Readers ask: Why Are Mussels Bilateral But Dont Have Cephalization?

Why are mussels not Cephalized?

Instead, they wait for food to come to them. Their body shape lets them get food from any direction. But eventually, some worm-like animals evolved bilateral symmetry [“bye-LAT-eral”]. In contrast, animals with radial symmetry are not cephalized: They have no head, just a mouth in the middle.

Do mussels have bilateral symmetry?

Their body shape lets them collect food from any direction. Eventually, though, a line of worm-like animals evolved bilateral symmetry, with a body bearing two sides – left versus right – that are mirror images of each other. They can forage for food, track live prey, seek better habitat, or search for a mate.

Is bilateral symmetry associated with Cephalization?

Cephalization is associated with bilateral symmetry and movement with the head facing forward.

Why is bilateral symmetry associated with Cephalization?

Cephalization: Cephalization occurs in all bilaterally symmetrical animals because there is an advantage in having the end that goes first, as the animal moves, fitted out with sense organs—on the premise that it is better to know where you are going than where you have been.

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Do mussels have a digestive system?

Internal organ systems include an open circulatory system powered by a heart; a digestive system that consists of mouth, stomach, gut, and anus; a decentralized nervous system that controls movement of the foot and adductor muscles; and reproductive organs that usually occur separately in male and female mussels.

Do mussels have a nervous system?

Supporters of vegan bivalve eating claim mussels and oysters cannot respond to stimuli simply because their reaction to it doesn’t stem from a central nervous system while ignoring the fact that they do have a nervous system.

What kind of symmetry do mussels have?

Bilateral symmetry is a feature of mussel bivalves as well as the mother-of-pearl appearance on the inside of the shell. Taxonomists refer to bivalves as having bilateral symmetry where the shells are mirror opposites of one another.

Does a scallop 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 the definition of bilateral symmetry?

: symmetry in which similar anatomical parts are arranged on opposite sides of a median axis so that only one plane can divide the individual into essentially identical halves.

What is Cephalization in bilateral symmetry?

Cephalization is an evolutionary trend in which, over many generations, the mouth, sense organs, and nerve ganglia become concentrated at the front end of an animal, producing a head region. This is associated with movement and bilateral symmetry, such that the animal has a definite head end.

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Do all bilateral animals have Cephalization?

Although cephalization is associated primarily with bilaterally symmetrical species, even some of the more primitive, radially symmetrical animals show some degree of cephalization. Cephalization evolved several times within the animal kingdom, suggesting that it offers certain inherent advantages.

Do the crustaceans have a complete or incomplete gut?

They have a complete digestive system and their mouth is on their underside. Arthropods (Phylum Arthropoda) include insects, spiders, and crustaceans.

What are the advantages of bilateral symmetry?

The advantages of bilateral symmetry include the formation of a head and tail region, where the head region can house a detailed nervous system, and more directional movement to include the ability to move straight forward.

Where are the sense organs located in most animals with bilateral symmetry?

Sense organs around the front end or head help bilaterally symmetrical animals find food. Bilateral symmetry also helps animals avoid enemies.

What do you notice about the shape of flatworms How is this shape beneficial?

What do you notice about the shape of flatworms? How is this shape beneficial? Their shape allows the species to survive without a circulation system to deliver oxygen and remove waste from cells throughout the body.

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