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Stromatocerium
Classification
Phylum:
Porifera
Class:
Stromatoporoidea
Order:
Labechiida
Superfamily:
Unknown
Family:
Stromatoceriidae
Formal Genus Name and Reference:
Stromatocerium bigsbyi (WEBBY, 1979b)
Type Species:
S. rugosum Hall, 1847, pl. 12,2; M] [?=Nestoridictyon KhromyKH, 2001, p. 348 (type, N. webbyi, OD)
Images
(Click to enlarge in a new window)
Synonyms
Geographic Distribution
Australia (Tasmania)
Age Range
Beginning Stage in Treatise Usage:
Middle-Upper Ordovician boundary
Beginning International Stage:
Darriwilian
Fraction Up In Beginning Stage:
50
Beginning Date:
463.8
Ending Stage in Treatise Usage:
upper part of the Chazy Group sequence, just above the Middle-Upper Ordovician boundary
Ending International Stage:
Sandbian
Fraction Up In Ending Stage:
50
Ending Date:
455.46
Description
Pillars large, continuous, with interiors preserved as sparry calcite infills (rarely solid); angular-oval to meandriform with lateral offsets to star-shaped (rarely regularly rounded) outlines in tangential section; in places, short, denticle-like flanges occur on outer walls of pillars; cyst plates large, of low convexity; in places, radially arranged pillars but not apparently incorporated into mamelon columns. [The genus includes a comparatively wide range of forms with rather different longitudinal structural elements, recognized presently as belonging to three species groups: (1) S. rugosum group (including type species), which is characterized by having pillars that in tangential section show vermicular to irregularly radiating outlines, rarely exhibit denticles, and apparently not associated with mamelon columns (Galloway & St. Jean, 1955); (2) S. bigsbyi group, based on S. bigsbyi WeBBy, 1979b, p. 248, characterized by pillars that in tangential section are oval to angular (rarely more complex), they lack denticles (were it not for the predominant sparry calcite pillar infills, such a form might be more appropriately assigned to Labechiella); and (3) S. michiganense group (including S. michiganense, S. platypilae Galloway in Galloway & St. Jean, 1961, and S. pergratum NeSTor, 1976; =S. moierense BogoyavlenSKaya, 1977a), which exhibits pillars with meandriform, platelike offsets that in places become partially closed polygonal meshworks.]
References
Museum or Author Information
Classification
Phylum:
Porifera
Class:
Stromatoporoidea
Order:
Labechiida
Superfamily:
Unknown
Family:
Stromatoceriidae
Formal Genus Name and Reference:
Stromatocerium bigsbyi (WEBBY, 1979b)
Type Species:
S. rugosum Hall, 1847, pl. 12,2; M] [?=Nestoridictyon KhromyKH, 2001, p. 348 (type, N. webbyi, OD)
Images
(Click to enlarge in a new window)Synonyms
Geographic Distribution
Australia (Tasmania)
Age Range
Beginning Stage in Treatise Usage:
Middle-Upper Ordovician boundary
Beginning International Stage:
Darriwilian
Fraction Up In Beginning Stage:
50
Beginning Date:
463.8
Ending Stage in Treatise Usage:
upper part of the Chazy Group sequence, just above the Middle-Upper Ordovician boundary
Ending International Stage:
Sandbian
Fraction Up In Ending Stage:
50
Ending Date:
455.46
Description
Pillars large, continuous, with interiors preserved as sparry calcite infills (rarely solid); angular-oval to meandriform with lateral offsets to star-shaped (rarely regularly rounded) outlines in tangential section; in places, short, denticle-like flanges occur on outer walls of pillars; cyst plates large, of low convexity; in places, radially arranged pillars but not apparently incorporated into mamelon columns. [The genus includes a comparatively wide range of forms with rather different longitudinal structural elements, recognized presently as belonging to three species groups: (1) S. rugosum group (including type species), which is characterized by having pillars that in tangential section show vermicular to irregularly radiating outlines, rarely exhibit denticles, and apparently not associated with mamelon columns (Galloway & St. Jean, 1955); (2) S. bigsbyi group, based on S. bigsbyi WeBBy, 1979b, p. 248, characterized by pillars that in tangential section are oval to angular (rarely more complex), they lack denticles (were it not for the predominant sparry calcite pillar infills, such a form might be more appropriately assigned to Labechiella); and (3) S. michiganense group (including S. michiganense, S. platypilae Galloway in Galloway & St. Jean, 1961, and S. pergratum NeSTor, 1976; =S. moierense BogoyavlenSKaya, 1977a), which exhibits pillars with meandriform, platelike offsets that in places become partially closed polygonal meshworks.]