04 CRAYFISH 2009 - A r t h r o p o d a Segmented body...

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Unformatted text preview: A r t h r o p o d a Segmented body Jointed appendages Exoskeleton Protostome Ancestral Coelomate Annelids Phylum Crayfsh and shrimp are all in class Crustacea Five pairs o thoracic appendages are legs (hence suborder name decapoda) Head and thorax dorsally used Anterior head Posterior tail Dorsal back Ventral belly Medial middle Lateral sides Proximal near body Distal away from body External anatomy Exoskeleton chitin molt ~1 x / year. Two major body regions Specialized appendages Genital pores at base of 3rd pair of walking legs. Seminal receptacle Swimmerrets used to carry eggs Genital pores at posterior of cephalothorax 1st pair of swimmerrets modiFed as sperm ducts Appendages Cephalothorax sensory feeding respiration feeding (gills) Walking legs 5 pairs U T Abdomen 6 segments Swimmerrets-swimming + Reprod. Uropods + telson - swimming. Open circulatory system Heart Sinuses Heart arteries ostia Ophthalmic- eyes Antennal- antennae, antennules, green glands Hepatic- digestive gland Arteries Ostia Respiratory System Gills under carapace Hemolymph -blood food...
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This note was uploaded on 04/01/2009 for the course BIO 49125 taught by Professor Allen during the Spring '09 term at University of Texas at Austin.

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04 CRAYFISH 2009 - A r t h r o p o d a Segmented body...

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