BIOL 111 Lecture 10: Lecture 10 Arthropods II
15 Jan 2019
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Document Summary
Chelicerae stores venom for predation on top of fangs. Used for sexual attraction as well as warning sign. Reflects uv so they glow in the dark. Ecdysozoa clade (arthropods and nematodes) metamorphosis and hormones. Sexual selection, has one massive anterior appendage, Very diverse, 73% of all animal species one tiny one. Coleoptera (beetles) are the most diverse animal group, making 29% of species. Large heart in chelicerates on dorsal section of abdomen, circulation through arteries. Decapods, small heart in cephalothorax distributes lymph. Insects have an elongated heart in their abdomen. Moulting enables change in morphology from juvenile to adult. Dragonfly example, emerges from back of thorax. Ecology of same individual is very different before and after reaching maturity. Crustaceans moult throughout their adult life as well. Way for them to shed exoskeleton and grow more. Distinguishable as nymphs do not have wings.
