Kingdom Animalia- MOLLUSCA Protostome Coelomate Animals BIO102

PHYLUM MOLLUSCA

Phylum Mollusca

Phylum in which organisms are...

-Mostly aquatic, few are terrestrial

-Billaterally symmetrical

-Motile as adults

-Triploblastic

-Coelomate

-Protostomes

-Have a muscular foot and a mantle

Bilateral

What is Phylum Mollusca’s symmetry?

Motile

Phylum Mollusca is _____ as adults.

Ectoderm mesoderm endoderm

Phylum Mollusca is triploblastic, which means they have ____, _____, _____.

true mesoderm coelomate

Phylum Mollusca has a ____ body cavity with organs lined by _____. This is called _______.

spiral and determinate cleavage, schizocoelous, mouth blastopore

Protosome definition

solid masses of mesoderm split to form coelom

Schizocoelous definition

Mollusca

Phylum ___________ contains chitons, snails, slugs, bivalves, squid, and octopuses

Mantle, Muscular foot

The two major characteristics that all mollusks have are... (alphabetical order)

Muscular foot

Muscle tissue specialized for movement in mollusks

Mantle

A tissue that either acts as a body covering or lines the inside of the shell in mollusks.

calcium carbonate

In shelled mollusks, the mantle secretes ___________ ___________ to enlarge the shell.

restricted winter growth

The ridges on the shell of a bivalve represent periods of...

shell

All mollusks except slugs and octopuses have a ________ of calcium carbonate

Visceral mass

Some mollusks have a __________ __________: a mass of interconnected body organs

Radula

Some mollusks have __________: teeth-like structures of calcium carbonate used for scraping or grinding

Gills, lungs

Aquatic mollusks have ________ while terrestrial mollusks have ________, both of which are true respitory organs.

Mollusks

The first phylum of animals to have a circulatory system are the...

open circulatory system

Most mollusks have a(n) __________ _________ _________ in which blood circulates through vessels that release into a hemocoel, then re-enters the heart through ostia.

hemocoel

The ____________ is the cavity in which blood collects within an open circulatory system.

ostia

In an open circulatory system, blood re-enters the heart through small holes in the heart called...

closed circulatory system

Cephalopod mollusks have a(n) _________ _________ _________ in which blood only travels through the heart and blood vessels. There is no cavity where blood collects or holes in the heart.

trochophore

Most mollusks, annelid worms, and arthropods produce a ______________ larval stage

cilia

Trochophore larva possess _______ in tufts at the ends as well as in a belt around the middle, which allows it to be motile.

Bivalvia, Cephalopoda, Gastropoda, Polyplacophora

The classes of Phylum Mollusca are... (alphabetical order)

Playful Big Giant Cats

acronym

Polyplacophora

Chitons make up Class...

8 flexible interlocking plates

All organisms of Class Polyplacophora possess a shell consisting of...

radula, muscular foot, gills

All organisms of Class Polyplacophora possess _________ within their sucker-like mouths for scraping, a broad _________ _________, and _________ that run along each side.

Bivalvia

Class ___________ contains clams, mussels, scallops, and oysters

two shells

All bivalves posses ______ ______ that enclose the body

filter-feed

Bivalves ______-______ by drawing water into their bodies for nutrition and respiration

gills, radula

Bivalves possess _________ but lack _________

Limited

Bivalves have _________ cephalization

Gastropoda

Class ___________ contains snails and slugs

snails, slugs

In Class Gastropoda, __________ possess a shell while ________ lack a shell

radula, cephalization

Gastropods possess __________ for scraping and exhibit _____________ by having obvious heads with antennae

terrestrial

Gastropods are the only mollusks to have any _____________ species.

Cephalopoda

Class ____________ contains octopuses, squid (and cuttlefish), and chambered nautilus

head, eyes

Cephalopods are the most cephalized mollusks because they have an obvious _______ with _______.

closed, muscular foot

Cephalopods have a _________ circulatory system and a __________ __________ divided into arms and/or tentacles

shell

Octopuses lack a...

internal

Squid have an ___________ shell

external

Chambered Nautilus have an _________ shell