Do gastropods have a radula?Asked by: Mr. Leonard Boyer MD
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As in all molluscan groups except the bivalves, gastropods have a firm odontophore at the anterior end of the digestive tract. Generally, this organ supports a broad ribbon (radula) covered with a few to many thousand “teeth” (denticles). ... Radular morphology is an important tool for species identification.View full answer
Correspondingly, What is the radula in a gastropod?
The radula (/ˈrædjʊlə/; plural radulae or radulas) is an anatomical structure used by mollusks for feeding, sometimes compared to a tongue. ... Within the gastropods, the radula is used in feeding by both herbivorous and carnivorous snails and slugs.
One may also ask, What does the radula look like in a gastropod?. As for the radula itself. it is a ribbon-like structure covered with many denticles (tiny teeth). It is movable over the odontophore and is also controlled by muscles. The feeding behavior of marine snails include some that are herbivores, detritus (debris) feeders, scavengers and predatory carnivores.
Beside the above, Do bivalves have a radula?
Bivalves lack a head, radula, and jaws. ... In most bivalves, the mantle pallial cavity contains a pair of very large gills that are used to capture food particles suspended in the inhalant water current. The visceral mass is primarily situated above the pallial cavity and continues ventrally into the foot.
How does Gastropoda eat?
Gastropods feed on very small things. Most of them scrape or brush particles from surfaces of rocks, seaweeds, animals that don't move, and other objects. For feeding, gastropods use a radula, a hard plate that has teeth.
The word gastropod comes from Greek and means “stomach foot,” a name that owes its existence to the unusual anatomy of snails. Snails have a broad flat muscular “foot” used for support and for forward movement.
Predators of land snails include beetles and their larvae, millipedes, flies and their larvae, mites, nematodes, spiders, shrews, mice, squirrels, and other small mammals. Salamanders, toads and turtles as well as many ground foraging birds are also happy to eat large numbers of gastropods.
It deals with six major groups of animals that can be sig- nificant predators of bivalves. They are birds, fish, crabs, starfish and sea urchins, molluscs and flatworms.
Most bivalves live on the bottom in shallow water and bury themselves in sand or mud, with just the edge of their shell showing. Some of them, like oysters and ocean mussels, glue themselves to rocks. A few, like scallops, don't bury themselves, and move around.
Where did they live? Bivalves live on the bottom of rivers, lakes and seas. Some, like scallops, lie on the surface but others burrow beneath it, where they have some protection from predators.
The radula, part of the odontophore, may be protruded, and it is used in drilling holes in prey or in rasping food particles from a surface. It is supported by a cartilage-like mass (the odontophore) and is covered with rows of many small teeth (denticles).
When a food source is located, the snail will begin to feed by first opening its mouth. The protractor muscles move the odontophore forward and the radula comes in contact with the food. The retractor muscle sets bring the odontophore and the radula backwards and the teeth scrape the surface.
It can get itself free because they can twist away because of the muscle power of their foot and it's connected to their shell. How does the first cockle avoid the moon snail? It can kick predators away. ... It burroughs down to get a cockle that is already buried.
The oldest point of a bivalve shell is called the beak, and the raised area around it is known as the umbo (plural umbones). The hinge area is the dorsum or back of the shell. The lower, curved margin is the ventral side.
Cephalopods are thought to be the most intelligent of invertebrates. They have eyes and other senses that rival those of humans. Many cephalopods are active and efficient predators.
Most marine bivalves free spawn, releasing sperm and eggs into the water where fertilization occurs; the larvae then mature as plankton (Atlas of Invertebrate Reproduction and Development).
Clams and their relatives (oysters, scallops, and mussels) are often called bivalves (or bivalved mollusks) because their shell is composed of two parts called valves. Bivalves have a long history.
How do bivalves move? They use their foot to bury themselves in mud or sand, or to get away from predators. ... They are called bivalves because their shell is composed of two parts that are called valves.
Among the most common predators on barnacles are whelks. They are able to grind through the calcareous exoskeletons of barnacles and feed on the softer inside parts. Mussels also prey on barnacle larvae. Another predator on barnacles is the starfish species Pisaster ochraceus.
Many different types of animals feed on clams. Mammals that eat clams include people, bears, walruses, raccoons, and sea otters.
Norovirus is killed at high temperatures but oysters are typically eaten raw. ... The Health Protection Agency found sewage in oysters was most likely to blame. “Oysters harvested from sewage-contaminated waters will feed on the faecal residues,” it said.
Most snails live for two or three years (in cases of land snails), but larger snail species can survive up to 10 years in the wild! In captivity, however, the longest known lifespan of a snail is 25 years, which is the Helix Pomatia.
Vertebrate predators of snails and slugs include shrews, mice, squirrels, and other small mammals; salamanders, toads and turtles, including the uncommon Blandings Turtle Emydoidea blandingii; and birds, especially ground-foragers such as thrushes, grouse, blackbirds, and wild turkey.
And that's pretty much all these snakes can eat. There are now 75 known species of snail-eaters, according to a new study on the reptiles. ... To extract their escargot, the snakes push their lower jaws into the shell and grasp the flesh of the slimy critter with their curved teeth.