Fossil Arthropods (565)

adult ages agricultural ancestor animal animals annelids appearance appendage aquatic arthropod arthropoda arthropods bacteria barnes billion bioimmuration biological biology biramous bodies bone brain branch brooks bryozoan budd burgess cambrian carboniferous cell chelicerata chelicerates chemical classification closely closest codex cole combination commonly commons compound consist consists contact contents cord crab crustacea crustacean current cuticle cuticles darwin dating details detect devonian discoveries diseases diverse diversity earliest ecdysozoa ecological eggs embryos endocuticle entomology epicuticle epidermis event evolution evolutionary evolved excretory exocuticle exoskeleton explanation extant external extinct extremely faunal features female fertilization formation formed fossil fossiliferous fossilization fossilized fossils fox ganglia geological geology gill gills gould grouped hardened hemocoel hexapods hole honey horseshoe hou humans hypothesis insect insects interaction internal invertebrate jointed journal jurassic kentucky layer leg legs leonardo limb lobsters london lophotrochozoa marrella mechanical microfossils microscopic minerals mite modified mold molecular molting mouth muscle mx myriapoda myriapods navigation nerve nervous ocelli older oldest onychophorans ordovician organism organs origin original oxygen pair palaeontology paleontology permineralization pest phase phyla phylogenetic phylogeny pigment plants portal preservation preserved princeton processes produce proterozoic pseudofossils rarity relationship relative rely remains repeated replacement reproduction resin respiratory retrieved review rigid rock ruppert scale science sciences scientific scorpion sea search sediment segment segmentation segmented segments sensor sequence setae shale shells shrimp silurian sites skeletal soft source specialized species sperm spider strata stromatolite structure studies subphylum succession superphylum supply tardigrades taylor teeth terrestrial tissue trace tree trilobite trilobites upper vertebrate views vinci water wiley worm zoology