Do mollusks have symmetry?

Do mollusks have symmetry?

Mollusks have bilateral symmetry. – The two halves of the body mirror each other. Gastropods (snails) ~ eat with a radula (tiny tongue covered with teeth.

What type of symmetry is found in mollusks?

Mollusks are generally considered a phylum of bilaterally symmetrical animals, although there are also many asymmetrical species. Bilateral symmetry means that an organism can only be divided into two equal halves if it is cut from top to bottom along the middle of the anterior-posterior (front-back) axis.

Do molluscs have radial symmetry?

Mollusks have radial symmetry. Mollusks have joined appendages. Mollusks have a muscular foot. Arthropods have radial symmetry.

Is Mollusca asymmetrical?

Animals in class Gastropoda (“stomach foot”) include well-known mollusks like snails, slugs, conchs, sea hares, and sea butterflies. Gastropoda includes shell-bearing species as well as species with a reduced shell. These animals are asymmetrical and usually present a coiled shell.

Are Mollusca bilaterally symmetrical?

Mollusca can be found in freshwater, marine and terrestrial habitats. More features of molluscs include bilateral symmetry, soft or unsegmented bodies, respiration via ctenidium, ganglia/nerve comprised nervous system, haemocoel body cavity, etc.

What type of symmetry do Pelecypods have?

Any aquatic mollusk belonging to the class Pelecypoda (phylum Mollusca), which includes clams, mussels, scallops, and oysters. Pelecypods have two symmetrical calcareous shells, called right and left valves, that are joined by a hinge. Pelecypods are also known as bivalves because of this bilateral symmetry.

Is Chordata symmetrical?

Chordates, including humans, are also all classified as having bilateral symmetry and can be divided into a left and right side.

Do mollusks have a complete digestive system?

Clams (and all mollusks) have a complete digestive system. It consists of a mouth where food is ingested, a short connecting tube called the esophogus, a stomach which temporarily holds food, and an intestine where food digestion and absorption takes place. Food is distributed to the cells of the body by blood.

What kind of symmetry do sponges have?

radially symmetrical
Sponges are unsymmetrical or radially symmetrical, with many cell types but no distinct tissues; their bodies contain numerous pores and sharp protective spicules. Coelenterates (phylum Cnidaria) are radially symmetrical, with two tissue layers (ectoderm and endoderm) surrounding an all-purpose gastrovascular cavity.

In which class of Mollusca bilateral symmetry is absent?

Echinodermata is the class of phylum mollusca, the larvae are bilaterally symmetrical but the symmetry is lost in adults.

Do scallops have bilateral symmetry?

Scallops are common marine bivalves in much of the fossil record and in the modern oceans. Individual bivalve shells, unlike brachiopod shells, are asymmetrical. Scallop shells sometimes approach bilateral symmetry, but the subtriangular, wing-like auricles along the hingeline will still display asymmetry.

What is one difference between pelecypods and brachiopods?

The key difference between brachiopods and pelecypods is in their respective symmetries. Pelecypods have a line of symmetry along their hinge line. Brachiopods, however, have their line of symmetry normal, or perpendicular, to their hinge line.