MOLLUSKS & ECHINODERMS

PHYLUM - __________________

Mollusk = "__________________"

Vary from tiny snails to the giant __________________ that grows over 60 feet long.

May be used as food, ornaments, and money.

Characteristics:

1. __________________ symmetry

2. True __________________

3. 3 body parts:

• __________________ - contains mouth, sensory organs, foot (and other motor organs), radula (a
• toothed scraping organ)
• __________________ hump - contains organ systems
• __________________ - a thin membrane over the visceral mass

4. __________________ larval stage

Class - __________________ (hatchet foot)

Clams, __________________, Oysters, __________________

Also called __________________ (two shells)

CLAMS - live in salt water, in the sand

Shells are made of __________________ carbonate that forms 3 layers. The inner layer forms a smooth shiny layer called the __________________ layer. They are filter feeders, filtering food and oxygen from the water that comes in through __________________ siphons and goes out through __________________ siphons.

Open Circulatory system - blood collects in open pools called __________________.

Most have separate sexes that shed sperm and eggs into the water, where fertilization takes place.

__________________ are similar to clams but have many eyes that sense light and can move by squirting water between their shells.

__________________ are best known because of their ability to produce pearls. The secrete the pearly substance in layers around sand or irritating objects that gets in their shells.

CLASS - __________________ (belly-footed)

Snails are called __________________ because they have only one shell.

__________________ have no external shell, some may have an internal shell.

CLASS - __________________ (head-footed)

Squid, __________________, Cuttlefish, Nautilus

Most have no external shell, have tentacles (8 in octopus, 10 in squid, 94 in nautilus)

All cephalopods are __________________.

They have advanced __________________ systems and are capable of learning.

PHYLUM - ECHINODERMATA

Echinoderm means "__________________."

Starfish, Sea Urchins, Sand __________________, and Sea Cucumbers.

STARFISH - have a varied number of arms that radiate from a central disc.

ORAL SURFACE is located on the __________________ side of the central disc. The stomach, located just inside the mouth, can be turned inside-out to digest its food.

A __________________ SYSTEM uses water pressure in a __________________ CANAL and RADIAL CANALS to form a "skeleton" and grip objects with their __________________ FEET.

Starfish often feed on __________________ and __________________, using their tube feet and arms to pull the oyster's shells apart.

Starfish reproduce __________________, a few are hermaphroditic. They may release over 2 million eggs at a time.

They have a remarkable powers of __________________.