Mollusca and Annelids
... • Hard shells • Eggs are released into water in cases by most, some tend their eggs and then die • Also feed in plankton cloud • Mostly swim and use tentacles for hunting • Eight arms, two tentacles • Can be much larger than octopuses, one has been measured at 59 feet in length ...
... • Hard shells • Eggs are released into water in cases by most, some tend their eggs and then die • Also feed in plankton cloud • Mostly swim and use tentacles for hunting • Eight arms, two tentacles • Can be much larger than octopuses, one has been measured at 59 feet in length ...
Phylum Mollusca - SD43 Teacher Sites
... • Held together by one or two powerful muscles • Most are sessile • Clams, oysters, mussels, scallops ...
... • Held together by one or two powerful muscles • Most are sessile • Clams, oysters, mussels, scallops ...
What is a Mollusk?
... mouth) and radula (teeth), well developed tentacles (for finding food), and a pair of eyes that enable them to detect light and dark. The shell encloses the mantle cavity. Gastropods may burrow, crawl, swim, float, or be sedentary. Gastropod feeding habits are extremely varied and include grazers on ...
... mouth) and radula (teeth), well developed tentacles (for finding food), and a pair of eyes that enable them to detect light and dark. The shell encloses the mantle cavity. Gastropods may burrow, crawl, swim, float, or be sedentary. Gastropod feeding habits are extremely varied and include grazers on ...
Phylum Mollusca
... Mollusk – slugs, snails, octopus, squid, clam, oyster 50,000 living mollusk species and about 35,000 fossil species. The number of known species is second only to the Phylum Arthropoda. ...
... Mollusk – slugs, snails, octopus, squid, clam, oyster 50,000 living mollusk species and about 35,000 fossil species. The number of known species is second only to the Phylum Arthropoda. ...
Seashell
A seashell or sea shell, also known simply as a shell, is a hard, protective outer layer created by an animal that lives in the sea. The shell is part of the body of the animal. Empty seashells are often found washed up on beaches by beachcombers. The shells are empty because the animal has died and the soft parts have been eaten by another animal or have rotted out.The term seashell usually refers to the exoskeleton of an invertebrate (an animal without a backbone). Most shells that are found on beaches are the shells of marine mollusks, partly because many of these shells endure better than other seashells.Apart from mollusk shells, other shells that can be found on beaches are those of barnacles, horseshoe crabs and brachiopods. Marine annelid worms in the family Serpulidae create shells which are tubes made of calcium carbonate that are cemented onto other surfaces. The shells of sea urchins are called tests, and the moulted shells of crabs and lobsters are called exuviae. While most seashells are external, some cephalopods have internal shells.Seashells have been used by humans for many different purposes throughout history and pre-history. However, seashells are not the only kind of shells; in various habitats, there are shells from freshwater animals such as freshwater mussels and freshwater snails, and shells of land snails.