arthropods part 2

chelicerata 2 pairs of mouth parts

chelicerae: jointed appendages, fangs for injecting venom; pedipalps: sensory, seize prey, sperm transfer

chelicerata 2 main body parts

cephalothorax: head fused w/ thorax appendages; abdomen: reproductive organs

arachnida

trachea or book lungs, secrete enzymes to digest externally, carnivorous, poison glands, ocelli

chelicerata have what kind of lungs

book lungs

chilopoda

nocturnal, carnivorous, antennae

diplopoda

each body segment has 2 pairs of 7-jointed legs, detritivores

crustacea

marine, freshwater, gills, herbivores, ommatidia, antennae

insects

ocelli and ommatidia, sensory receptors: setae, tympanium membrane, antennae

incomplete metamorphosis

3 life stages: egg, larva that resembles adult, adult

complete metamorphosis

4 life stages: egg, larva unlike adult, pupa, adult

simple eyes

ocelli, single lens, perceive light, horizon detection

arthropods complex organ systems

long heart, nervous system: brain=3 fused pairs of dorsal ganglia, ventral ganglia control activities, resp system: trachea, spiracles

trachea; spiracles

cuticle-lined air ducts; openings in exoskeleton

hexapoda, myriapoda, and arachnids excretory system

malpighian tubules: nitrogenous waste precipitates as uric acid or guanine