Summary
Chances for survival increase as a snail grows, and the resulting size-specific survival curve dictates hatching size. Related species tend to hatch at the same size, reflecting similarities in ecological roles. Hatching size depends upon macrohabitat and microhabitat among the Muricidae. Thais emarginata hatches large enough to escape from a major predator (the hermit crab) of newly hatched T. lamellosa. However, Thais hatching sizes reflect a general trend for upper shore muricids to hatch larger than lower shore ones, rather than a response to predators. A given volume of yolk will yield the same volume of hatchlings (regardless of hatching type or number of hatchlings) for all prosobranchs, including those whose embryos feed on nurse eggs. Therefore, no hatchlings are inflated more than others to make them less attractive to predators.
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Spight, T.M. Ecology of hatching size for marine snails. Oecologia 24, 283–294 (1976). https://doi.org/10.1007/BF00381135
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DOI: https://doi.org/10.1007/BF00381135