BIO SCI 94 Lecture Notes - Lecture 55: Cambarus, Subphylum, Merostomata

• School: UC-Irvine
• Department: Biological Sciences
• Course: BIO SCI 94
• Professor: Michael Clegg

Document Summary

Tagmata (fusion of several segments to make a new functional structure- like ahead on throax) Head: cephalon (comprising at least 5 fused segments) Burrow through ocean mud preying on small invertebrates. Head and thorax are fused into a cephalothorax. 5 pair of walking legs located on the underside of the cephalothorax. Appendages (chelicerae tear food apart may contain poison) Have 11-100 segments each bearing 2 pairs of legs. Single pair of antennae and mandibles on their head. At least 15 leg - bearring segments (each with single pair of legs) Before you cut anything observe the external anatomy and know the following structures. Antenna, abdomen, chelliped, telson, rostrum, uropod, 2nd walking leg, 3rd walking leg, anus, sternum, carapace, swimmerets, cervical groove, gills, 4th walking leg, 5th walking leg, 1st maxilliped, 2nd maxilliped, 3rd maxilliped, mouth. Determine if your crayfish is male or female. Use the dissection guide and figures attached and pg.