Mollusk Eobania vermiculata (M
ller, 1774) (Gastropoda; Pulmonata; Helicidae) under Laboratory Conditions
S. S. Kramarenko* and V. N. Popov**
* Nikolaev Regional Sanitary and Epidemiological Station, ul. Lazurnaya 1, Nikolaev, 327058 Ukraine
** Simferopol State University, Yaltinskaya ul. 4, Simferopol, 333036 Ukraine
Received March 31, 1998
Abstract—Variation in reproductive indices of the introduced terrestrial mollusk Eobania vermiculata
(Müller,1774) from populations living in different natural climatic zones of the Crimea was analyzed under lab-
oratory conditions. It was shown that the species is characterized by a significant variation in clutch size, which
ranges from 24 to 175 eggs, averaging 81.0 
3.5 eggs. Egg size within the same local population or the same
clutch can also vary considerably. Eggs are slightly oval, with small and large diameters averaging 3.48 0.02
and 3.71 0.02 mm; average egg weight is 0.023 0.001 g, ranging from 0.020 to 0.036 g in different clutches.
Hatchability in different clutches varies from 37.7 to 92.0% (on average, 66.8 11.9%). An increase in exper-
imental population density from 10 to 40 individuals per Petri dish resulted in a statistically significant decrease
in growth rate of the large shell diameter in juvenile E. vermiculata, a decrease in average shell size, and an
increase in its variation.
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