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A new runner-like cyclostome bryozoan from the Bromide Formation (Sandbian, Upper Ordovician) of Oklahoma and its phylogenetic affinities

  • Mark A. Wilson (a1) and Paul D. Taylor (a2)

Zigzagopora wigleyensis n. gen. n. sp. is an Upper Ordovician (Sandbian, early Caradoc) cyclostome bryozoan from the Arbuckle Mountains of Oklahoma, USA. It has runner-type colonies characterized by a mostly uniserial, geniculate arrangement of monomorphic zooids that bud alternately left and right, producing a zig-zag pattern of growth. This new genus has calcified interior walls and non-pseudoporous exterior walls. It is thus most likely affiliated with the paleotubuliporine family Sagenellidae, despite superficial similarities with the corynotrypid cyclostomes with which it co-occurs.

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J.R. Carlucci , S.R. Westrop , C.E. Brett , and R. Burkhalter , 2014, Facies architecture and sequence stratigraphy of the Ordovician Bromide Formation (Oklahoma): a new perspective on a mixed carbonate-siliciclastic ramp: Facies, v. 60, p. 9871012.

L.R.M. Cocks , and T.H. Torsvik , 2011, The Palaeozoic geography of Laurentia and western Laurussia: a stable craton with mobile margins: Earth-Science Reviews, v. 106, p. 151.

M.M. Key Jr., 1990, A new family of trepostome bryozoans from the Ordovician Simpson Group of Oklahoma: Journal of Paleontology, v. 64, p. 700724.

P.D. Taylor , and S. Rozhnov , 1996, A new early cyclostome bryozoan from the Lower Ordovician (Volkhov Stage) of Russia: Paläontologische Zeitschrift, v. 70, p. 171180.

P.D. Taylor , and M.A. Wilson , 1994, Corynotrypa from the Ordovician of North America: colony form in a primitive stenolaemate bryozoan: Journal of Paleontology, v. 68, p. 241257.

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Journal of Paleontology
  • ISSN: 0022-3360
  • EISSN: 1937-2337
  • URL: /core/journals/journal-of-paleontology
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