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Idiostroma
Classification
Phylum:
Porifera
Class:
Stromatoporoidea
Order:
Stromatoporellida
Family:
Idiostromatidae
Formal Genus Name and Reference:
Idiostroma WINCHELL, 1867, p. 99
Type Species:
Stromatopora caespitosa Winchell, 1866, p. 91, OD, lectotype, UMMP 32401A (slides W2-17, 18), Galloway & EHLERS, 1960, p. 63
Images
(Click to enlarge in a new window)
Fig. 449a-c. *I. caespitosum (Winchell), lectotype, UMMP 32401A, Petoskey Formation, Little Traverse Bay, Michigan, a, axial section showing central canal, X10, b, cross section of skeleton showing axial canal and vacuolate pachysteles, X10, c, cross section of laminae showing vacuolate microstructure, X25 (Stearn, 2011b).
Synonyms
Geographic Distribution
Germany (Sauerland), Eifelian, Australia (Queensland), China (Guizhou, Guangxi, Hunan, southern Tien Shan, Xizang), Mongolia, Spain (Cantabria), USA (Iowa, Michigan), Vietnam, Givetian, Uzbekistan, China (Sichuan), Germany, Russia (Urals), Middle Devonian, Australia (Canning Basin), Canada (northern Alberta), Uzbekistan, China (Sichuan), Czech Republic (Moravia), western Germany, Frasnian
Age Range
Beginning Stage in Treatise Usage:
Middle Devonian (Eifelian)
Beginning International Stage:
Eifelian
Fraction Up In Beginning Stage:
0
Beginning Date:
394.3
Ending Stage in Treatise Usage:
Upper Devonian (Frasnian)
Ending International Stage:
Frasnian
Fraction Up In Ending Stage:
100
Ending Date:
371.1
Description
Growth form dendroid with axial tabulated canal and, in some species, subsidiary canals. Axial zone of amalgamate structure in transverse section, passing outward into peripheral zone of well-defined continuous or superposed pachysteles, intervening allotubes crossed by dissepiments and concentric laminae. Laminae variably expressed by alignment of opaque dissepiments to form microlaminae, by well-defined opaque microlaminae passing through pachysteles, and/or by tripartite laminae with central light zone. Laminae forming parabolas parallel to successive growth surfaces in longitudinal section. Microstructure coarsely and irregularly vacuolate. [Vacuolate microstructure, tripartite laminae, and the tendency for the dominance of concentric laminae over pachysteles are distinguishing features of the lectotype, but parts of it resemble Stachyodes in microstructure. Nicholson’s (1886a) description of the genus, which was widely accepted by later workers, was based on I. roemeri Nicholson, in the absence at that time of adequate descriptions of the type species.]
References
Winchell, A. N. 1867. Stromatoporidae: Their structure and zoological affinities. Proceedings of the American Association for the Advancement of Science 15:91-99.
Museum or Author Information
Classification
Phylum:
Porifera
Class:
Stromatoporoidea
Order:
Stromatoporellida
Family:
Idiostromatidae
Formal Genus Name and Reference:
Idiostroma WINCHELL, 1867, p. 99
Type Species:
Stromatopora caespitosa Winchell, 1866, p. 91, OD, lectotype, UMMP 32401A (slides W2-17, 18), Galloway & EHLERS, 1960, p. 63
Images
(Click to enlarge in a new window)
Fig. 449a-c. *I. caespitosum (Winchell), lectotype, UMMP 32401A, Petoskey Formation, Little Traverse Bay, Michigan, a, axial section showing central canal, X10, b, cross section of skeleton showing axial canal and vacuolate pachysteles, X10, c, cross section of laminae showing vacuolate microstructure, X25 (Stearn, 2011b).
Synonyms
Geographic Distribution
Germany (Sauerland), Eifelian, Australia (Queensland), China (Guizhou, Guangxi, Hunan, southern Tien Shan, Xizang), Mongolia, Spain (Cantabria), USA (Iowa, Michigan), Vietnam, Givetian, Uzbekistan, China (Sichuan), Germany, Russia (Urals), Middle Devonian, Australia (Canning Basin), Canada (northern Alberta), Uzbekistan, China (Sichuan), Czech Republic (Moravia), western Germany, Frasnian
Age Range
Beginning Stage in Treatise Usage:
Middle Devonian (Eifelian)
Beginning International Stage:
Eifelian
Fraction Up In Beginning Stage:
0
Beginning Date:
394.3
Ending Stage in Treatise Usage:
Upper Devonian (Frasnian)
Ending International Stage:
Frasnian
Fraction Up In Ending Stage:
100
Ending Date:
371.1
Description
Growth form dendroid with axial tabulated canal and, in some species, subsidiary canals. Axial zone of amalgamate structure in transverse section, passing outward into peripheral zone of well-defined continuous or superposed pachysteles, intervening allotubes crossed by dissepiments and concentric laminae. Laminae variably expressed by alignment of opaque dissepiments to form microlaminae, by well-defined opaque microlaminae passing through pachysteles, and/or by tripartite laminae with central light zone. Laminae forming parabolas parallel to successive growth surfaces in longitudinal section. Microstructure coarsely and irregularly vacuolate. [Vacuolate microstructure, tripartite laminae, and the tendency for the dominance of concentric laminae over pachysteles are distinguishing features of the lectotype, but parts of it resemble Stachyodes in microstructure. Nicholson’s (1886a) description of the genus, which was widely accepted by later workers, was based on I. roemeri Nicholson, in the absence at that time of adequate descriptions of the type species.]
References
Winchell, A. N. 1867. Stromatoporidae: Their structure and zoological affinities. Proceedings of the American Association for the Advancement of Science 15:91-99.