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Arthropods
By: Amber Carr, Olivia Zulisky, Kayla Sabatine
What is an Arthropod?
Bilaterally symmetrical organism with jointed appendages
and an exoskeleton
Arthropods include:
● crustaceans
● centipedes
● millipedes
● arachnids
How do Arthropods move?
segmented appendages
muscles attach to inside of skeleton and act as a lever
system
some have wings
*how they move makes them able to live anywhere*
Nervous System
Present
simple dorsal brain linked to a ventral nerve
Ganglia - group of nuclei (cluster of neurons) in brain
located in the cerebral cortex
Digestive System
One-way digestion
Type of feeding depends on mouth structure.
● Carnivores
● Herbivores
● Detritivores
● Filter feeders
Excretory System
Crustaceans and arachnids
paired excretory organs
Insects and some spiders have Malpighian tubules
open into the intestine
Circulatory System
● Open
● Blood flows freely within body cavities
○ direct contact with internal tissues/ organs
● Hemolymph
○ Blood, intercellular
fluid, and lymph
Respiratory System
Aquatic
gills
Terrestrial
tracheae and book lungs
Reproductive System
Either Male or female (no hermaphrodites)
Sexual reproduction
*sperm is transferred to female via
spermatophores*
Crustaceans
live in water
5 pairs of jointed legs
scavengers ~ specialized mouths to crush prey/claws
crabs
lobsters
shrimp
Centipedes
“100-legger”
14-177 pairs of legs
carnivorous
spiders, worms
venomous claws behind head
Millipedes
“1,000 legger”
40-100 pairs of legs
detritivore
eat damp or decaying wood, leaves, plants
Arachnids
scorpion, tick, spider
2 body segments
8 legs
fangs
Tobias, Noah, and Harry
Insects
stink bug, cricket, bee
3 body segments
head, thorax and abdomen
6 legs
Other Phylum Facts
Arthro | pods = joint | foot
external covering
made up of chitin
thin
tough for protection
Works Cited
Britannica.com