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Pragnellia
Classification
Phylum:
Cnidaria
Class:
Anthozoa
Subclass:
Tabulata
Order:
Heliolitida
Suborder:
Heliolitina
Superfamily:
Coccoseridicae
Family:
Coccoseridicae - Family uncertain
Formal Genus Name and Reference:
Pragnellia LEITH, 1952, p. 794
Type Species:
P. arborescens; M; +429P, Manitoba Museum, Winnipeg. [For discussion of systematic position see BONDARENKO, 1969, p. 105. LIN in LIN & CHOW, 1977, p. 193, included Pragnellia together with a new family Sibiriolitidae LIN in a new order of Tabulata, Pragnellida LIN.]
Images
(Click to enlarge in a new window)
Fig. 427,la-c. ·P. arborescens, holotype, Manit., Stony Mountain; a, transv. sec. internode, X3.8, b,c, ext. views, X4.7, X0.3 (Leith, 1952).
Synonyms
Geographic Distribution
N. Am. (Manit.-?Texas)-Eu.(W. slope of Urals-?Ire.)
Age Range
Beginning Stage in Treatise Usage:
U. Ord.(Richmond.)
Beginning International Stage:
Katian
Fraction Up In Beginning Stage:
66.7
Beginning Date:
447.72
Ending Stage in Treatise Usage:
U.Ord.(Richmond.)
Ending International Stage:
Katian
Fraction Up In Ending Stage:
100
Ending Date:
445.21
Description
Polyparium branching by dichotomy, branches of internodes of calcareous skeletal elements and nodes that were not calcareous, possibly proteinous, internodes phalangoid, with 'corallites' lacking distinct walls surrounded by common tissue of loosely packed, prickly rods perpendicular to surface; neither septa nor tabulae noted, but barlike connections are found between rods of common tissue; 'corallites' almost completely filled with sclerenchyme. [Alternation within the branches of calcareous internodes with ?horny nodes recalls that in members of octocorallian Isididae also (see BAYER, 1956b, p. F222), the microstructure of the calcareous parts of the branches is very similar to that of octocorallian Helioporidae. Perhaps Pragnellia is an alcyonarian.]
References
Leith, E. I., 1952, Schizocoralla from the Ordovician of Manitoba: J. Paleontol., v. 26, p. $789-$ 796, pl. 114-116.
Museum or Author Information
Classification
Phylum:
Cnidaria
Class:
Anthozoa
Subclass:
Tabulata
Order:
Heliolitida
Suborder:
Heliolitina
Superfamily:
Coccoseridicae
Family:
Coccoseridicae - Family uncertain
Formal Genus Name and Reference:
Pragnellia LEITH, 1952, p. 794
Type Species:
P. arborescens; M; +429P, Manitoba Museum, Winnipeg. [For discussion of systematic position see BONDARENKO, 1969, p. 105. LIN in LIN & CHOW, 1977, p. 193, included Pragnellia together with a new family Sibiriolitidae LIN in a new order of Tabulata, Pragnellida LIN.]
Images
(Click to enlarge in a new window)
Fig. 427,la-c. ·P. arborescens, holotype, Manit., Stony Mountain; a, transv. sec. internode, X3.8, b,c, ext. views, X4.7, X0.3 (Leith, 1952).
Synonyms
Geographic Distribution
N. Am. (Manit.-?Texas)-Eu.(W. slope of Urals-?Ire.)
Age Range
Beginning Stage in Treatise Usage:
U. Ord.(Richmond.)
Beginning International Stage:
Katian
Fraction Up In Beginning Stage:
66.7
Beginning Date:
447.72
Ending Stage in Treatise Usage:
U.Ord.(Richmond.)
Ending International Stage:
Katian
Fraction Up In Ending Stage:
100
Ending Date:
445.21
Description
Polyparium branching by dichotomy, branches of internodes of calcareous skeletal elements and nodes that were not calcareous, possibly proteinous, internodes phalangoid, with 'corallites' lacking distinct walls surrounded by common tissue of loosely packed, prickly rods perpendicular to surface; neither septa nor tabulae noted, but barlike connections are found between rods of common tissue; 'corallites' almost completely filled with sclerenchyme. [Alternation within the branches of calcareous internodes with ?horny nodes recalls that in members of octocorallian Isididae also (see BAYER, 1956b, p. F222), the microstructure of the calcareous parts of the branches is very similar to that of octocorallian Helioporidae. Perhaps Pragnellia is an alcyonarian.]
References
Leith, E. I., 1952, Schizocoralla from the Ordovician of Manitoba: J. Paleontol., v. 26, p. $789-$ 796, pl. 114-116.