Dekayia

Classification
Phylum: Bryozoa
Class: Stenolaemata
Order: Trepostomatida
Family: Heterotrypidae
Genus: Dekayia Milne-Edwards & Haime, 1851
Cincinnatian species:
Dekayia aspera, Dekayia ulrichi

 

Taxonomic Details

Type Species: Dekayia aspera (Milne-Edwards & Haime, 1851)Species found in the Cincinnatian (Bryozoa.net)

  • Dekayia angularis (Ulrich & Bassler, 1904)
  • Dekayia appressa (Ulrich, 1883)
  • Dekayia aspera (Milne-Edwards & Haime, 1851 )
  • Dekayia asperula (Ulrich, 1882)
  • Dekayia catenulata (Cumings & Galloway, 1913)
  • Dekayia crassa (Bassler, 1927)
  • Dekayia crenulata (Prantl, 1940)
  • Dekayia epetrima (Karklins, 1984)
  • Dekayia frankfortensis (Ulrich & Bassler, 1904)
  • Dekayia inflecta (Ulrich, 1890)
  • Dekayia maculata (James, 1881)
  • Dekayia magna (Cumings, 1901)
  • Dekayia mesospinosa (Brown & Daly, 1985)
  • Dekayia multispinosa (Ulrich, 1882)
  • Dekayia nicklesi (Ulrich & Bassler, 1904)
  • Dekayia offula (Ulrich & Bassler, 1904)
  • Dekayia pelliculata (Ulrich, 1882)
  • Dekayia pulaskiensis (Ruedemann, 1925)
  • Dekayia semipilaris (Ulrich, 1890)
  • Dekayia stidhami (Ulrich, 1890)
  • Dekayia sugarensis (Ross, 1969)

Taxonomic History (Nickles & Bassler, 1900)

  • 1851 Dekayia Milne-Edwards and Haime, Pol. Foss. Terr. Pal., p. 277.
  • 1860 Dekayia Milne-Edwards, Hist. Nat. des Corall., III, p. 283.
  • 1879 Dekayia Nicholson, Pal. Tabulate Corals, p 291.
  • 1881 Dekayia Nicholson, Genus Monticulipora, p. 98.
  • 1882 Dekayia Ulrich, Jour. Cincinnati Soc. Nat. Hist., V, p. 155; ibid., VI, 1883, p. 148 .
  • 1886 Dekayia Waagen and Wentzel, Pal. Indica, Ser. XIII, p. 874.
  • 1888 Dekayia James and James, Jour. Cincinnati Soc. Nat. Hist., XI, p. 28.
  • 1889 Dekayia Miller, North American Geol. Pal., p. 184.
  • 1890 Dekayia Ulrich, Geol. Surv. Illinois, VIII, pp. 371, 415.
  • 1893 Dekayia Ulrich, Geol. Minnesota, III, p. 274.
  • 1896 Dekayia Ulrich, Zittel’s Textb. Pal (Engl. ed.), p. 273.
  • 1896 Dekayia J.F. James, Jour. Cincinnati Soc. Nat. Hist., XVIII, p. 115.
  • 1897 Dekayia Simpson, Fourteenth Ann. Rep. State Geologist New York for the year 1894, p. 578.

Stratigraphic Occurrences

Dekayia_Strat

Geologic Range
Ordovician

Geographic Occurrences

Stratigraphic Distribution

Sequences (Formations)

  • C5 Sequence (Saluda, Lower Whitewater)
  • C4 Sequence (Arnheim)
  • C3 Sequence (Mt. Auburn, Corryville)
  • C2 Sequence (Bellevue, Miamitown, Fairview: Fairmount, Mt. Hope)
  • C1 Sequence (Clays Ferry/Kope: McMicken)

Identification in Hand Sample:
Dekayia

  • Zoarium Morphology: Ramose, encrusting, or massive
  • Zoecia: Zooecial walls crenulated; acanthopores present
  • Mesozooids: Rare or absent between monticules
  • Monticules: Low

Species Differentiation

Published Description

Steven Holland (UGA Strat Lab, 2013):

  • Dekayia may be ramose, encrusting, or massive, typically with low or flush monticules. Diaphragms typically absent in endozone and are also either absent or widely spaced in exozone. Zooecial walls are crenulated to undulatory for their entire length, but especially so at the zooecial bend; walls also show irregular thickenings in exozone. Mesozooids are commonly rare or absent between monticules, and they are typically beaded. Dekayiabears styles, which may start in both endozone and exozone, lie at zooecial corners (rarely between corners), and typically terminate within the exozone. A few species also have styles that originate in the exozone, lie between zooecial corners, and that are offset from the zooecial walls.

Karklins (1984):

  • Boardman and Utgaard (1966, p. 1103) redescribed the genus and amended its definition; their definition is followed herein.

McFarlan (1931):

  • Distinguished from Heterotrypa

Nickles & Bassler (1900):

  • Dekayia Milne-Edwards and Haime: Zoarium erect, ramose; zooecia with few diaphragms; acanthopores usually large; mesopores few or wanting.

D. aspera


D. ulrichi