Marine Biology - Phylum Mollusca

All Molluscs have what?

Soft Body

Describe 5 characteristics of members of this phylum including: (symmetry, general body description, something unique to mollusks, how they breath)

Bilateral symmetry, Visceral mass, head-foot, gills, nervous system / brain, calcium carbonate shell

Mantle

Thin layer of tissue that makes shell

Foot

Used for movement

Radula

Set of teeth used for feeding

Visceral Mass

Intestines

Operculum

Trapdoor that keeps animals in shell

Chromatophore

Color changing cells

Byssal Thread

Used by Mussels, attach to rocks

What occurs in the Visceral Mass?

Respiration, Digestion, Nervous System, Circulatory System

What occurs in the Head?

Sight

What occurs in the foot?

Locomotion

What does Gastropod mean?

Stomach Foot

List the major kinds of gastropods, what else are they referred to as?

Snails, Limpets, Abalones, NUdibranchs, Whelks, Cone Snails, Univalves

How do nudibranchs differ from other Gastropods?

Shell-less

What unique defense mechanism do nudibranchs have?

Brightly colored, can consume and incorporate other animals defense mechanisms

Bivalve means?

2 shells

List the five kinds of bivalves we discussed and how they move about

Clams: Foot

Mussels: Byssal Thread

Shipworm: Burrow through wood

Scallops: Jet propulsion

Oysters: Cement to ground

What structures are Bivalves missing?

Head and Radula

How do Bivalves feed?

Filter feeding

How do Bivalves reproduce?

External Fertilization

What is the function of each of the following clam parts:

Incurrent siphon

Take in food, water and oxygen

What is the function of each of the following clam parts:

Excurrent siphon

Let out waste

Gills

Extract Oxygen, secrete mucus to trap food

Adductor Mussels

Open and close shells

cephalopod meaning?

Head-foot

Examples of Cephalopods?

Squid, octopus, cuttlefish, chambered nautilus

Cephalopods have complex and well developed what?

Brain and Eyes

What animals have poisonous saliva?

Squid and Octopus

The fused head and thorax is referred to as

cephalothorax

Define or describe the function of each of the following squid parts:

Dioecious

Having separate sexes

Define or describe the function of each of the following squid parts:

Siphon

Water jet allows movement

Define or describe the function of each of the following squid parts:

Ink Gland

Protection and Defense

Define or describe the function of each of the following squid parts:

Arms

Covered in suckers for eating

Define or describe the function of each of the following squid parts:

Tentacles

Suckers only at end, used for protection

Define or describe the function of each of the following squid parts:

Fins

movement

Define or describe the function of each of the following squid parts:

Beak

Biting

Define or describe the function of each of the following squid parts:

Pen

Remnant of shell

Used to produce purple dye

Whelk

Used by Native Americans as wampum

Quahog clam

Has dozens of bright blue eyes

Scallop

Largest class

Gastropod

Most advanced class

Cephalopod