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Cephalopods are thought to be unable to live in fresh water due to multiple biochemical constraints, and in their >400 million year existence have never ventured into fully freshwater habitats. [10] 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]
The cephalopods have a long geological history, with the first nautiloids found in late Cambrian strata. [1]The class developed during the middle Cambrian, and underwent pulses of diversification during the Ordovician period [2] to become diverse and dominant in the Paleozoic and Mesozoic seas.
A cephalopod is any member of the biological order Cephalopoda, the group that contains all squid, octopuses, and cuttlefish. This category covers articles about cephalopods as individual species or groups.
Cephalopod include octopus, squid and cuttlefish. They are found in all oceans, and neurologically are the most advanced of the invertebrates. [59] About 800 living species of marine cephalopods have been identified, [60] and an estimated 11,000 extinct taxa have been described. [61] There are no fully freshwater cephalopods. [62]
Pages in category "Cephalopods and humans" This category contains only the following page. This list may not reflect recent changes. A. Cephalopod attack
Cephalopods are very abundant and are larger in size than those found in the Kope Formation, because of the increase in food availability for these predators following the late Cambrian. [2] Cephalopods survived well in this time period because they were able to prey on the many gastropods and mollusks that are also found in this formation. [2]
Drawing of the statocyst system Statocysts (ss) and statolith (sl) inside the head of sea snail Gigantopelta chessoia. The statocyst is a balance sensory receptor present in some aquatic invertebrates, including bivalves, [1] cnidarians, [2] ctenophorans, [3] echinoderms, [4] cephalopods, [5] [6] crustaceans, [7] and gastropods, [8] A similar structure is also found in Xenoturbella. [9]
Seafood is any form of sea life regarded as food by humans, prominently including fish and shellfish.Shellfish include various species of molluscs (e.g., bivalve molluscs such as clams, oysters, and mussels, and cephalopods such as octopus and squid), crustaceans (e.g. shrimp, crabs, and lobster), and echinoderms (e.g. sea cucumbers and sea urchins).