BIOL 111 Lecture Notes - Lecture 15: Posterior Pituitary, Glycogen, Cath Database

• School: McGill University
• Department: Biology (Sci)
• Course: BIOL 111
• Professor: Suzanne Gray

Document Summary

4 major groups with phylogeny currently in revision: Hexapods (includes insects; dominant in terrestrial environment) Centipedes (chilopoda: 1 pair of appendages per segment, carnivores, ~3000 species (less diverse) Millipedes (diplopoda: 2 pairs of appendages per segment, detritivores, herbivores, ~11,000 species (more diverse) ~ both tend to be small but can grow up to 30 cm in length. 2 body regions: cephalothorax appendages, abdomen no appendages. Pairs of appendages: #1 (chelicerae) fangs, #2 (pedipalps) copulatory organs, pincers, #3,4,5,6 walking legs (4 pairs of walking legs) Dominant marine arthropod, but also in freshwater and terrestrial environments. Compose zooplankton : example: daphnia; move on their own but cannot fight the water current. Spiny tail as a defense mechanism; makes it difficult for small fish to eat them. Abundant in fw and terrestrial environment, but few marine. Example: springtails are not insects (internal mouthparts) but are considered to be a hexapod.