis (=
E. lateralis, see above). Although they mentioned E. tuscarorensis in
introduction, they failed to compare it to their new species. The oocysts they
measured were slightly larger than E. lateralis, but appear to be the same
Veluvelo & Levine (1986) described E. beldingii (30-37 x 25-31) from
S. beldingi, but it does not differ in any substantive way from E.
lateralis and, in
our opinion, also should become a junior synonym. Recently, Seville & Stanton
(1993a) synonymised E. larimerensis with E. lateralis, a decision with
which we agree.
References: Broda & Schmidt (1978); Dorney (1962,
1963, 1965, 1966); Duncan (1968);
Fleming et al. (1979); Hill & Duszynski (1986); Hilton & Mahrt (1971); Levine et al.
(1957); McQuistion & Wright (1984); Nukerbaeva & Abenov (1979); Seville (1997);
Seville & Stanton (1993a, b); Seville & Williams (1989); Seville et al. (1992);
Shults et al. (1990); Stanton et al. (1992); Thomas & Stanton (1994); Todd & Hammond
(1968b); Veluvolu & Levine (1984); Vetterling (1964); Wilber et al. (1994).