Alisha Horst, Cecelia King, and Amber Plank

• Referred to as segmented worms

• Found in deep marine sediments as well as common soils

• Split into three groups: polychaeta, oligochaeta (earthworms), and hirudinea (leeches)

• Polychaeta (live in almost all marine environments) is the bulk of the annelid group but the other two groups are most familiar for humans

Have three body regions

Majority of the body is made of repeated sections called segments

Examples: earthworms, leeches

*activity – earthworm dissection

Worm Dissection

molluscus- Latin meaning soft

Soft bodied with an internal or external shell

Four body partsShell- made of calcium carbonate (CaCO3)

secreted by glands in the mantleMantle- thin tissue covering body. Secretes

the shellMuscular foot- mouth and other feeding

partsVisceral mass- internal organs located here

Bilaterally symmetrical

Have 1 or 2 shells

Produce a trochophore (larva)

RespirationAquatic mollusks: gillsLand mollusks: mantle cavity lined

with blood vessels, “skin breathing”

Internal TransportSessile and slow moving mollusks:

open circulatory system- blood flows into internal body cavities

Fast moving mollusks: closed circulatory system

ReproductionExternal fertilizationInternal fertilization (mollusks

with tentacles and some snails)Cross fertilization (snails that

are hermaphrodites)Mollusk Video Clips

Mollusks

Examples: Squid, Giant Clams, Octopus

Vampire Squid

*activity – squid labeling paper

Squid Labeling Key

Groups of animals include:Starfish, urchins, feather stars and

sea cucumbers

Sand Dollar Video

They are simple animals:They don’t have A brainComplex sensing

organsFront or back endHead

They do have:Spiny skin5 part radial

symmetryInternal skeletonCentral mouthDevelop sharp

spines for protection

They are found in a variety of shapes and colors.

They cling to coral reefs around the world

They live entirely in water

What it does:Feeding, movement, internal

transport, respiration, and excretion

Some of these animals are carnivorous, and feed and scavenge the ocean floor

All echinoderms move around with the use of thousands of tiny tube feet, many of which have suction cups on the ends

The most unusual feature to echinoderms is their water vascular system. It contains a network of fluid-filled canals connected to countless tube feet.