Arthropods!

Do Now:

1. Turn in Earthworm dissection

Phylum Arthropoda• Biggest phylum of animals

currently alive and extinct.• Several _________ different

species• Exist in every environment, in

almost every ecosystem on Earth.

• By any measure, the most “successful” animal phylum. ______ of all known species of animal are arthropods.

What Makes an Arthropod?

• _______________:– Hard, protective

outer “shell.”– Used for movement– contains_________,

a ________________.

Exoskeleton for ___________________• Your muscles are attached to an _______________.• An exoskeleton serves the same purpose

What Else Makes an Arthropod?

• ____________________ symmetry

_______________________ body plan• Each segment has at least 1 pair of _____________.– Legs, antenae, flipers, claws, etc. are all appendages.– Some segments may be fused together.

3 Main Body Sections • Called _____________: Some may be fused

___________ Appendages (and lots of ‘em)

Recap: Arthropod Characteristics

• ____________________________• ___________________________ symmetry• Segmented body plan (3 ___________: head,

thorax, abdomen)• Jointed appendages (many pairs). Note: arthropod

means “________________________.”

Arthropod Circulatory System

• ________________ circulatory system with heart.

Arthropod Respiration• Gills/__________________: oxygen diffuses into blood• ________________: air moves into insect directly

Types of Arthropods

• Domain: ____________• Kingdom: ___________• Phylum: Arthropoda

• Classes: ________________________________________________________________________________

The Family Tree

Class Crustacea: The Crustaceans• Only arthropod class with ________________

_____________________________________ .

• Includes crabs, lobsters, shrimp, as well as ___________.

Class Crustacea: The Crustaceans

Crustacean Orders

• “True” Crustaceans = Order ________________– 5 pairs of legs– 2 tagmata• Cephalothorax• Abdomen

• “Pillbugs” = Order _________– 7 pairs of legs– 3 tagmata

Class Insecta• _____________

of antennae

• ____________ of legs

• ______ tagmata

• Wings or wingless

Insect Diversity• Biggest order of

animal on Earth• Over

______________documented species.

• Highest estimates suggest up to 30,000,000 species may exist.

Class ____________________: Spiders, Ticks, Scorpions, Mites, etc.

• _______ antennae

• __________ pairs of legs

ArachnidsTrilobites =

Extinct Arachnids

Centipedes And Millipedes: Class Myriapoda

• _____________of antennae.• Two tagmata: _____________ and _________

2 pairs of legs per segmentMillipedesubclass diplopoda

1 pair of legs per segmentcentipedesubclass chilopoda

Recap: Arthropod Family TreePhylum Arthropoda

Deca-poda

Iso-poda

many orders many orders, including extinct trilobites

Chilopoda

diplopoda