Phylum Arthropoda• Jointed appendages• Exoskeleton• Bilateral symmetry• Open Circulatory System• Well developed nervous

system with a Brain• Well developed muscles

Subphylum Uniramia

• Unbranched appendages

Subphylum Uniramia

• Unbranched appendages

• Jaws

Jaws

Subphylum Uniramia

• Unbranched appendages

• Jaws

• One pair of antennae

Class Insecta

• Six walking legs

• Three body sections

Mosquito

Dragonfly

Wasp

Ants

Grasshopper

Praying Mantis

MonarchButterfly

Butterfly Metamorphosis

Zebra Butterfly

Bee

Walking stick

Class Chilopoda

• Has many body segments• Each segment has one pair of legs• Centipedes

Centipede fangs

Class Diplopoda

• Each segment has two pairs of legs

• millipedes

Subphylum Chelicerata• Specialized Mouth Parts:

– Chelicerae • Move up & down (stab)

• Often have fangs

– Pedipalps (used to grab prey)

Chelicerae with Fangs

Pedipalps

Subphylum Chelicerata

• Specialized Mouth Parts

• 2 body sectionscephalothoraxabdomen

Class Arachnida

8 Walking Legs

Spiders

8 Simple eyes

Silk glands

Banana Spider

Crab Spider

Flame TarantulaFlame Tarantula

Tarantula

Chelicerae

Scorpion

Chelicerae

Scorpion Chelicerae

Deer Tick

Tick under a microscope

Chelicerae

Mite

Water mite

Class Merostomata

Horseshoe CrabOnly living member of this class

Horseshoe crab chelicerae

Horseshoe Crab

Compound eyes

Book gills

Many Taxonomists split the class Merostomata into two classes:

• Xiphosura – horseshoe crabs

• Eurypterida - eurypterids

Subphylum Crustacea

• 10 legs

• Two pair of antennae

• Mandibles (chewing mouthparts)

Blue Crab Mandibles

Subphylum Crustacea

• 10 legs• Two pair of antennae• Mandibles (chewing mouthparts)• 2 or 3 body parts• Predominantly aquatic

Spiny Lobster

Banded Coral Shrimp

Anemone Shrimp

Anemone Shrimp

Peterson’s Shrimp

Shrimp

Red Night Shrimp

Spider Crab

Arrow Crab

Star-eyed Hermit Crab

Decorator Crab

Gooseneck Barnacles

http://www.oceanfootage.com/video_clips/HH10_012

Pill Bug