The basic structure of a molluscs?

The basic body structure, consisting of a foot, visceral mass, and mantle, is similar in most mollusks. The foot is located below the visceral mass. The external shell consists of three layers. The thin outer layer, called the periostracum, is made of a tough hornlike material and serves to protect the lower layers.

1. What structure is found only in molluscs?
2. What is the unique structure to molluscs?
3. What are 3 structures that all molluscs possess?
4. What structures do all molluscs have in common?
5. Which type of larva is found in Mollusca?
6. What are the 5 main classes of Mollusca?
7. What three characteristics do all molluscs share that make them molluscs?
8. What are the characteristics of Mollusca that distinguish it from other phyla?
9. How does the phylum Mollusca move?
10. What adaptations do molluscs have?
11. What is mantle cavity in molluscs?
12. Does a Mollusca have a shell?
13. What four features are present in all molluscs?
14. Do molluscs have a larval stage?
15. Is Mollusca Oviparous or viviparous?
16. Do molluscs have trochophore larvae?

What structure is found only in molluscs?

There are also two unusual organs that are found exclusively in mollusks: the mantle and the radula. ... The following organ systems are also shown: circulatory and respiratory systems, digestive system, nervous system, excretory system, and reproductive system.

What is the unique structure to molluscs?

All molluscs also have gills, a mouth and an anus. A feature unique to molluscs is a file-like rasping tool called a radula. This structure allows them to scrape algae and other food off rocks and even to drill through the shell of prey or catch fish.

What are 3 structures that all molluscs possess?

The three most universal features defining modern molluscs are a mantle with a significant cavity used for breathing and excretion, the presence of a radula (except for bivalves), and the structure of the nervous system.

What structures do all molluscs have in common?

WHAT FEATURES DO MOLLUSKS HAVE IN COMMON? As well as a shell, most mollusks have a muscular foot for creeping or burrowing. Some also have a head with sense organs. The soft body includes lungs or gills for breathing, and digestive and reproductive parts, all enclosed by a skinlike organ called the mantle.

Which type of larva is found in Mollusca?

veliger, larva typical of certain mollusks such as marine snails and bivalves and a few freshwater bivalves. The veliger develops from the trochophore (q.v.) larva and has large, ciliated lobes (velum).

What are the 5 main classes of Mollusca?

The Phylum Mollusca consist of 8 classes: 1) the Monoplacophora discovered in 1977; 2) the worm-like Aplacophora or solenogasters of the deep sea; 3) the also worm-like Caudofoveata; 4) the Polyplacophora, or chitons; 5) the Pelecypoda or bivalves; 6) the Gastropoda or snails; 7) the Scaphopoda, or tusk shells; and 8) ...

What three characteristics do all molluscs share that make them molluscs?

Main characteristics of Mollusca :

There are three distinct body zones: a head-foot, a visceral mass and a mantle.

What are the characteristics of Mollusca that distinguish it from other phyla?

Molluscs have a mantle or mass of soft flesh that covers the soft body and encloses the internal organs. In many species, the mantle produces a hard shell. Not all molluscs produce a shell. Many molluscs have a radula, which, in most species, is a rasp-like scraping organ used in feeding (Fig.

How does the phylum Mollusca move?

Most mollusks move with a muscular structure called a foot. The feet of different kinds of mollusks are adapted for different uses, like crawling, digging, or catching prey.

What adaptations do molluscs have?

The subclass Coleoidea, which includes squid, cuttlefish and octopus, have a number of other unique adaptations among the molluscs. They have highly developed eyes, a complex nervous system, ink glands and skin cells with the ability to change color (known as chromatophores).

What is mantle cavity in molluscs?

The mantle cavity is a central feature of molluscan biology. This cavity is formed by the mantle skirt, a double fold of mantle which encloses a water space. This space contains the mollusk's gills, anus, osphradium, nephridiopores, and gonopores. The mantle cavity functions as a respiratory chamber in most mollusks.

Does a Mollusca have a shell?

mollusk, also spelled mollusc, any soft-bodied invertebrate of the phylum Mollusca, usually wholly or partly enclosed in a calcium carbonate shell secreted by a soft mantle covering the body.

What four features are present in all molluscs?

All mollusks have a visceral mass, a mantle, and a foot. The visceral mass contains the digestive, excretory, and reproductive organs. The mantle is a covering. It may secrete a shell.

Do molluscs have a larval stage?

Unlike echinoderms, molluscs do not have a larval body separate from the juvenile/adult body; mollus- can larvae have only transient larval traits.

Is Mollusca Oviparous or viviparous?

Birds, reptiles, amphibians, most fish, insects, mollusks, arachnids, and monotremes are oviparous animals. Most mammals are viviparous animals.

Do molluscs have trochophore larvae?

trochophore, also called trochosphere, small, translucent, free-swimming larva characteristic of marine annelids and most groups of mollusks. ... In some mollusks (such as gastropods and bivalves), the trochophore develops into a second stage, the veliger (q.v.), before metamorphosing to adult form.