lecture 4 - Arthropods (contd) Subphylum Chelicerta (have...

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Arthropods (cont’d) Subphylum Chelicerta (have chelicerae) Class merostomata – (horseshoe crab) Class arachnidada – Subphylum crustacea – Class malacostraca Subphylum myriapoda (many legs) Class chilopoda – centipedes o First set are poison claws Class dipoda –millipedes o 2 pairs of appendages per segment o Scavengers Subphylum hexapoda Class insecta o 300,000 + species of beetles o More than 70% of animals o Only invertebrates that can fly o Don’t have to give up any of their walking legs o High degree of specialization Phylum onycophora (walking worms) True ceolomates o Though of as possible link between arthropods annelids but possibly much more related to arthropods Coelomate deuterostomes Phylum echinodermata – “spiny skinned” (sea stars, sand dollar, sea cucumber, sea lily) Have spines that project out of internal skeleton Neither open nor closed system No brain Nerve network Consider them bilaterally symmetrical Larve are bilaterally symmetrical
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lecture 4 - Arthropods (contd) Subphylum Chelicerta (have...

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