Eimeria chagasi Yakimoff and
Type host: Sorex araneus Linnaeus,
1758, Eurasian common (Gomel) shrew.
Synonyms: Eimeria komareki Cerna
and Daniel, 1956; Eimeria komareki of Arnastauskiene and
Maldziunaite, 1979; E. komareki of Arnastauskiene, 1980.
Other hosts: Sorex arcticus
Arctic shrew; Sorex minutus Linnaeus, 1766, Pygmy shrew.
Type locality: ASIA: Russia,
EUROPE: Bulgaria,; Czechoslovakia; ASIA: Russia.
Description of oocyst: Oocyst
shape: spheroid to slightly subspheroid ;
number of walls: 1;
wall thickness: ~1.0;
wall characteristics: smooth colorless;
L x W: 14.5 (13-19 x 12-15);
L/W ratio: 1.0-1.1;
Distinctive features of oocyst: small, spheroid size and shape
Description of sporocysts and
Sporocyst shape: ellipsoid;
L x W: 8-9 x 4-5;
SR characteristics: a mass of small granules in center of sporocyst
between the SP;
SP: sausage-shaped without a RB.
Distinctive features of sporocyst: nondescript, without a SB.
Prevalence: 1/26 (4%) from the
type host; 1/17 (6%) in Bulgaria.
Sporulation: Exogenous. Oocysts
sporulated in 1-2 days in 1.5% aqueous (w/v) potassium
Prepatent and patent
Site of infection: Oocysts in original
description recovered from feces and intestinal contents, but gamogony,
according to Cerna (1961) occurs in the small intestine.
Materials deposited: None.
Remarks: Very little information on
oocyst structure was given in the original description. Yakimoff and
Gousseff (1935) described the oocysts as spheroid, 14.5 in diameter,
without an OR, but with a PG and they did provide a line drawing. Cerna
and Daniel (1956) described similar oocysts from S. araneus, but
called it E. komarki. Both descriptions are incomplete by any
measure, but their descriptions and respective line drawings are
identical; thus they are probably the same species. Cerna (1961)
described the micro- and macrogamonts (which she stilled called E.
komareki) from S. araneus collected from Sarka near Prague,
Czechoslovakia. Thus, the preceding information given is a synthesis
from these three papers. Cerna also said she saw E.
komareki in Neomys fodiens, but Golemansky (1978)
named the form Cerna saw as E. neomyi. In the same paper,
Golemansky (1978) described E. ropotamae from
Crocidura leucodon; the description he gave shows only a
small size difference between the sporulated oocysts of E.
neomyi and E. ropotomae and his drawings of both are
indistinguishable. It is possible that the difference in oocyst
size may be attributed to the variability in host species
discussed by Reduker et al.(1985) or to inherent individual
variability in oocysts size over patency (Duszynski, 1971), or
both. If true, E. komareki, E. neomyi, and E.
ropotomae may all be synonyms of E. chagasi.
Additional studies are needed to determine if this is the case.
References: Yakimoff and Gousseff
(1935); Cerna and Daniel (1956); Cerna (1961); Golemansky and Yankova
(1973); Arnastauskiene and Maldziunaite (1979); Golemansky (1979);