1. Phylum Arthropoda Subphylum Crustacea

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

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

5. Crayfish Life Cycle Adult FemaleAdult Female Adult MaleAdult Male –Form I –Form II CopulationCopulation EggEgg Immature (direct development)Immature (direct development)

7. FemaleCrayfishes Female Crayfishes Glair Glands Annulus ventralis Gonopore

8. Male Crayfishes Male Gonopods Form II Form I

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

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

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

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

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

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

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