Invertebrates make up 95% of all animal species and are defined as animals without a backbone. The document outlines the main types of invertebrates such as sponges, jellyfish, worms, mollusks, arthropods and others. It provides examples of types within these groups like porifera being sponges, cnidaria including jellyfish and hydroids, and arthropoda containing lobsters and spiders.

1. INVERTEBRATES
Samantha Luangkhot

2. Invertebrates
 An invertebrate is an animal without a backbone.
 Invertebrates make 95% of all animal species.
 Types of invertebrates:
 Porifera
 Cnidaria
 Platyhelminthes
 Mollusca
 Annelids
 Echinodermata
 Arthropoda
 Vertebrates usually reproduce sexually or
asexually.

3. Continued…
 Invertebrates
are
heterotrophs:
feeding off
other
organisms for
nutrition.
 Their cells
lacks rigid cell
walls.
 Invertebrates
are

4. Examples…
 Porifera: lacks tissues, sponges;
 Cnidaria: “stinging creatures” jellyfishes,
hydroids,
 Platyhelminthes: no body cavity, parasites;
worms.
 Mollusca: soft body protected by a hard shell
of calcium carbonate; octopus.
 Arthropoda: hard exoskeleton, open circulatory
system; lobster, spiders.

5. Examples

6. Citations
 https://sites.google.com/a/mrswan.net/wiki/stu
dent-pages/nanci-rivera/ch-33-invertebrates
 http://en.wikipedia.org/wiki/Invertebrate
 http://www.oum.ox.ac.uk/thezone/fossils/invert
s/index.htm