Eimeria dissimilis Yakimoff and
Type host: Sorex araneus
Linnaeus, 1758, Eurasian common (Gomel) shrew.
Other hosts: Sorex minutus
Linnaeus, 1766, Pygmy shrew.
Type locality: EUROPE: Russia, Gomel
EUROPE: Bulgaria,; Lithuania; Russia.
Description of oocyst: Oocyst shape:
ovoidal with both ends either rounded or pointed;
number of walls: 1;
wall thickness: ~1.0;
wall characteristics: smooth, yellow;
L x W: 28.0 x 19.4 (18-33 x 13-24);
L/W ratio: 1.4;
Distinctive features of oocyst: elongate, ovoidal shape with
Description of sporocysts and
Sporocyst shape: ellipsoid (line drawing);
L x W: 15 x 10 (from Golemansky, 1979);
SR: presence or absence could not be determined by the authors, but none
shown in their drawing;
SP: sausage-shaped without RB (line drawing).
Distinctive features of sporocyst: nondescript, without SB.
Prevalence: 1/26 (4%) from the
Gomel District, Russia; 1/2 (50%) in S. minutus from
Bulgaria (golemansky, 1979).
Prepatent and patent periods:
Site of infection: Unknown. Oocysts
recovered from feces and intestinal contents.
Materials deposited: None.
Remarks: No information on
sporocyst structure was given in the original description by
Yakimoff an Gousseff (1935), although they did provide 2 line
drawings which, unfortunately, are quite different. The first
shows an oocyst with rounded ends and 4 sporoblasts, while the
second is 25% larger and shows an oocyst with pointed ends. Either the
oocysts increase in size during sporulation or during patency, or they
were dealing with 2 differnt species, or most likely, the oocysts were
not drawn to scale relative o each other. This species was reported for
the second time in S. minutus by Golemansky (1979) from the
Parangalista Reserve in Bulgaria; the oocysts he saw were 27-29 x 23-25
and sporocysts were 15 x 10. It also was reported from S. araneus
from the Zagare Botancial and Zoological Preserve, Lithuania, by
Arnastauskiene and Maldziunaite (1979).
References: Yakimoff and
Gousseff (1935); Arnastauskiene and Maldziunaite (1979); Golemansky