Batostoma

Classification
Phylum: Bryozoa
Class: Stenolaemata
Order: Trepostomatida
Family: Trematoporidae
Genera: Batostoma Ulrich 1882
Cincinnatian Species: Batostoma jamesi, Batostoma varians

Taxonomic Details

Type species: Monticulipora (Heterotrypa) implicata (Nicholson, 1881)Synonyms: Stromatotrypa Ulrich, 1893

Species in Cincinnatian of Ohio, Indiana, Kentucky (Bryozoa.net)

  • Batostoma? cornula (Cumings & Galloway, 1915)
  • Batostoma jamesi (Nicholson, 1874)
  • Batostoma? maysvillense (Nickles, 1905)
  • Batostoma parcum (Utgaard & Perry, 1964)
  • Batostoma prosseri (Cumings & Galloway, 1912)

Taxonomic History (Nickles & Bassler, 1900)

  • 1882 Batostoma Ulrich, Jour. Cincinnati Soc. Nat. Hist., V, p. 154.
  • 1883 Batostoma Foord, Contr. Micro-Pal. Cambro-Sil., p. 17.
  • 1889 Batostoma Miller, North American Geol. Pal., p. 294.
  • 1890 Batostoma Ulrich, Geol. Surv. Illinois, VIII, pp. 379, 459.
  • 1893 Batostoma Ulrich, Geol. Minnesota, III, p. 288.
  • 1896 Batostoma Ulrich, Zittel’s Textb. Pal. (Engl. ed.), p. 275.
  • 1897 Batostoma Simpson, Fourteenth Ann. Rep. State Geologist, New York, for the year 1894, p. 588.

Stratigraphic OccurrencesBatostoma_strat

Geologic Range
Early Ordovician – middle Silurian

Geographic Occurrences

Stratigraphic Distribution

Sequences (Formations)

  • C5 Sequence (Saluda, Lower Whitewater, Liberty, Waynesville)
  • C4 Sequence (Arnheim)
  • C3 Sequence (Dillsboro)
  • C2 Sequence (Fairview: Mount Hope)
  • C1 Sequence (Clays Ferry/Kope: McMicken, Southgate, Economy/Fulton; Lexington/Pt. Pleasant)

Identification in Hand Sample:

  • Zoarium Morphology: Irregularly ramose, branches arising from a large base
  • Zoecia: Thin-walled in immature areas, thickened appearing ring-like in mature areas; acanthopores usually large and abundant, sometimes few
  • Mesozooids: Numerous to few (variable); irregular in size and shape
  • Monticules: Surface smooth

Published Description

Holland (UGA Strat Lab, 2014):

  • Batostoma may be ramose or encrusting and typically bears low monticules. Zooecia are round to oval and almost completely separated by polygonal mesozooecia, often with beaded tips. Diaphragms in exozone are thin and irregularly spaced. Styles vary in size and abundance, often inflecting and centered along zooecial walls.

Bassler (1911):

  • This genus is most prolific both in species and specimens but seems to be limited to Ordovician strata and to the Richmond formation of the earliest Silurian. In America, no less than a dozen species have been described from the Middle Ordovician alone, and a number of new forms are known. Four of these same forms occur in the Russian deposits with a few new species. The essential characters of the genus are embodied in the following description:
    • Zoarium irregularly ramose, branches arising from a large basal expansion; zooecia with walls that are thin in the immature region, much thickened and in sections appearing ring-like (but seldom in contact) in mature region; diaphragms present; mesopores numerous or few, irregular in size or shape; acanthopores usually of large size and abundant, sometimes few.
  • Genotype.—Monticulipora (Heterotrypa) implicate Nicholson. Upper Ordovician (Eden) of the Ohio Valley.

Nickles & Bassler (1900):

  • Batostoma Ulrich: Zoarium irregularly ramose, branches arising from a large basal expansion; zooecia with walls that are thin in the immature region, much thickened and in sections appearing ring-like (but seldom in contact) in mature region; diaphragms present; mesopores numerous or few, irregular in size and shape; acanthopores usually of large size and abundant, sometimes few.

Foord (1883):

  • Irregularly ramose, with a large basal expansion, by means of which the zoarium is attached to foreign bodies. Cell-apertures in the outer portion of the branches irregularly ovate to circular, and surrounded by a distinct ring-like wall. Interstitial tubes more or less numerous, very irregular in shape and size. Spiniform tubuli numerous and well developed.

B. jamesi


B. varians