Invertebrates and Organism Statistics

Vocabulary flashcards covering the classification of various invertebrates and the percentage distribution of different organisms on Earth.

Invertebrates

Animals without a backbone.

Arthropoda (Arthropods)

A group of animals that all have a hard outer skeleton and jointed legs.

Insects

Animals that have $3$ segments to their bodies and $6$ legs.

Grundaries

Animals that have $2$ segments to their bodies and $8$ legs.

Myriapods

Animals with long segmented bodies and $1$ or $2$ pairs of legs on each segment.

Echinoderms

Animals characterized by having spiny skin.

Molluscs

Animals with muscular bodies and no giny she shells.

Cnidaria

Organisms such as jellyfish, corals, and sea anemones that have no legs and stinging tentacles around their mouths.

Worms

Animals with no legs and long bodies, including tapeworms and earthworms.

Percentage of Arthropods

Represent $60\%$ of organisms on earth.

Percentage of Invertebrate animals

Represent $70\%$ of organisms on earth.

Percentage of Vertebrate animals

Represent $3\%$ of organisms on earth.

Percentage of Plants

Represent $22\%$ of organisms on earth.