1. Phylum ArthropodaSubphylum Crustacea

2. General Characteristics • Crustaceans are found in marine, freshwater, and terrestrial habitats. • Possess jaw-like appendages called mandibles and maxillae (instead of chelicerae like Subphylum Chelicerata). • Crustaceans have two pairs of antennae and two pair of maxillae. • Some appendages are biramous.

3. General Characteristics • Exoskeleton made of chitin without a waxy cuticle. • Respiration is through gills. • Crustaceans are the only group of arthropods that typically live in water. • Crustaceans are highly segmented. More derived forms are tagmatized and show fewer, more specialized, limbs.

5. Adult Female Adult Male Form I Form II Copulation Egg Immature (direct development) Crayfish Life Cycle

7. FemaleCrayfishes Gonopore Annulus ventralis Glair Glands

8. Male Crayfishes Form II Form I Male Gonopods

9. Crayfish Copulation

10. Crayfish Eggs Female “In berry” Eggs attached to swimmerets

11. Hatching and Early Development Photo by Chris Lukhaup

15. http://www.biology.duke.edu/dnhs/pics/pics.html

16. http://www.caves.com/fss/pages/trips/images/SnailShell/New%20Folder/crayfish02.jpghttp://www.caves.com/fss/pages/trips/images/SnailShell/New%20Folder/crayfish02.jpg http://biology.uky.edu/Cooper/PhotosWWWLab/caveCr1.gif

17. Other Crustaceans Water flea Robber Crab http://upload.wikimedia.org/wikipedia/en/c/c8/Cococrb2.jpg http://daphnia.cgb.indiana.edu/images/Daphnia_DGC.png

18. Fairy Shrimp http://news.nationalgeographic.com/news/2005/03/images/050316_fairyshrimp.jpg

20. Barnacles (mating) http://www.marlin.ac.uk/species/Semibalanusbalanoides.htm

21. Ostracod http://www.plingfactory.de/Science/Atlas/KennkartenTiere/Crustacea/Ostracod%203a.jpg

22. Copepod http://www.microscopy-uk.org.uk/mag/imagsmall/copepod.jpg

24. http://home.pacbell.net/scarrico/pics/exclnt_mantis_shrimp.jpghttp://home.pacbell.net/scarrico/pics/exclnt_mantis_shrimp.jpg