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 insects 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 Parasites 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 pairs of legs carnivorous spiders, worms venomous claws behind head Millipedes 1,000 legger 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