Invertebrate Diversity 2

Invertebrate Diversity 2 - No sensory antennae...

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Invertebrate Diversity 2 Phylum Nematoda - roundworms - Non-segmented (contrast annelids) - Logitudinal muscle cords - Alimentary canal (complete gu) - No circulatory system - Ubiquitous, Live in most habitats (e.g. water or soil) - Free living or parasitic (e.g. pinworms or hookworms) Arthropod Diversity - Arthropods represent >85% of animal species - 1018 individuals (10 quintrillion) - 100,000,000,000,000,000,00 - 1.6 Billion per human Phylum Arthropoda - “jointed feet” - All arthropods have the following features: 1. Bilateral Symmetry 2. Segmented body 3. Hard exoskeleton - Desiccation resistent - Made of chitin - Muscle attachment - Molt (ecdysis) 4. Jointed legs 5. Many pairs of limbs 6. Complete gut
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7. Open circulatory system Arthropod Evolution - Arthropods evolved from segmented worms - Over time segments fused and began to specialize Arthropod Diversity - Cheliceriformes - Chelicer: claw-like feeding appendage - Horseshoe crabs, spiders, scorpions, ticks
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Unformatted text preview: - No sensory antennae- Cephalothorax (fused head and thorax) and abdomen- Myriapoda- Millipedes: herbivores; 2 pairs walking legs per segment- Emit hydrogen cyanide gas, monkey perfume- Centipedes: carnivores; 1 pair walking legs per segment- Hexapoda- Hexapods are insects, which possess:- 3 basic body parts (head, thorax, and abdomen)- 3 pair of jointed legs- 2 antennae- Crustacea- Crabs, shrimp, barnacles, lobster- Marine and freshwater (a few terrestrial) Phylum Ecinodermata- “spiny skin”- StarFsh, brittle stars, sea urchins, sea cucumbers, sea feathers- Endoskeleton of calcareous plates- Closely related to chordates- Water vascular system: tube feet- Adults have radial symmetry, larvae are bilateral Water Vascular System- Water Vascular system: hydraulic system of closed tubes Flled with sea water; used for locomotion, food/waste transport and respiration...
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This note was uploaded on 09/21/2011 for the course BSC 2010 taught by Professor Bowes during the Spring '08 term at University of Florida.

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Invertebrate Diversity 2 - No sensory antennae...

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