Batostoma jamesi

Phylum: Bryozoa
Class: Stenolaemata
Order: Trepostomatida
Family: Trematoporidae
Genus: Batostoma
Species: Batostoma jamesi (Nicholson, 1874)

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Taxonomic History (Nickles & Bassler, 1900)

  • 1874 Chaetetes jamesi Nicholson, Quar. Jour. Geol. Soc. London, XXX, p. 506, pl. xxix, 10-10b.
  • 1875 Chaetetes jamesi Nicholson, Pal. Ohio, II, p. 200, pl. xxi, 11, 11a.
  • 1876 Chaetetes jamesi Nicholson, Ann. Mag. Nat. Hist., ser. 4, XVIII, p. 89, pl. v, 5.
  • 1880 Monticulipora jamesi Nicholson, Ann. Mag. Nat. Hist., ser. 5, VI, p. 415, fig. 3A, B, fig. 4.
  • 1881 Monticulipora (Heterotrypa) jamesi Nicholson, Genus Monticulipora, p. 143, figs. 25, 26.
  • 1882 Batostoma jamesi Ulrich, Jour. Cincinnati Soc. Nat. Hist., V, p. 256; ibid., VI, 1883, p. 83.
  • 1883 Monticulipora jamesi (Van Cleve), Hall Twelfth Ann. Rep. Indiana Geol. Nat. Hist., p. 248, pl. xi, 8.
  • 1888 Monticulipora jamesi James and James, Jour. Cincinnati Soc. Nat. Hist., X, p. 176.
  • 1889 Batostoma jamesi Miller, North American Geol. Pal., fig. 457 (p. 294).
  • 1894 Monticulipora jamesi J.F. James, Jour. Cincinnati Soc. Nat. Hist., XVI, p. 197.

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Stratigraphic Occurrences


Geographic Occurrences

Map point data provided by iDigBio.
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Sequences (Formations)

  • C1 Sequence (Clays Ferry/Kope: McMicken, Southgate, Economy/Fulton; Lexington/Pt. Pleasant)

Common in Southgate
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Identification in Hand Sample

  • Zoarium Morphology: Dendroid, with irregularly thickened/nodulose branches; diameter: 5-10mm
  • Zoecia: Circular or oval (~6 in 2mm density); acanthopores small, rather numerous
  • Mesozooids: Separate zooecia
  • Monticules: N/A
  • Maculae: N/A

Batostoma jamesi from the Kope Formation of Covington, Kentucky (OUIP 67)

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Karklins (1984):

  • Description: Zoarium of the single specimen available irregularly dendroid, with subcylindrical branches variable in size; conspecific overgrowths common locally, consisting of one or more layers of zooecia. In endozones, autozooecia gradually curving outward, locally irregular in growth direction. Basal diaphragms sparse to absent, occurring mostly in late endozones. Zones of rejuvenation of autozooecia sparse to absent.In exozones, autozooecia almost at right angles to zoarial surface, subpolygonal to subcircular, occasionally elongated, locally slightly petaloid in cross section, in diameter approximately 0.28-0.34 mm long by 0.20-0.24 mm wide on the average. Autozooecia partly continguous or almost completely separated by mesozooecia. Autozooecial walls approximately 0.11-0.16 mm thick, consisting of poorly defined, indistinct laminae. Autozooecial boundaries exceedingly narrow, well defined. Styles common, approximately four to six per autozooecium, 0.02-0.04 mm in diameter. Style cores distinct, slightly notched or spinose locally, with exceedingly thin sheaths. Styles generally occurring on autozooecial boundaries or slightly outside them, occasionally slightly inflecting autozooecial walls. Basal diaphragms sparse to absent, thin, commonly concave distally, absent in some autozooecia. Single basal diaphragms commonly proximal to base of overgrowths. Autozooecial linings absent. Autozooecial chambers subelliptical to subcircular, occasionally slightly petaloid in cross section. Mesozooecia abundant, irregularly polygonal in cross section, locally having moniloid proximal parts, variable in size. Mesozooecial diaphragms common, irregularly spaced, slightly curved, much thicker distally than proximally, occasionally filling mesozooecia in outer exozones, locally forming cystose structures in inner exozones. Maculae common, scattered, indistinct in cross section, consisting of polymorphs slightly larger than autozooecia and mesozooecia in various combinations. Mesozooecia in maculae commonly filled by thickened diaphragms.
  • Geographic and stratigraphic distribution — The single specimen of B. cf. B. jamesi, hypotype USNM 309302, occurs in the upper part of the Clays Ferry Formation, Edenian Stage (USGS colln. D1188-CO), in central Kentucky.
  • Remarks —The specimen described is similar to B. jamesi (Nicholson), as illustrated by Anstey and Perry (1973, p. 22, pi. 6, figs. 4-6; pi. 7; pi. 8, figs. 1-3), in cross-sectional shape of autozooecia and mesozooecia, abundance and distribution of mesozooecia, general appearance and size of styles, and presence of conspecific overgrowth. B. jamesi, however, possesses autozooecia with distinct linings (the cingula of Anstey and Perry) and relatively numerous basal diaphragms in exozones, characters that appear to be lacking or are not preserved in the available specimen of Batostoma. Because of these differences, poor preservation, and lack of additional material, the single specimen of Batostoma is herein assigned to B. cf. B. jamesi until additional adequately preserved material can be found for further consideration. Anstey and Perry (1973, p. 22, fig. 8) established that B. jamesi ranged through the upper 25 m of their Eden Shale (Kope Formation of current usage) in Kentucky and Indiana and occurred in the middle part of their Eden Shale in their area of investigation in Ohio, and made B. jamesi a zonal index species. The occurrence of B. cf. B. jamesi in the Clays Ferry Formation may indicate, subject to finding of additional material, that the B. jamesi assemblage of Anstey and Perry may have extended into the lower part of the Upper Ordovician strata in central Kentucky.

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