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Platythalamiella
Classification
Phylum:
Porifera
Class:
Demospongea
Order:
Vaceletida
Superfamily:
Pileolitoidea
Family:
Colospongiidae
Formal Genus Name and Reference:
Platythalamiella Senowbari-Daryan & RIGBY, 1988, p. 184
Type Species:
P. newelli, OD
Images
(Click to enlarge in a new window)
Fig. 468, 1a–b. *P. newelli, Djebel Tebaga Biohermal Complex, Changhsingian, Djebel Tebaga, Tunisia; a, holotype, polished horizontal section showing chamber form, thick, perforate walls, and stacking, USNM 427300, X2; b, vertical section through blade of paratype with irregularly overlapping, crescentic, chamber walls, USNM 427301, X1 (Senowbari-Daryan & Rigby, 1988).
Synonyms
Guadalupia
Geographic Distribution
Tunisia, Timor, Italy, Moluccas, Lopingian, ?Sicily, Norian-Rhaetian
Age Range
Beginning Stage in Treatise Usage:
Permian (Lopingian)
Beginning International Stage:
Wuchiapingian
Fraction Up In Beginning Stage:
0
Beginning Date:
259.55
Ending Stage in Treatise Usage:
Upper Triassic (Rhaetian)
Ending International Stage:
Rhaetian
Fraction Up In Ending Stage:
100
Ending Date:
201.36
Description
[The incompletely preserved specimens on which this genus was based agree almost entirely with the type species of Guadalupia Girty, 1909 (G. zitteliana Girty), except for the absence of a trabecularium, and of diaphragms within the chambers. It is possible that a trabecularium was present but not preserved or recognized. A possible diaphragm is visible in the illustration of the paratype (Senowbari-Daryan & Rigby, 1988, pl. 29, 8, near upper left) and these latter structures are often rare or absent in Guadalupia specimens.]
References
Rigby, J. K., A. W. Potter, \& R. B. Blodgett. 1988. Ordovician sphinctozoan sponges of Alaska and Yukon Territory. Journal of Paleontology 62:731746, 5 fig.
Museum or Author Information
Classification
Phylum:
Porifera
Class:
Demospongea
Order:
Vaceletida
Superfamily:
Pileolitoidea
Family:
Colospongiidae
Formal Genus Name and Reference:
Platythalamiella Senowbari-Daryan & RIGBY, 1988, p. 184
Type Species:
P. newelli, OD
Images
(Click to enlarge in a new window)
Fig. 468, 1a–b. *P. newelli, Djebel Tebaga Biohermal Complex, Changhsingian, Djebel Tebaga, Tunisia; a, holotype, polished horizontal section showing chamber form, thick, perforate walls, and stacking, USNM 427300, X2; b, vertical section through blade of paratype with irregularly overlapping, crescentic, chamber walls, USNM 427301, X1 (Senowbari-Daryan & Rigby, 1988).
Synonyms
Guadalupia
Geographic Distribution
Tunisia, Timor, Italy, Moluccas, Lopingian, ?Sicily, Norian-Rhaetian
Age Range
Beginning Stage in Treatise Usage:
Permian (Lopingian)
Beginning International Stage:
Wuchiapingian
Fraction Up In Beginning Stage:
0
Beginning Date:
259.55
Ending Stage in Treatise Usage:
Upper Triassic (Rhaetian)
Ending International Stage:
Rhaetian
Fraction Up In Ending Stage:
100
Ending Date:
201.36
Description
[The incompletely preserved specimens on which this genus was based agree almost entirely with the type species of Guadalupia Girty, 1909 (G. zitteliana Girty), except for the absence of a trabecularium, and of diaphragms within the chambers. It is possible that a trabecularium was present but not preserved or recognized. A possible diaphragm is visible in the illustration of the paratype (Senowbari-Daryan & Rigby, 1988, pl. 29, 8, near upper left) and these latter structures are often rare or absent in Guadalupia specimens.]
References
Rigby, J. K., A. W. Potter, \& R. B. Blodgett. 1988. Ordovician sphinctozoan sponges of Alaska and Yukon Territory. Journal of Paleontology 62:731746, 5 fig.