Which of these animals are called fish, but really aren’t?

1. Which of these animals are called fish, but really aren’t?

2. Which of these animals are not called fish, but really are?

3. How does the body plan of a fish differ from that of the other animals pictured?

• They have different types of body symmetry

INVERTEBRATES• Invertebrates are animals without backbones.

• They range from sponges, cnidarians (like jellyfish), worms, arthorpods (insects, shellfish, to echinoderms (starfish)

• Some are very simple and do not have organs, some do not have skeletal structures, and those that do usually have exoskeletons

INVERTEBRATESSPONGES CNIDARIANS

WORMS

MOLLUSKS

ARTHROPODS

Most successful animal

ECHINODERMS

These are the only

invertebrates that have an

endoskeleton

SPONGES

Body Shape: Asymmetrical

Size: Some are as small as a quarter and some are as big as a door

The simplest animal

• Invertebrates make up 95 percent of all animals.

Habitat: All marine and freshwater

Under Phylum: Porifera, which means “pore bearer”

Movement: Sessile as adults

Asexual reproduction occurs when a piece of the sponge falls off, settles, and grows into a new sponge.

SPONGES

Sponges can reproduces both asexually and sexually!

Most sponges reproduce sexually.

• Some sponges have separate sexes, but most sponges are hermaphrodites.

• A hermaphrodite is an animal that can produce both eggs and sperm.

SPONGES

Hermaphrodites do not fertilize their own gametes, but cross-fertilize with

other organisms of the same species.

The animal kingdom as a whole is diverse like the sponges themselves….

Some invertebrates are asexual:

This means the offspring comes from part of the organism and is AN EXACT genetic copy of the parent animal.

Examples of Asexual Animals:

Some Jellyfish

Some Starfish

Sponges

Some worms

Some insects

The animal kingdom as a whole is diverse like the sponges themselves….

Many animals are sexual:

This means there are male and female gametes produced and the sperm fertilize the egg to create new offspring. The offspring are not genetically identical to one parent.

Examples of Sexual Animals:

Almost all vertebrates

Most Insects

Some jellyfishAh ha!

Male coral releasing sperm into the water, for EXTERNAL fertilization.

Hermaphrodites are a type of sexual reproducing animal:

These are animals that make both sperm and eggs, but they do not fertilize themselves (there would be no point if they did because their offspring would be identical to them), so they swap sperm and eggs with other hermaphrodites to produce genetically different offspring.

Examples of Naturally Sexual Hermaphrodite Animals:

Snails

Most worms

Banana slugs

Hamlets (type of fish)

Disturbing

VERTEBRATES

A vertebrate is an animal with an endoskeleton and a

backbone.

PHYLUM: CHORDATA

BODY PLAN: ALL HAVE BILATERAL SYMMETRY

VERTEBRATES

All vertebrates have:

CLOSED CIRCULATORY SYSTEM

A NERVOUS SYSTEM WITH COMPLEX BRAINS

COMPLEX SENSORY ORGANS

EFFICIENT RESPIRATORY SYSTEMS

VERTEBRATESFISH

AMPHIBIANS

REPTILES

BIRDS

MAMMALS