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28-1 Intro to Arthropods

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Katelynn Dorn

on 31 March 2014

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Transcript of 28-1 Intro to Arthropods

28-1 Intro to Arthropods
What Is an Arthropod?
tough exoskeleton
jointed appendages
segmented body
terrestrial arthropods
have waxy covering
terrestrial- Malphigian tubules
aquatic- diffusion moves waste
herbivores, carnivores, omnivores
different mouth parts- pincers, fangs, sickle-shaped jaws
Growth and Development
- exoskeleton shed to make larger one
hormone-controlled- skin glands digest inner exoskeleton, other glands secrete new exoskeleton
molting at night
open circulatory system
heart pumps blood to arteries and enters tissues
blood leaves vessels through cavities collects in large sinus around heart before it reenters to be pumped again
terrestrial arthropods
tracheal tubes
book lungs
aquatic arthropods
lobsters/crabs- gills
horseshoe crabs- book gills
Response and Movement
brain connected to ventral nerve cord by 2 nerves around esophagus
ganglia (groups of nerve cells) coordinate movement of individual legs and wings
eyes, taste receptors
muscles- made of muscle cells, flex and extend
pull of muscles against exoskeleton allows movement
terrestrial- internal fertilization
male deposits sperm in female
female picks up a sperm packet from male
aquatic- internal or external
female releases eggs, male sheds sperm around eggs
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