Phylum Arthropoda Subphylum Crustacea

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Phylum ArthropodaSubphylum Crustacea
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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.

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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.

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Crayfish Life Cycle

• Adult Female
• Adult Male
• Form I
• Form II
• Copulation
• Egg
• Immature (direct development)

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Female Crayfishes
Gonopore
Annulus ventralis
Glair Glands
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Male Crayfishes
Form II
Form I
Male Gonopods
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Crayfish Copulation
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Crayfish Eggs
Female In berry
Eggs attached to swimmerets
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Hatching and Early Development
Photo by Chris Lukhaup
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http//www.biology.duke.edu/dnhs/pics/pics.html
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http//www.caves.com/fss/pages/trips/images/SnailS
hell/New20Folder/crayfish02.jpg
http//biology.uky.edu/Cooper/PhotosWWWLab/caveCr1
.gif
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Other Crustaceans
Water flea
Robber Crab
http//upload.wikimedia.org/wikipedia/en/c/c8/Coco
crb2.jpg
http//daphnia.cgb.indiana.edu/images/Daphnia_DGC.
png
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Fairy Shrimp
http//news.nationalgeographic.com/news/2005/03/im
ages/050316_fairyshrimp.jpg
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Barnacles (mating)
http//www.marlin.ac.uk/species/Semibalanusbalanoi
des.htm
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Ostracod
http//www.plingfactory.de/Science/Atlas/Kennkarte
nTiere/Crustacea/Ostracod203a.jpg
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Copepod
http//www.microscopy-uk.org.uk/mag/imagsmall/cope
pod.jpg
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http//home.pacbell.net/scarrico/pics/exclnt_manti
s_shrimp.jpg