Arthropods

Arthropods - ARTHROPODS Arthropods Most diverse phylum -...

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ARTHROPODS
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Arthropods Most diverse phylum - > 85% of all species All habitats – esp. extremes Segmented body w jointed appendages Chitin (polysaccharide) exoskeleton good protection requires molting prohibits large size
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Phylum Arthropoda Subphylum Trilobitomorpha – Trilobites (Camb-Perm) Subphylum Chelicerata – Arachnids, Horseshoe crabs, Eurypterids (Ord-R) Subphylum Crustacea – Lobsters, crabs, shrimp, barnacles, ostracodes (Camb–R) Subphylum Tracheata (Unirama) – Insects (Dev–R)
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Trilobites Cranidium = cephalon missing free cheeks
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Sutures Opisthoparian Proparian Gonatoparian underside
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Biramous legs
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Trilobite eyes A. compound (holochroal) eyes B. schizochroal eyes Huygens lens corrects spherical aberration
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Phylum Arthropoda Subphylum Trilobitomorpha Class Trilobita Order Agnostida (Camb-O) Order Redlichiida (Camb) Order Corynexochida (Camb) Order Ptychopariida (Camb-O) Order Asaphida (Camb-O) Order Illaenida (O-D) Order Trinucleida (O-S) Order Harpida (Camb-D) Order Phacopida (O-D) Order Lichida (O-D) Order Odontopleurida (O-D) Order Proetida (Camb-P)
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Arthropods - ARTHROPODS Arthropods Most diverse phylum -...

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