BIOL 205 Lecture 11: Arthropoda1.pdf
Document Summary
Arthropoda: segmented protostomes with teloblastic growth, strong heteronomy , complete gut, modified metanephridia , adult coelom greatly reduced, open circulatory system , heart ______________ & ________________ 8: molting process , jointed appendages with intrinsic musculature, annelid-like nervous system . 12: intersegmental muscle bands (not sheets, all habitats; >1,000,000 spp. (8-20 million more?) Head appendages: 5 pairs: antennules, antennae, mandibles, maxillules, maxillae mouth anus. Head appendages: 2 pairs: chelicerae , pedipalps mouth anus. Head appendages: 4 pairs: antennae, mandibles, maxillae, labia anus mouth. * no circular muscle epidermis / hypodermis gut. * feeding: no functional cilia: chelicerates, liquid feeders, hexapods, biters/chewers, suckers, piercers, spongers, crustaceans, biters/chewers, piercers/suckers, lickers, suspension feeders. * digestion: primary digestion extracellular, final digestion intracellular. * circulation: open hemocoel: hemolymph, hemocyanin, cells, amoebocytes. Excretion: crustaceans modified (closed) metanephridia, hexapods & chelicerates malpighian tubules: * nervous system: annelid-like, brain suprenteric cerebral ganglion, sense organs, tactile, chemoreceptors, statocysts / georeceptors, phonoreceptors, proprioceptors, photoreceptors .
