[PPT]26-2 Sponges - cypresswoodsbiology - homecypresswoodsbiology.wikispaces.com/file/view... · Web viewcopyright cmassengale Colonial Hydrozoan (not a single organism Tentacles

Copyright Pearson Prentice Hall

Invertebrates are animals that have no backbone, or vertebral column.

Invertebrates make up over 95% of all animal species.

They include sea stars, worms, jellyfishes, and insects.

What Is an Invertebrate?


26-2 Sponges

What is a Sponge? Sponges are the simplest and most

ancient animals in the phylum Porifera which means

“pore-bearers.” live their entire adult life as sessile

organisms; attached to a single spot.


What is a Sponge?

◦Body Plan Sponges are asymmetrical;

they have no front or back ends, no left or right sides.


Form and Function in Sponges

◦Feeding Sponges are filter feeders. As water moves through the sponge,

food particles are trapped and engulfed by choanocytes that line the body cavity.



◦Circulation Sponges rely on movement of water

through their bodies to carry out body functions.



Branching Tube Sponge

Stove Pipe Sponge

Vase Sponges

Barrel Sponges

Ball Sponges

Rope Sponges


26-3 Cnidarians

What is a Cnidarian? Cnidarians are soft-bodied, carnivorous animals that have stinging tentacles arranged in circles around their mouths.


What is a Cnidarian?

Body symmetry ◦Cnidarians are radially symmetrical. They

have a central mouth surrounded by numerous tentacles that extend outward from the body.


Form and Function in Cnidarians

◦Feeding A cnidarian pulls its food through its

mouth and into its gastrovascular cavity, a digestive chamber with one opening.

Food enters and wastes leave the body through that same opening.



◦Circulation Following digestion, nutrients are

usually transported throughout the body by diffusion.



copyright cmassengale 23

• Colonial Hydrozoan (not a single organism

• Tentacles sting prey such as fish & humans

• Polyps in colony feed

• Has gas-filled air float

Portuguese man-of-war


Anthozoans


Hydra Feeding


Food in Gastrovascula

r Cavity


Scyphozoans

Some Jellyfish Show

Luminescence

28

29


27–1 Flatworms


Flatworms are acoelomates, which means they have no coelom.

A coelom is a fluid-filled body cavity that is lined with tissue derived from mesoderm.

The digestive cavity is the only body cavity in a flatworm.

Flatworms have bilateral symmetry. Flatworms are the simplest animals to

have 3 embryonic germ layers

What Is a Flatworm?


◦Feeding Flatworms have a digestive cavity with

a single opening through which both food and wastes pass.

Near the mouth is a muscular tube called a pharynx.

Flatworms extend the pharynx out of the mouth. The pharynx then pumps food into the digestive cavity.

Form and Function in Flatworms


◦Circulation Flatworms do not need a circulatory

system to transport materials they rely on diffusion

Form and Function in Flatworms

Tapeworm Anatomy



27–2 Roundworms

RoundwormsRoundworms

http://www.apsnet.org/education/illustratedglossary/PhotosN-R/nematode.jpg


◦Roundworms are unsegmented worms that have pseudocoeloms and digestive systems with two openings—a mouth and an anus.

◦Roundworms have bilateral symmetry.

What Is a Roundworm?


◦Feeding Many free-living roundworms use

grasping mouthparts and spines to catch and eat other small animals.

There are a variety of parasitic roundworms as well

Form and Function in Roundworms


◦Circulation They depend on diffusion to carry nutrients

and waste through their bodies.

Form and Function in Roundworms

Cysts in Contaminated Pork


27-3 Annelids


What Is an Annelid?◦Annelids are worms with segmented

bodies. They have a true coelom that is lined with tissue derived from mesoderm.

◦Annelids have bilateral symmetry.

What Is an Annelid?


◦Feeding and Digestion In carnivorous species, the pharynx

usually holds two or more sharp jaws that are used to attack prey.

Annelids that feed on decaying vegetation have a pharynx covered with sticky mucus.

Other annelids obtain nutrients by filter feeding.

Form and Function in Annelids


◦Circulation Annelids typically have a closed

circulatory system, in which blood is contained within a network of blood vessels.

Form and Function in Annelids





Documents

[PPT]26-2 Sponges - cypresswoodsbiology - homecypresswoodsbiology.wikispaces.com/file/view... · Web viewcopyright cmassengale Colonial Hydrozoan (not a single organism Tentacles