Animalscaretips
The radula (UK: /ˈrædjʊlə/, US: /ˈrædʒʊlə/; plural radulae or radulas) is an anatomical structure used by mollusks for feeding, sometimes compared to a tongue. ... It is a minutely toothed, chitinous ribbon, which is typically used for scraping or cutting food before the food enters the esophagus.
- What is the mollusc's rasping tongue called?
- Are Chitons Cephalized?
- What is visceral mask?
- What gastropod means?
- Which of these is a bivalve?
- What are the 4 major molluscs?
- What does a Mollusca eat?
- What are the 3 main mollusks?
- What do Chitons look like?
- Are all mollusks cephalized?
- Are annelids cephalized?
- Do all molluscs have eyes?
- What is Incurrent siphon?
- What do molluscs use for locomotion?
What is the mollusc's rasping tongue called?
You won't find a radula anywhere in the human body, but it's a common anatomical feature among animal species in phylum Mollusca. Biologists describe it as a rasping dental ribbon that replaces the tongue found in mammals. Oysters, clams and other bivalves are the only mollusks that lack this organ.
Are Chitons Cephalized?
The ancestral mollusc probably resembled a chiton, a flattened worm like animal protected by a dorsal shell. ... Both flatworms and molluscs are triploblastic, bilaterally symmetric, and cephalized.
What is visceral mask?
The visceral hump, or visceral mass, of gastropods is always contained within the shell; it generally holds the bulk of the digestive, reproductive, excretory, and respiratory systems. A significant part of the visceral hump consists of the mantle, or pallial, cavity.
What gastropod means?
Definition of gastropod
: any of a large class (Gastropoda) of mollusks (such as snails and slugs) usually with a univalve shell or none and a distinct head bearing sensory organs.
Which of these is a bivalve?
The correct option is a) clam. Clams are called bivalves as their shell are also divided into two equal parts and connected by two adductor muscles.
What are the 4 major molluscs?
The five classes are Polyplacophora, Gastropoda, Bivalvia, Scaphopoda and Cephalopoda. The major diversity of species found from two classes namely Gastropoda and bivalvia.
What does a Mollusca eat?
Most molluscs are herbivorous, grazing on algae or filter feeders. For those grazing, two feeding strategies are predominant. Some feed on microscopic, filamentous algae, often using their radula as a 'rake' to comb up filaments from the sea floor.
What are the 3 main mollusks?
The three major groups of mollusks are gastropods, bivalves, and cephalopods (SEF ul o pods). The largest group is the gastropods. These are mollusks like snails and slugs that have just one shell or no shell at all. Gastropods creep along on their broad foot.
What do Chitons look like?
Chitons are usually oval in shape. ... Chitons use a large, flat foot for creeping along and clinging to rocks; they also have a well-developed radula (filelike structure) with which to scrape algae and other plant food from rocks.
Are all mollusks cephalized?
Mollusks represent another group in which cephalization has been lost and regained. For example, bivalves are not particularly cephalized (although some scientists have argued that they are "all head"). However, as with the echinoderms, certain mollusks regained cephalization.
Are annelids cephalized?
Nematodes have an anterior neural ring connected to two neural cords, a ventral and a dorsal one, whereas in planaria (platyhelminthes) there are only two small anterior “cerebral” ganglia from which neural cords split. Therefore, cephalization in annelids is greater than in nematodes or in flatworms.
Do all molluscs have eyes?
Diversity. There are between seven and eleven distinct eye types in molluscs. Molluscs have eyes of all levels of complexity, from the pit eyes of many gastropods, to the pinhole eyes of the Nautilus, to the lensed eyes of the other cephalopods.
What is Incurrent siphon?
Many bivalves have two tubes, or siphons, extending from the rear end: one (the incurrent siphon) for the intake of oxygenated water and food and one (the excurrent siphon) for the outflow of waste products. ... As water passes over the gills, tiny organic particles are strained out and are carried to the mouth.
What do molluscs use for locomotion?
Mollusks have a muscular foot, which is used for locomotion and anchorage, and varies in shape and function, depending on the type of mollusk under study. In shelled mollusks, this foot is usually the same size as the opening of the shell. The foot is a retractable as well as an extendable organ.
