2011L Lec8 Arthro I Sp08

2011L Lec8 Arthro I Sp08 - Quic kTim eTM and a TIFF (Unc om...

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Phylum Arthropoda (“joint-limbed” animals) QuickTime and a TIFF (Uncompressed) decomp are needed to see this picture QuickTime and a TIFF (Uncompressed) decompr are needed to see this picture QuickTime and a TIFF (Uncompressed) decompr are needed to see this picture QuickTime and a TIFF (Uncompressed) decompr are needed to see this picture QuickTime and a TIFF (Uncompressed) de are needed to see this p
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millipedes QuickTimeW and a TIFF (Uncompressed) dec are needed to see this pic centipedes QuickTimeW and TIFF (Uncompressed) dec are needed to see this pic insects QuickTimeW and a TIFF (Uncompressed) decompressor are needed to see this picture. crustaceans (the best…) trilobites (extinct) QuickTimeW and a TIF (Uncompres ed) decompres or are ne ded to se this picture. Some representative arthropods… QuickTimeW and a TIFF (Uncompressed) decompressor are needed to see this picture. QuickTimeW an TIFF (Uncompressed) are needed to see thi QuickTimeW and a TIFF (Uncompressed) dec are needed to see this pic QuickTimeW TIFF (Uncompress are needed to see QuickTimeW and a TIFF (Uncompressed) decompressor are needed to see this picture. spiders QuickTimeW and a TIFF (Uncompres ed) decompres or are ne ded to se this picture. ticks QuickTimeW and a TIFF (Uncompressed) decompressor are needed to see this picture. mites QuickTimeW and a TIFF (Uncompres ed) decompres or are needed to see this picture. QuickTimeW and TIFF (Uncompressed) de are needed to see this p horseshoe “crabs” pycnogonids (“sea spiders”) QuickTimeW and a TIFF (Uncompres ed) decompres or are needed to see this picture. scorpions
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QuickTime and a TIFF (Uncompressed) decompr are needed to see this picture Arthropoda largest phylum of animals include over 1,100,000 species about 80% of all known animal species belong to the Arthropoda insects (subphylum Uniramia) account for almost all arthropod species diversity cause significant economic losses estimated to be 200 million insects alive for every human today found in all major environments: from the deepest parts of the oceans to the tops of the highest mountains trilobites (extinct) represent the oldest known examples of arthropods QuickTime and a TIF (Uncompres ed) decompres or are ne ded to se this picture.
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annelid ancestor?
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* evolutionary relationships between the arthropods and the other phyla uncertain and in flux… annelid ancestor?
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coelomates Bilaterial /Triploblastic Characters shared with other phyla not unique to annelids and arthropods: annelid ancestor? coelomate triploblastic protostomate bilateral symmetry
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metameric segmentation and how segments develop (e.g., in a posterior budding zone during development) paired appendages on segments double ventral nerve cord with metameric ganglia a cuticle secreted by hypodermis tissue Evidence: Traditional view: arthropods evolved from a polychaete-like (metameric) annelid ancestor that developed appendages on every segment, followed by segments fusing together for specialized functions (= “ tagmosis ”).
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2011L Lec8 Arthro I Sp08 - Quic kTim eTM and a TIFF (Unc om...

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