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Molluscs are a large phylum of invertebrate animals, many of which have shells. Edible molluscs are harvested from saltwater, freshwater, and the land, and include numerous members of the classes Gastropoda (snails), Bivalvia (clams, scallops, oysters etc.), Cephalopoda (octopus and squid), and Polyplacophora (chitons).
They eat small crustaceans, including crabs, hermit crabs, shrimp, and other small sea animals. They are one of the world's most venomous marine animals. [ 3 ] Despite their small size—12 to 20 cm (5 to 8 in)—and relatively docile nature, they are very dangerous if provoked when handled because their venom contains a powerful neurotoxin ...
Cuttlefish eat small molluscs, crabs, shrimp, fish, octopuses, worms, and other cuttlefish. Their predators include dolphins, larger fish (including sharks), seals, seabirds, and other cuttlefish. The typical life expectancy of a cuttlefish is about 1–2 years. Studies are said to indicate cuttlefish to be among the most intelligent ...
After investigating reef sharks, tiger sharks, and the giant Pacific octopus, Wade settles on a large octopus being the most likely culprit for being the lusca monster. [2] A Caribbean Film Festival, Lusca Fantastic Film Fest, was named after this sea monster; the festival is an annual event held in Puerto Rico. It is the first and only ...
Sometimes the octopus catches more prey than it can eat, and the den is often surrounded by a midden of dead and uneaten food items. Other creatures, such as fish, crabs, molluscs and echinoderms, often share the den with the octopus, either because they have arrived as scavengers, or because they have survived capture. [86]
Cephalopods occupy most of the depth of the ocean, from the abyssal plains to the sea surface, and have also been found in the hadal zone. [11] Their diversity is greatest near the equator (~40 species retrieved in nets at 11°N by a diversity study) and decreases towards the poles (~5 species captured at 60°N). [12]
These ornate curved white eggcases are occasionally found floating on the sea, sometimes with the female argonaut clinging to it. It is not made of aragonite as most other shells are, but of calcite , with a three-layered structure [ 7 ] and a higher proportion of magnesium carbonate (7%) than other cephalopod shells.
The arm crown of modern nautilids (genera Nautilus and Allonautilus) is very distinct in comparison to coleoids.Unlike the ten-armed Decabrachia or the eight-armed Octopodiformes, nautilus may possess any number of tentacles (cirri) from 50 to over 90 tentacles depending on the sex and individual.