INVERTEBRATES

Samantha Luangkhot

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

Invertebrates usually reproduce sexually or asexually.

Continued…

Invertebrates are heterotrophs: feeding off other organisms for nutrition.

Their cells lacks rigid cell walls.

Invertebrates are multicellular: cells that undergoes different functions.

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.

Examples

Citations

https://sites.google.com/a/mrswan.net/wiki/student-pages/nanci-rivera/ch-33-invertebrates

http://en.wikipedia.org/wiki/Invertebrate http://www.oum.ox.ac.uk/thezone/fossils/

inverts/index.htm