BIO 112 Lecture Notes - Lecture 12: Pupa, Internal Fertilization, Eardrum
16 Nov 2016
School
Department
Course
Professor
Document Summary
Ecdysozoans very outer layer is the cuticle or exoskeleton. Ecdysis is the shedding of the skin and producing a new cuticle. Arthropoda- jointed feet segmented insects, crustaceans(have a cephalothorax), centipedes, scorpions(chelicerates, appendages in front of mouth) etc vvv. Coleoptera - beetles more than any other species. Separate sexes, sperm must be delivered (internal fertilization) insects some have compound eyes (onimatidia) detect motion very well but do not form clear pictures can detect sound with the tympanic membrane(sound receptor) Cephalized nerve cord on belly side antagonistic muscle pairs are attached to exoskeleton to move appendages insects have wings but usually only use the under pair allow them to habituate much much more places. Complete - egg, larvae, pupa, adult (egg, caterpillar, crysallis, adult) vs. egg, nymphal stages, adult (nymphs lack wings) only adults can reproduce most insects will only shed skin when undergoing development. some will shed at all times.
