Escharopora pavonia

Phylum: Bryozoa
Class: Stenolaemata
Order: Cryptostomata
Genera: Escharopora
Species: Escharopora pavonia (D’Orbigny)

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History (Nickles & Bassler, 1900)

  • 1849 Ptilodictya pavonia D’Orbigny, Prodr. de Pal., I p. 22
  • 1851 Chaetetes pavonia Milne-Edwards and Haime, Pol. Foss. Terr. Pal., p. 267, pl. xix, 4, 4a.
  • 1859 Cyclopora jamesii Prout, Trans. St. Louis Acad. Sci., I, p. 578.
  • 1860 Monticulipora pavonia Milne-Edwards, Hist. Nat. des Corall., III, p. 276.
  • 1866 Chaetetes pavonia Rominger, Proc. Acad. Nat. Sci. Philadelphia, p. 116.
  • 1871 Stictopora clathratula James, Catal. Foss. Cincinnati Group. (Not defined).
  • 1874 Chaetetes? clathratulus Nicholson, Quar. Jour. Geol. Soc. London, XXX, p. 509, pl. xxx, 1-1b.
  • 1875 Chaetetes? clathratulus Nicholson, Pal. Ohio, II, p. 209, pl. xxii, 2-2b.
  • 1876 Chaetetes? clathratulus Nicholson, Ann. Mag. Nat. Hist., ser. 4, XVIII, p. 91, pl. v, 9, 9a.
  • 1880 Heterodictya pavonia Ulrich, Catal. Foss. Cincinnati Group, p. 10.
  • 1881 Chaetetes pavonia Quenstedt, Roehren-und Sternkorallen, p. 79, pl. cxlvi, 21-25.
  • 1881 Monticulipora (Monotrypa) pavonia Nicholson, Genus Monticulipora, p. 195, fig. 41, pl. vi, 3, 3a.
  • 1882 Ptilodictya pavonia Ulrich, jour. Cincinnati Soc. Nat. Hist., V, p. 163, pl. vii, 3-3d
  • 1886 Nicholsonia pavonica Waagen and Wentzel, Pal. Indica, Ser. XIII, p. 874. Cincinnati (Lorraine): Cincinnati, Ohio, and vicinity
  • 1888 Monticulipora pavonia James and James, Jour. Cincinnati Soc. Nat. Hist., XI, p. 18.
  • 1893 Escharopora pavonia Ulrich, Geol. Minnesota, III, p. 167.
  • 1895 Monticulipora pavonia J.F. James, Jour. Cincinnati Soc. Nat. Hist., XVIII, p. 70.
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Stratigraphic Occurrences


Geographic Occurrences

Map point data provided by iDigBio.
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Sequences (Formations)

  • C2 Sequence (Fairmount)

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Identification in Hand Sample
E. pavonia

  • Zoarium Morphology: Unbranching, simple “frond”
  • Zoecia: Sub-elliptical; arranged diagonally in intersecting series (angles between 50* and 80*)
  • Mesozooids: Few
  • Monticules: Prominent, raised; form transverse ridges across frond, giving the surface a “wrinkled” appearance

Diagnosis: Wide, robust fronds that irregularly expand in comparison to E. maculata (Bassler)

Escharopora pavonia from the Maysville-Fairmount Formation of Cincinnati, Ohio (CMC 13101)

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Holland (UGA Strat Lab, 2013):

  • Forms broad fronds

Bassler (1906):

  • James’s name Stictopora clathratula was published without description and therefore a nomen nudum. As indicated above, Nicholson described the species using James’s specific name, and as his descriptions are based on typical Escharopora pavonia, James’s name is also synonymous with this species.
  • D’Orbigny’s species is distinguished from the other forms of Escharopora by its broad zoarium. It is a common fossil and is found at most localities in Ohio, Kentucky, Indiana, and Tennessee where the beds of the Fairview formation are exposed.

Ulrich (1880):

  • Corallum forming a thin, undulating expansion, often of considerable extent, varying in thickness from one to about two lines, the corallites in two layers with their bases fixed to a medium plane marked by a delicate membrane and opening on opposite sides of the corallum. Surface often with low, rounded monticules, often obscure, and arranged in diagonal rows at intervals of from one to one and a half lines apart, occupied by calices of ordinary size. Corallites generally oblique at their origin, but almost immediately bending outwards, and opening at right angles to the surface or nearly so. Calices elongated, pentagonal, tolerably uniform in size and often arranged in obliquely intersecting lines. No interstitial tubes.

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