Heterospongia subramosa

Phylum: Porifera
Class: Demospongia
Order: Lithistida
Family: Eospongiidae
Genus: Heterospongia
Species: Heterospongia subramosa Ulrich, 1889

Taxonomic Details

  • 1889 Heterospongia subramosa Ulrich, Amer. Geol., 3, p. 236, 240, fig. 6.
  • 1891 Heterospongia subramosa James, Jour. Cincinnati Soc. Nat. Hist., 14, pt. 1, p. 71.
  • 1895 Heterospongia subramosa Winchell and Schuchert, Geol. Minnesota, 3, pt. 1, p. 79, pl. G, figs. 4-6.
  • Stratigraphic Occurrences

    Geographic Occurrences

    Map point data provided by iDigBio.

    Stratigraphic Description

    Sequences (Formations)

    • C4 (Arnheim)
    • C2 (Fairview)

    Identification in Hand Sample

    • Composed of cylindrical or compressed branches
    • Twiglike form and moderately open small canals
    • Subramose or palate form
    • Irregularly distributed canal apertures
    • Undetermined spiculae

    Heterospongia subramosa from the Richmond Formation of Lebanon, Kentucky (CMC 7034)

    Published Description

    Fossils of Ohio (1996):

    • Ulrich, showing characteristic twiglike form and moderately open small canals.

    McFarlan (1931):

    • Sponge subramose, of cylindrical or compressed branches up to 30 mm. or more in width. Its general features are shown in the accompanying figures.

    James (1891):

    • Sub-ramose or palmate; branches more or less flattened, from 9 to 13 mm. thick and from 11 to 30 mm wide; surface generally even, with irregularly distributed canal apertures; these of varying size, the average diameter being 0.7 mm., with five in five mm.; space between apertures varying from 0.2 mm. to 1.2 mm.; sponge skeleton composed of more or less loosely interwoven fibers, though the interspaces generally appear solid and structureless; spiculae undetermined.