A preliminary study on the biology of the predatory terrestrial mollusk Rathouisia leonina

文献类型： 外文期刊

第一作者： Wu, M

作者： Wu, M;Guo, JY;Wan, FH;Qin, QL;Wu, Q;Wiktor, A

作者机构：

期刊名称：VELIGER （ 影响因子：0.125； 五年影响因子：0.381 ）

ISSN： 0042-3211

年卷期： 2006 年 48 卷 2 期

页码：

收录情况： SCI

摘要： A study about the natural history of the slug Rathouisia leonina Heude, 1882 was carried out both in the field and in the laboratory. The external morphology, distribution, habitat, food range and preference, predatory behavior and reproduction were studied. Adult slugs were up to 1.02 g in weight and 35 mm long when kept inactive. They always preyed upon eggs, juveniles and adults of snails, rather than those of slugs of other families. Smaller individuals (0.18-0.55 g) showed preferences for feeding on bradybaenid snails Trichobradybaena submissa with larger diameter and larger apertural opening, while larger slugs (0.63-1.02 g) showed no such preference. The slugs also showed a preference for the eggs of Acusta ravida over those of Bradybaena similaris and T. submissa. The length of feeding scars on snail eggs made by infant slugs measured 0.24-0.47 mm, and those made by adult slugs 0.41-0.62 mm. After copulation adult slugs laid 10-49 eggs per clutch. The number of eggs was not correlated with their parent slugs' weight but the diameter of the eggs (1.88-3.09 mm) showed a positive correlation to the parent slugs' weight. It took 25-29 days for the eggs to hatch at 17.5-23.5 degrees C, 86% +/- 5% RH in the laboratory.

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