Ventral foot mollusk. They retract the foot and effect back-and-forth movements.

Ventral foot mollusk. In shelled mollusks, this foot is usually the same size as the opening of the shell. The foot is the ventral-most organ, whereas the mantle is the limiting dorsal organ. It pulls itself close to rocks for protection. Which of the following statements about the anatomy of a mollusk is false? Mollusks have a radula for scraping food. Although mollusk body forms vary, they share key characteristics, such as a ventral, muscular foot that is typically used for locomotion; the visceral mass, which contains most of the internal organs of the animal; and a dorsal mantle, which is a flap of tissue over the visceral mass that creates a space called the mantle cavity. Mollusks are eucoelomate, but the coelomic cavity is restricted to a cavity around the heart in adult animals. Because of their soft 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. The muscles mainly responsible for movement of the foot are the anterior and posterior pedal retractors. Mollusks are Although mollusk body forms vary, they share key characteristics, such as a ventral, muscular foot that is typically used for locomotion; the visceral mass, which contains most of the internal organs of the animal; and a dorsal mantle, which is a flap of tissue over the visceral mass that creates a space called the mantle cavity. Meaning and Origin of Foot: Phylum Mollusca is characterised by the pronounced development of musculature known as the foot. . The tissue beneath the shell is called the mantle. This organ is quite uncommon and strange to others. Some marine mollusks have a ciliated larval form called a trochophore. 23 There are many species and variations of mollusks; the gastropod mollusk anatomy is shown here, which shares many characteristics common with other groups. Mollusks have ventral nerve cords. It is the locomotory organ in Molluscs. In Gastropoda: The foot in Gastropoda usually has an elongated, flat, ventral sole for creeping. They retract the foot and effect back-and-forth movements. Chitons (Class: Polyplacophora) Chitons have a dorsal shell composed of 8 plates. The mantle cavity Mollusks have a muscular foot used for locomotion and anchorage that varies in shape and function, depending on the type of mollusk under study. The foot is a retractable as well as an extendable organ. … The foot is the ventral-most organ, whereas the mantle is the limiting dorsal organ. The visceral mass is present above the foot, in the visceral hump. One of the largest and most familiar groups of invertebrates, the molluscs are characterized by having a ventral muscular foot, a dorsal fleshy mass containing the viscera and in most species a protective calcareous shell secreted by an underlying mantle layer. The ventral foot and the fleshy parts of the body show extreme modifications among the members of this phylum. In Polyplcophorans: Polyplacophorans like Chiton too have a broad, muscular flat foot on the ventral side that helps the animal to adhere to the substratum and creep. Figure 9. Most mollusks have separate sexes but most snails (gastropods) are hermaphrodites. A ventral foot is used for locomotion and for attachment to rocks. It is regarded as the remnant of the 'dermo-muscular tube' of the ancestral form whose ventral side became greatly developed as an adaptation for creep­ing movement and the Other articles where foot is discussed: bivalve: Locomotion: The bivalve foot, unlike that of gastropods, does not have a flat creeping sole but is bladelike (laterally compressed) and pointed for digging. The mantle cavity develops independently of the coelomic cavity. 4gjhpul ufuosm nhz9r qdse mn5jk fskjduo evxd yr zirwm dfina