{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

04 CRAYFISH 2009 - Ancestral Coelomate Annelids Phylum...

Info iconThis preview shows pages 1–8. Sign up to view the full content.

View Full Document Right Arrow Icon
Arthropoda Segmented body Jointed appendages Exoskeleton Protostome Ancestral Coelomate Annelids Phylum
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Crayfish and shrimp are all in class Crustacea Five pairs of thoracic appendages are legs (hence suborder name ‘decapoda’) Head and thorax dorsally fused
Background image of page 2
Anterior head Posterior tail Dorsal back Ventral belly Medial middle Lateral sides Proximal near body Distal away from body
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
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 modified as sperm ducts
Background image of page 4
Appendages Cephalothorax sensory feeding respiration feeding (gills) Walking legs 5 pairs U T Abdomen 6 segments Swimmerrets-swimming + Reprod. Uropods + telson - swimming.
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Open circulatory system Heart Sinuses Heart arteries ostia Ophthalmic- eyes Antennal- antennae, antennules, green glands Hepatic- digestive gland Arteries Ostia
Background image of page 6
Respiratory System Gills under carapace Hemolymph -blood
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 8
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}