You can manage bookmarks using lists, please log in to your user account for this.
Media type:
E-Article
Title:
Observations on Reproduction in Helix aspersa
Contributor:
Herzberg, Fred;
Herzberg, Anne
Published:
University of Notre Dame, 1962
Published in:
The American Midland Naturalist, 68 (1962) 2, Seite 297-306
Language:
English
ISSN:
0003-0031;
1938-4238
Origination:
Footnote:
Description:
There are five distinct periods involved in the life history of Helix aspersa. This study is concerned with those portions of the reproductive cycle which are grossly visible, and particularly with the time involved in each period. Preliminary maneuvering averages 30 minutes, and subsequent copulation time 6.5 hours. From copulation to oviposition averages 10 days. A mean of 53 eggs are oviposited, with the eggs deposited at a rate of one per 11 minutes. Weight losses following oviposition were roughly proportional to the number of eggs deposited, and weight recovery took from 19 to 23 hours. Hatching time averaged 10 days and nesting 6 days, with the newly hatched animals coming to the surface at angles of 30 to 45 degrees. An explanation is suggested concerning variations in data presented here as compared to that given in earlier reports on the same subject.