Phylum: Bryozoa
Class: Stenolaemata
Order: Trepostomatida
Family: Batostomellidae
Genus: Bythopora Miller & Dyer, 1878
Cincinnatian Species: Bythopora arctipora, Bythopora gracilis, Bythopora meeki

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Type Species: Bythopora fruticosa (Miller & Dyer, 1878)

Species found in the Cincinnatian (

  • Bythopora arctipora (Nicholson, 1875)
  • Bythopora dendrina (James, 1878)
  • Bythopora meeki
  • Bythopora delicatula
  • Bythopora dendrina
  • Bythopora parvula
  • Bythopora striata

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Stratigraphic Occurrences


Geologic Range

Geographic Occurrences

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Sequences (Formations)

  • C5 Sequence (Lower Whitewater, Waynesville)
  • C4 Sequence (Arnheim: Oregonia, Sunset)
  • C3 Sequence (Corryville)
  • C2 Sequence (Bellevue, Fairview: Fairmount)
  • C1 Sequence (Clays Ferry/Kope: McMicken, Southgate, Economy/Fulton)

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Identification in Hand Sample:

  • Zoarium Morphology: Ramose; usually slender, but sometimes larger
  • Zoecia: Oblique apertures, narrowing above; acanthopores strong, usually one per zooecia (never numerous)
  • Mesozooids: Few
  • Monticules: N/A
  • Maculae: N/A
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Treatise on Invertebrate Paleontology, Part G (1953):

  • Very slender branching stems. Zooecia with thin mature region, oblique apertures, thick channeled interspaces.

McFarlan (1931):

  • Genus: Zooarium of smooth, slender branches, with small oblique zooecia, the apertures narrowing above and with channeled interspace. Mesopores few. Acanthopores never numerous

Bassler (1911):

  • Species of Bythopora are uncommon in American Middle Ordovician strata and seem equally scarce in Russia, the following B. subgracilis being the only one so far discovered in the rocks of the latter country. The zoarium in Bythopora consists of slender branches with small, oblique, zooecial apertures narrowing above. The zooecial interspaces are generally thick and are channeled. Mesopores and diaphragms are few or wanting and acanthopores are never numerous. At the surface the channeled interspaces and elongate aperture are characteristic.
  • Genotype.—Bythopora fruticosa Miller and Dyer. Upper Ordovician (Maysville) of the Ohio Valley.

Nickles & Bassler (1900):

  • Bythopora Miller and Dyer: Zoarium ramose, branches usually slender, sometimes of considerable size; zoecia practically without diaphragms; apertures oblique, narrowing above; interspaces caniculate; mesopores few; acanthopores comparatively strong, rarely more than one to each zooecium, sometimes wanting

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B. arctipora

B. gracilis

B. meeki