There are many different oceanic mollusks, such as clams, octopus and oysters, but there are also mollusks that live on land, such as snails and slugs. Mollusks are the second largest group of invertebrates in the world, with somewhere between 50,000 and 200,000 living species.Continue Reading
Mollusks can be separated into a number of smaller categories, such as univalve, bivalve and cephalopods. Cephalopods are a group that contains cuttlefish, squid and octopus. Univalve mollusks are those that only have one shell, such as snails, while bivalve mollusks are those with two connecting shells. Virtually all univalves have a protective shell, which grows in a spiral pattern. The only exception is slugs, which are also considered univalve despite the fact that they have lost the ability to grow a shell through evolution.
Examples of bivalve mollusks include scallops and clams. Although snails are technically univalve, they actually belong to the group known as gastropods, which also includes both sea and land slugs, limpets, sea cucumbers and sea hares. Both univalve and bivalve mollusks are often prized for their extraordinary shells. Basically all shells that are found on beaches across the world come from some species of mollusk. Some of the most prized mollusk shells include conch, cowrie and whelk, which are all univalve gastropods.Learn more about Marine Life
Cuttlefish, squid, snails and scallops are molluscs, as are clams, sea hares, nudibranchs, mussels, oysters and limpets. As of 2015, there are roughly 100,000 existing mollusc species, which makes them the second-largest phylum of animals, following arthropods.Full Answer >
Sea slugs, snails, crabs, sea stars and some fish species, including mosshead sculpins, eels, flounders and butterflyfish, eat sea anemones. Predators with thick protective coverings, such as crustaceans, seem to be resistant to the anemones' toxin-producing nematocysts, which form anemones' main defense mechanism.Full Answer >
Seashells are exoskeletons of marine invertebrates such as mollusks and sea snails, and they grow from the inside out or by depositing new material at the edges, according to Scientific American. Two common types of seashells are bivalves and gastropod shells. The former are made by mollusks such as oysters and clams. The latter are exoskeletons of marine snails.Full Answer >
Lobsters eat fish, worms, mollusks, other crustaceans, plants, sea urchins and snails. They are omnivores, meaning they consume both plant and animal life. Lobsters prefer to hunt and eat live prey but do scour the ocean floor for dead sea creatures when necessary. Some deep-sea lobsters scavenge for large, dead animals such as whales.Full Answer >