Amalda
Amalda is a genus of small, predatory sea snails, marine gastropod mollusks in the family Olividae, the olives. They are commonly known as “olive shells” or “dwarf olives.” These snails are typically found in shallow water, often buried in sand or under rocks. Their smooth, glossy shells range in color from white to brown and black, often with intricate patterns and color variations. They are carnivores, feeding on other mollusks, worms, and small crustaceans.
Characteristics
Amalda snails possess several distinctive features that distinguish them from other olive shells. The shell is generally elongated and spindle-shaped, with a pointed apex and a slightly expanded aperture. They exhibit a noticeable siphonal canal, a narrow tube-like structure extending from the aperture. The surface of the shell is smooth and polished, often displaying intricate patterns of color bands and spots. The operculum, a small, horny plate covering the aperture when the animal retracts, is thin and flexible, unlike the thick, calcareous opercula of other olives. These snails are known for their relatively small size, with most species measuring less than 20 millimeters in length.
Habitat and Distribution
Amalda snails are found in a wide range of marine habitats, primarily in shallow waters along the coasts of the Indo-Pacific region. They are commonly found on sandy bottoms, under rocks, and in seagrass beds. Some species are also known to inhabit coral reefs and intertidal zones. Amalda snails are often found in association with other invertebrates, including worms, crustaceans, and other mollusks.
Feeding Habits
Like all olives, Amalda snails are predatory carnivores. They use a combination of a radula, a rasping tongue covered in teeth, and a proboscis, a long, flexible tube, to capture and consume their prey. They primarily feed on other mollusks, worms, and small crustaceans, but may also scavenge on dead animals. Some species are known to be highly specialized feeders, targeting specific prey items.
Reproduction
Amalda snails reproduce by laying egg capsules, often attached to rocks or other hard surfaces. The capsules contain multiple eggs, and the developing embryos feed on a yolk sac until they hatch as miniature versions of the adult snails.
References
The following resources provide further information on Amalda snails: