Bryozoans appear in the fossil record in the Lower Ordovician but might be found in Late Cambrian. They are colonial animals, dominantly marine. (Freshwater species have an organic skeleton that doesn’t preserve in the fossil record.) Bryozoans are difficult to identify because the internal structure is used. However, some bryozoans have distinctive exterior features.
Bryozoan Photos (more to be added)
Archimedes is the central axis of a fenestrate bryozoan. Specimens are often found in matrix.
Preservation: C = Calcified, Ph = Phosphatic, P = Pyritized, S =Silicified, 1= w/o, matrix, 2 = w/ matrix
# No specimens for sale
BRYOZOANS Period Location Preservation
Amplexopora septosa Upper Ordovician KY C,1,2
Anastomopora adnata (Hall)# – Jeffersonville Limestone, Middle Devonian, KY – C, 2
Archimedes communis Upper Mississippian KY C,1
Archimedes confertus Ulrich – Glen Dean Fm., Upper Mississippian, KY – C,1,2
Archimedes distans Ulrich – Glen Dean Fm., Upper Mississippian, KY – C,1,2
Archimedes intermedius Ulrich – Glen Dean Fm., Upper Mississippian, KY – C,1,2
Archimedes invaginatus Ulrich – Glen Dean Fm., Upper Mississippian, KY – C,1,2
Archimedes laxus ” ” KY C,1
Archimedes macfarlani ” ” KY C,1,2
Archimedes meekanoides McFarlan – Glen Dean Fm., Upper Mississippian, KY – C,1,2
Archimedes meekanus Hall – Glen Dean Fm., Upper Mississippian, KY – C,1,2
Archimedes proutanus Ulrich – Glen Dean Fm., Upper Mississippian, KY – C,1,2
Archimedes sp. ” ” IN,AL C,1,2
Aspidopora newberryi (Nicholson)# – a small encrusting species, Upper Ordovician, IN, KY – C1,2
Batostoma gracilis Upper Ordovician KY,IN C,1
Batostoma jamesi ” ” KY C,1
Batostoma varians ” ” KY,IN C,1
“Chaetetes” consimilis Hall# – current name unknown, flattened fronds. Waldron Shale, Silurian, IN – C,2
Cheilotrypa hispida Ulrich – very small branching bryozoan, Glen Dean Fm., Upper Mississippian, KY – C,1,2
Chondaulus ponderosa (Rominger) – a massive species in the Jeffersonville Ls., Middle Devonian, IN, KY – C,1,2
Constellaria florida Ulrich – with star-shaped monticules, this genus is very distinctive. Occurs most frequently in flat fronds. Six species in the Upper Ordovician, IN, KY – C,1,2
Cyphotrypa clarksvillensis McFarlan# – a massive, often hemispherical trepostome bryozoan of the Upper Ordovician, IN, KY – C,1
Cystodictya lineata Ulrich – flat fronds, Salem Limestone, Middle Mississippian, KY,IN – C,1,2
Dekayia sp. – Branching bryozoan in the Upper Ordovician, IN, KY – C,1,2
Eridotrypa macrostoma Upper Mississippian KY C,1,2 on crinoids columns
Eridotrypa sp. Middle Devonian IN C,1,2
Evactinopora radiata Meek & Worthen# – a star-shaped bryozoan from the Fern Glen Formation in Missouri, MO – C,1,2
Fenestella depressa Hall# – in the Jeffersonville Limestone, Middle Devonian. KY – S,2
Fenestella acmea Hall – the Waldron species with smaller fenestrules. Middle Silurian, IN – C1,2
Fenestella multispinosa Ulrich – Glen Dean Fm., Upper Mississippian, KY – C,1,2
Fenestella parvulipora Hall – the Waldron species with larger fenestrules. Middle Silurian, IN – C1,2
Fenestella sp. (pyrite-replaced) – from the Coral Ridge fauna, basal Borden Fm., Middle Mississippian.
Fenestella tenax Ulrich – Glen Dean Fm., Upper Mississippian, KY – C,1,2
Fistulipora concentrica Hall – flat to irregular Waldron Shale species. Can get large. Middle Silurian, IN – C,2
Fistulipora spergenensis Hall – abundant bryozoan in Salem Ls., with monticules, Middle Mississippian, IN, KY – C,1,2
Fistulipora sp. – a common genus spanning the Paleozoic. Abundant in the Upper Mississippian, AL, IN, KY – C,1,2
Fistulipora sp. Middle Devonian IN,KY C,2
Glyptopora michelinea Prout # – a rare, distinctive bryozoan that superficially resembles the tabulate coral Michelinea. IN, KY – C,1
Hederella sp. on other fossils Silurian – Mississippian in IN, KY, etc. – C,2
Heterotrypa subfrondosa Cumings – flattened fronds, large, with monticules. Numerous species of Heterotrypa in the Upper Ordovician, KY – C,1,2
Homotrypa dawsoni ” ” KY C,1
Homotrypa flabellaris ” ” KY,IN C,1
Homotrypella hospitalis (Nicholson) – massive, often hemispherical, Upper Ordovician, IN, KY – C,1
Lioclema sp. – often encrusting other fauna. Silurian – Mississippian, KY, TN – C,2
Lyroporella ovalis Upper Mississippian KY C,1
Lyroporella quincuncialis (Hall)# – fenestrate with a curving base. Upper Mississippian, AL, IN, KY – C,1,2
Monticulapora mammulata Upper Ordovician KY C,1
Meekopora exigua Upper Mississippian KY C,1
Parvohallopora oneilli (James) – common in Kope Fm., Upper Ordovician, where storm-shattered colonies are common. IN, KY – C,1,2
Parvohallopora ramosa ” ” KY,IN C,1
Parvohallopora subfrondosa ” ” KY C,1
Peronopora vera ” ” KY C,2
Polypora spp. Middle Devonian KY C,2
Polypora cestriensis Middle & Upper Mississippian KY,IN C,1,2
Polypora corticosa Ulrich – Glen Dean Fm., Upper Mississippian, KY – C,1,2
Polypora multispinosa Ulrich – Glen Dean Fm., Upper Mississippian, KY – C,1,2
Prasopora simulatrix Upper Ordovician KY C,2
Prismopora serratula Ulrich – triangular in cross-section, it’s uncommon and small. Glen Dean Fm., Upper Mississippian, KY – C,1,2
Rhopalonaria venosa? Upper Ordovician KY,IN C,2
Saffordotaxis incrassata Middle Mississippian KY C,1 (very small)
Septopora subquadrans Ulrich – easy to identify with “frowning” fenstrules. Glen Dean Fm., Upper Mississippian, IN, KY – C,1,2
Stromatopora sp. Upper Ordovician KY C,2
Tabulipora ramosa Ulrich Upper Mississippian IN, KY C,1,2
Trematopora sp.# – unknown if this has an updated name, Waldron Shale, Silurian, IN – C,1,2
Unidentified disks Middle Devonian IN S,1