Eibläschen

Eibläschen is a German term that translates to "egg sac" or "ovisac." It refers to a protective structure produced by certain female animals, particularly invertebrates like insects, spiders, and mollusks, to hold and protect their eggs until they hatch. These sacs can vary greatly in appearance, size, and composition depending on the species.

Insects, for example, may deposit their eggs within a foamy secretion that hardens to form an eibläschen, or they might spin a silken sac. Spiders are well-known for their egg sacs, which are typically made of silk and can be found attached to surfaces, carried by the female, or buried in the ground. Some marine snails also produce gelatinous egg masses that function as eibläschen.

The primary purpose of an eibläschen is to safeguard the developing embryos from predators, environmental hazards such as desiccation or extreme temperatures, and physical damage. The material used in its construction can also provide nutrients for the developing eggs. Once the eggs are ready to hatch, the young will emerge from the eibläschen, often breaking through its protective covering. The specific strategies employed in forming and protecting the eibläschen are crucial for the reproductive success of many species.