CHARACTERISTICS
CHARACTERISTICS
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"Jointed-legged animals"
Body Type: Segmented body divided into head, thorax, and abdomen (in most).
Symmetry: Bilateral symmetry.
Tissues: Triploblastic.
Body Cavity: Coelomate.
Skeleton: Exoskeleton made of chitin; provides protection and support.
Appendages: Jointed legs — name “Arthropoda” means “jointed feet.”
Digestive System: Complete with specialized mouthparts.
Circulation: Open circulatory system (blood flows through body cavity).
Respiration: Through gills, tracheae, or book lungs (depending on group).
Excretion: By Malpighian tubules or green glands.
Nervous System: Well-developed with brain and ventral nerve cord.
Reproduction: Mostly sexual, sexes usually separate.
Habitat: Found everywhere — land, air, and water.
CLASSIFICATIONS
CLASSIFICATIONS
Class Insecta
Class Insecta
Has a three-part body (head, thorax, and abdomen), a hard exoskeleton, three pairs of jointed legs (six legs total), and usually one pair of antennae
Examples: bees, beetles
Habitat: land, air
Class Arachnida
Class Arachnida
Has eight legs, a body divided into two parts (a cephalothorax and abdomen), and the absence of antennae and wings
Has hard exoskeleton
Examples: Scaroptes scabiei, ixodes scapularis
Habitat: land, freshwater
Class Crustacea
Class Crustacea
Has a hard, segmented exoskeleton, jointed appendages, and two pairs of antennae also has 10 legs
Has hard outer shell (exoskeleton)
Usually have antennae on their head
Examples: crab, lobster, shrimp
Habitat: freshwater, marine, land
Class Chilopoda
Class Chilopoda
one pair of legs per body segment, a flattened body, venomous claws (forcipules) for subduing prey, a pair of antennae, and simple eyes
Examples: centipede
Habitat: land
Class Diplopoda
Class Diplopoda
two pairs of jointed legs on most body segments, a cylindrical body, and a diet of decaying plant matter
Examples: milipede
Habitat: land
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