#2 - Arthropods Exoskeleton Joint appendages Segmented body...

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Arthropods Exoskeleton Joint appendages Segmented body Ventral nerve cord Dorsal heart Body cavity- haemocoelous type Subphylum o Trilobita 3 lobes 600-650mya marine antenna 1 pair very old and round shaped o Chelicerata Antennae are used for feeding Terrestrial Mouthparts are chelicerae – 2 antennae Walking legs 5-6 pairs Front legs are mortified walking legs for sensory o Crustacea 2 tagmenta appendages branched walking and swimming legs 2 antennae compound eyes mouthparts- mandible mostly marine o Libiata Orders o Scorpiones – imperial scorpion o Araneae – wolf spider o Opiliones – daddy longlegs o Decopoda – crabs lobsters shrimp o Diplopoda – millipedes o Chilopoda – centipedes o Cirripedia – barnacles Class Insecta 10 quintillion insects at any given moment 72-80% of all living animals 51% of all living things total number of species 3-50 million Hexopods
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o Largest group o 3 pairs of legs o head-thorax-abdomen Phylum Enchinodermata 6000 species Crinodia o Ancient (Cambrian Explosion) o Filter Feeders o Sea lilies o Feather stars o Heavly armored o Attached to stalks o Separate sexes Asteroidea o Starfish o Ecology Scavengers/predators Immobile prey Stomach everted o Stylasterais Predators catch prey with pedicellaria o Asteroid Regeneration/Reproduction Regenerate from central disk Asexual reproduction from a single arm Sexual Reproduction free spawners Echinoidea o Sea Urchins Lack arms Spherical or flattened Free spawners Rigid skeleton (rigid test) Ecology Foraging Grazers algae Aristotle’s lantern- 5 calcareous jaws Ophiuroidea o Brittle stars and basket stars o Arms distinct from disk Arms don’t have tube feet, mover for locomotion o Reproduction Regeneration Asexual fission Sexual Holothuroidea o Sea cucumbers
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Bilateral Organs in sets of 5 Tube feet Discharge sometimes toxic repellent Concentricycloidea o Sea daisys Phylum Chordata Dorsal Hollow nerve cord Notochord Pharyngeal slits Post anal tail 2000 species of invertebrates Urochordata (tunicates) o Filter feeders o Notochord only present in larval stage Cephalochordata (lancelets) o long narrow body o marine o notochord Fishes Classes Lamprey o Jawless o Migrates to freshwater to breed o Notochord o Oldest group all jawless Hagfish o Jawless o eel like o scavenger o lacks a bony skeleton o Migrates to freshwater to breed Chondrichthyes (cartilaginous fishes) o Sharks skates and rays o skin made of 1000s of interlocking scales o give live birth o all are carnivorous Osteichthyes (bony fishes) o Lungfishes (3 species) o Coelacanth (2 species) o Teleost fishes o 20000 species o Sub Class Sarcopterygians
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Fleshy finned fishes Closest relatives to 4 leg walking animals Eel like have gills and 1 or 2 primitive lungs
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This note was uploaded on 01/30/2012 for the course BIOL 135 taught by Professor Staff during the Fall '09 term at Washington State University .

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#2 - Arthropods Exoskeleton Joint appendages Segmented body...

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