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When the light is shining through the collar, it is possible to make out the individual egg capsules within it. Sand collars are the characteristic egg masses of one family of sea snails, the moon snails, marine gastropod mollusks in the family Naticidae. These egg masses are often found washed up either whole, or sometimes in fragments, on ...
Janthinoidea is a superfamily of sea snails containing wentletraps (Epitoniidae) and surfing snails (Janthinidae). It includes species that have tethered egg masses, some of which are used for flotation. [1]
J. janthina is a member of the family Janthinidae, snails that trap air bubbles to maintain their positions at the surface of the ocean, where they are predators on hydrozoa. [6] The air bubbles are stabilized by the secretion of amphiphilic mucins which have evolved from epitoniid egg masses. [7]
A species of sea snail in its natural habitat: two individuals of the wentletrap Epidendrium billeeanum with a mass of egg capsules in situ on their food source, a red cup coral. A sea snail Euthria cornea laying eggs. Sea snails are slow-moving marine gastropod molluscs, usually with visible external shells, such as whelk or abalone.
Keen also cited direct observation of a wentletrap feeding by insertion of its proboscis into a sea anemone. A sequence of a wentletrap feeding on an anemone has been published. [7] These snails also prey on corals and other coelenterates. Female wentletraps lay egg capsules that are bound together with a supple string.
Adult S. papulosa release their sperm and eggs into the water, which can take up to 1 hour. [6] Fertilization occurs externally, after which the fertilized egg starts developing. The egg starts forming a larval shell 9-10 hours after fertilization and, around 3 days later, the larvae grow into juvenile sea snails. [4]
Kelletia kelletii, common name Kellet's whelk, is a species of large sea snail, a whelk, a marine gastropod mollusc in the whelk family Austrosiphonidae. [3] [4] [5] [6]Kelletia kelletii is a large scavenger [5] [7] and predatory sea snail commonly found in subtidal kelp forests, rocky reefs, and cobble-sand interfaces at depths ranging from 2 to 70 m from Isla Asunción, Baja California ...
The opposite is sinistral (Latin: sinister, left). This is consistent with the terms for right-handed screws in engineering and physics. Most species of sea snail are dextral. Within a typically dextral species, rare individuals may develop sinistral coiling. In religious usage, the shankha (sacred conch shell) is displayed spire downwards.