ZOO 2700 Lecture Notes - Lecture 26: Malpighian Tubule System, Hydrogen Cyanide, Millipede

• School: University of Guelph
• Department: Zoology
• Course: ZOO 2700
• Professor: Alex Smith

Document Summary

Myriapoda: centipedes and millipedes trunk is not divided. Median ocelli are lost no crystalline cones ommatidia loosely arranged trachea chilopoda: centipedes they don"t have 100 legs (less) 3 pairs of mouthparts first maxilla second maxilla. Maxilliped/prehensor ( poison claw") predators anal legs not locomotory (sensory instead) relatively flat-bodied have a very permeable skin (permeable integument) spiracles are always open. Malpighian tubules independently evolved uric acid lifespan of 4-6 years diplopoda: millipedes. ~700 legs nocturnal hard mineralized cuticle calcium salts hydrogen cyanide diplosegments fusion of two segments. 2 pairs of legs per segment dragon millipedes (recently described species - very cool!) in eastern canada, there are 48 species half of these are introduced. 2 mm - 30 cm size range very diverse, over 10,000 described species gnathochilarium ( lower lip" - used for chemosensory) chelicerata. 2 tagmata cephalothorax and abdomen chelicerae (pincers) pedipalps (typically sensory, but very diverse) 4 pairs of walking legs pycnogonida - sea spiders!