mantle, in biology, soft covering, formed from the body wall, of brachiopods and mollusks; also, the fleshy outer covering, sometimes strengthened by calcified plates, of barnacles. The mantle of mollusks and brachiopods secretes the shell in species that possess shells.

2022年7月31日 · The dorsal epidermis in mollusks is modified to form the mantle, which encloses the mantle cavity and visceral organs. This cavity is quite distinct from the coelomic cavity, which in the adult animal surrounds the heart.

The dorsal epidermis in mollusks is modified to form the mantle, which encloses the mantle cavity and visceral organs. This cavity is quite distinct from the coelomic cavity, which in the adult animal surrounds the heart.

Dorsally the body wall is the mantle and a fold of this body wall forms and encloses that all important molluscan chamber, the mantle cavity. The mantle cavity is filled with water or air and in it are located the gill (s), anus, nephridiopore (s) and gonopore (s).

2024年3月11日 · Invertebrates are the largest group of animals in the animal kingdom having no vertebral column or backbone. They are the most diversified group of animals living on land like insects, spiders, and worms, or in water like marine crustaceans. They do not have an endoskeleton but have an exoskeleton to support and protect the body.

2022年2月24日 · The mantle of a mollusk forms the external layer of its body and, therefore, encloses the set of internal organs that form the visceral mass. It is a fabric made up of three folds or layers. The outer layer produces the material that forms the shell in some mollusks, the intermediate layer is generally sensory, while the inner layer is muscular.

The mantle, which secretes the shell, drapes over the visceral mass and creates a water-filled chamber, the mantle cavity, with gills, anus, and excretory pores. Many molluscs feed by using a straplike rasping organ, a radula, to scrape up food.

B. Phylum Chordata: the chordates include two invertebrate subphyla and all vertebrates OBJECTIVES After reading this chapter and attending lecture, the student should be able to: l. From a diagram, identif, the parts of a sponge and describe the function of each

Overlying the visceral mass is a fold of tissue called the mantle; within the cavity formed by the mantle are respiratory structures called gills, that typically fold over the visceral mass. The mouths of most mollusks, except bivalves (e.g., clams) contain a specialized feeding organ called a radula , an abrasive tonguelike structure.

2024年9月13日 · This phylum possesses a body plan typically divided into the foot, visceral mass, and mantle. The evolution of the coiled shell in gastropods contrasts starkly with the streamlined bodies of cephalopods, which have eliminated the external shell …