page_title: List of the Paleozoic life of Iowa
section_title: B
hierarchical_section_title: List of the Paleozoic life of Iowa / B
caption_attribution_description: English: Cropped version of File:Trilobite_-_Bumastus_reconstruction_3d_scene.jpg 3d reconstruction of the trilobite Bumastus. Created with ZBrush, 3dsmax 2010, and GIMP
context_page_description: This list of the Paleozoic life of Iowa contains the various prehistoric life-forms whose fossilized remains have been reported from within the US state of Iowa and are between 541 and 252.17 million years of age.
context_section_description: Bairdia
  †Bairdiocypris
  †Bairdiocypris granti
  †Bairdocypris
  †Bairdocypris granti
  †Basseleratia
  †Basseleratia typa
  †Bassleratia
  †Bassleratia typa
  †Batostomella
  †Baylea
  †Baylea trifibra – type locality for species
  †Beecheria
  †Beecheria chouteauensis
  †Belemnocrinus
   †Bellerophon
  †Bellerophon blairi
  †Bellerophon panneus
  †Bellerophon patersoni
  †Bellerophon vinculatus
  †Bellornatia
  †Bellornatia tricollis
  †Belodina
  †Belodina compressa
  †Beloitoceras – tentative report
  †Beloitoceras discrepana
  †Bembexia
  †Bembexia minima
  †Bensbergia
  †Bensbergia pulchra – type locality for species
  †Beyrichia
  †Beyrichia irregularis
  †Bighornia
  †Blothrocrinus
  †Bobbodus
  †Bobbodus schaefferi
  †Bolicrinus
  †Bolicrinus deflatus
  †Bolicrinus globosus
  †Bollia
  †Bollia regularis
  †Bollia ruthae
  †Bollia subaequata
   †Bothriocidaris
  †Bothriocidaris maquoketensis
  †Botryocrinus
  †Botryocrinus thomasi – type locality for species
  †Brachythyris
  †Brachythyris burlingtonensis – or unidentified comparable form
  †Brachythyris chouteauensis
  †Brachythyris peculiaris
  †Brachytomaria
  †Brachytomaria semele
  †Breviphillipsia
  †Brockocystis
  †Brockocystis nodosaria
  †Bromidella
  †Bromidella depressa
  †Bromidella rhomboides
  †Bryantodina
  †Bryantodina typicalis
  †Bucanella
  †Bucanella conradi
  †Bucanopsis
  †Bucanopsis lirata
  †Bullatekka
  †Bullatekka granilabiatus
  †Bullatella
  †Bullatella granilabiatus
   †Bumastus
  †Buranella
  †Buxtonia – tentative report
  †Byrsolopsina
  †Byrsolopsina centipunctata
  †Byrsolopsina normella
  †Byrsolopsina ovata
  †Byrsolopsina planilateralis
  Bythocypris
  †Bythocypris curta
  †Bythocypris furnishi
caption: Life restoration of the Early Ordovician-Silurian trilobite Bumastus
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