Mollusks

Trochophore larvae:

Are found in molluscan life cycles, Possess a belt of cilia around their bodies, occur in annelid life cycles.

"Jet propulsion" is the usual means of locomotion in water for

Cephalopods

The only mollusks that have a closed circulatory system are

Cephalopods

What does the cilia of a trochophore larva do?

Creates currents for drawing in food

True or False: Due to the presence of a shell, all gastropods are capable of living on land for at least a portion of their lives.

False

True or False: Mollusks have four distinct body parts: a foot, a head, a visceral mass, and a tail.

False

True or False: Mollusks must eat constantly because the functioning of their nephridia causes the disposal of useful molecules as well as of waste products.

False

True or False: Since cephalopods have tentacles, they have no need for a radula.

False

3 main Classes of Phylum Mollusca

Gastropods, Bivalves, Cephalopods

Nautilidae, Cephalopoda

Identify the creature and its class

Octopus, Cephalopoda

Identify the creature and its class

Scallop, Bivalvia

Identify the creature and its class

Snail, Gastropoda

Identify the creature and its class

Shells of mollusks:

May consist of one or more pieces, allow for the attachment of muscles, and provide protection.

True or False: In terrestrial snails, the mantle cavity functions as a simple lung.

True

True or False: Most bivalves have separate sexes, but some are hermaphroditic

True

True or Flase: Unlike arthropods, mollusks are unsegmented; instead, they are divided into three regions.

True

What are the characteristics of mollusks?

complete digestive tract, bilateral symmetry, and an open circulatory system

A characteristic structure found in many mollusks is the radula, which is involved in

eating

Adductor muscles are responsible for

moving the valves of bivalves