BIOL 101 Lecture Notes - Lecture 15: Anterior Pituitary, Ecdysis, Chelicerae
13 Jan 2016
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Document Summary
4 major groups with phylogeny currently in revision. 2 pairs of appendages per segment (each visible segment a pair of fused segments) #2 pedipalps copulatory organs, pincers. #3,4,5 & 6 walking legs (4 pairs) Dominant marine arthropods (found in freshwater & terrestrial environments) Abundant in freshwater & land, but few marine species. Springtails are not insects (internal mouthparts) but are hexapods. Abundant & diverse group that includes fleas, bees, termites, aphids, grasshoppers, butterflies, etc. Herbivores, detritivores, fluid-drinkers, predators, scavengers & parasites. Diversity in mouthparts adapted for different feeding modes: Dorsal branches used in gas exchange drosophila wing. The wing of an insect & gill of a crayfish are: Analogous would mean same function but different. Holes (spiracles) open into tubular tracheae, branch ancestry (e. g. bats & insects) Insects & most myriapods: to finer tubes. Some have spiracles & tracheae, book gills or book lungs. Dorsal tubular heart (1 chamber) with pores (ostia) drives hemolymph into hemocoel spaces.
