page_title: List of the Paleozoic life of Iowa
section_title: H
hierarchical_section_title: List of the Paleozoic life of Iowa / H
caption_attribution_description: English: Hyoliths from the Middle Ordovician of northern Estonia; these are internal molds.
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: †Hadrorhynchia
  †Hadrorhynchia solon
  †Haeretocrinus
  †Haeretocrinus missouriensis
  †Hagnocrinus
  †Hallatia
  †Hallatia convexa
  †Hallatia duplicata
  †Hallatia particylincrica
  †Hallatia particylindrica
  †Hallicystis
  †Halliella
  †Halliella magnipunctata
    †Hallopora
  †Halysiocrinus
  †Halysiocrinus barrisi
  †Halysiocrinus elephantinus – type locality for species
  †Halysites
  †Hammatostroma
  †Hammatostroma albertense
  †Harpidella – tentative report
  †Harpidella brandonensis
  †Harpidium
  †Harpidium luckeyensis – or unidentified related form
  †Harpidium maquoketa
  †Hedeina
  †Heliolites
   †Heliophyllum
  †Heliophyllum solidum
  †Helliella
  †Helliella magnipunctata
  †Hemicystites
  †Hemiphragma
  †Hemiplethorhynchus
  †Hemiplethorhynchus subovatum
  †Hermatostroma
  †Hermatostroma polymorphum
  †Hernodia
  †Hesperidella
  †Hesperidella initialis
   †Hexagonaria
  †Hexagonaria bassleri
  †Hexagonaria inequalis
  †Hexagonaria oweni
  †Hexagonaria whitfieldi
  †Hibbardella
  †Hibbardella subacoda
  †Hindella
  †Hindia
  †Hindia parva – tentative report
  †Hindia sphaeroidalis
  †Holcocrinus
   †Holopea
  †Holopea iowaensis
  †Homacanthus
  †Homacanthus delicatulus
  †Homoeospira
  †Homotrypella
  †Hormotoma
  †Hormotoma gracilis
  †Howellella
  †Hudsonaster
  †Huronia
  †Hustedia
  †Hyattidina
  †Hybocrinus
  †Hybocrinus conicus
   †Hyolithes
  †Hyolithes parviusculus
  †Hypergonia
  †Hypergonia percarinata
  †Hypothyridina
  †Hypothyridina emmonsi
  †Hypothyridina intermedia
  †Hypothyridina magister
  †Hypselocrinus
  †Hypsitycha
  †Hypsitycha hybrida
  †Hysitycha
  †Hysitycha neenah
  †Hystriculina
caption: Fossilized shells of the Cambrian-Permian brachiopod relative Hyolitha
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