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Phylum Arthropoda. Jointed appendages Exoskeleton Bilateral symmetry Open Circulatory System Well developed nervous system with a Brain Well developed muscles. Subphylum Uniramia. Unbranched appendages. Subphylum Uniramia. Unbranched appendages Jaws. Jaws. Subphylum Uniramia.
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Phylum Arthropoda • Jointed appendages • Exoskeleton • Bilateral symmetry • Open Circulatory System • Well developed nervous system with a Brain • Well developed muscles
Subphylum Uniramia • Unbranched appendages
Subphylum Uniramia • Unbranched appendages • Jaws
Subphylum Uniramia • Unbranched appendages • Jaws • One pair of antennae
Class Insecta • Six walking legs • Three body sections
Class Chilopoda • Has many body segments • Each segment has one pair of legs • Centipedes
Class Diplopoda • Each segment has two pairs of legs • millipedes
Subphylum Chelicerata • Specialized Mouth Parts: • Chelicerae • Move up & down (stab) • Often have fangs • Pedipalps (used to grab prey)
Pedipalps Chelicerae with Fangs
Subphylum Chelicerata • Specialized Mouth Parts • 2 body sections cephalothorax abdomen
Class Arachnida 8 Walking Legs
Spiders 8 Simple eyes Silk glands
Tarantula Chelicerae
Tick under a microscope Chelicerae
Class Merostomata Horseshoe Crab Only living member of this class
Horseshoe Crab Compound eyes Book gills