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Actinostroma
Classification
Phylum:
Cnidaria
Class:
Hydrozoa
Order:
Stromatoporoidea
Family:
Actinostromatidae
Formal Genus Name and Reference:
Actinostroma NICHOLSON, 1886
Type Species:
A. clathratum
Images
(Click to enlarge in a new window)
Figs. 92,2; 93,1; 103,2. A. devonense LECOMPTE, U.Dev. (L.Frasn.), Belg.; long., tang., long. secs., X3 (49). -- Figs. 86,3; 91,1. *A. clatllratum, M.Dev., Eng.; 86,3, exterior of base, XO.5; 91,1, long. sec., X12 (50·,50). -- Fig. 103,1. A. astroites ROSEN, M.Sil. (Wenlock.), Eng.; long. sec., X10 (50·). -- Fig. 94,1. A. intertextum NlcH., M.Sil., Eng.; long. sec., X10 (52).
Synonyms
Actinostromella, Gerronostroma
Geographic Distribution
cosmop.
Age Range
Beginning Stage in Treatise Usage:
Cam.
Beginning International Stage:
Fortunian
Fraction Up In Beginning Stage:
0
Beginning Date:
538.8
Ending Stage in Treatise Usage:
L.Carb.
Ending International Stage:
Serpukhovian
Fraction Up In Ending Stage:
100
Ending Date:
323.4
Description
Skeletal elements essentially perpendicular to one another, lamellar network commonly formed by complex meshes connected at regular or variable levels to pillars. Skeletal fibers compact (20). (This genus generally has been distinguished from Actinostromaria by its lack of superposed astrorhizae, but this character is not reliable, since they do occur in some species of Actinostroma. Mesozoic species assigned to Actinostroma actually belong to Actinostromaria, as shown by their fibrous skeletal structure.)
References
Nicholson, H. A., 1886-92, A monograph of the British stromatoporoids: Palaeontograph. Soc. Mon. (London), $234 \mathrm{p} ., 29 \mathrm{pl}$.
Museum or Author Information
Classification
Phylum:
Cnidaria
Class:
Hydrozoa
Order:
Stromatoporoidea
Family:
Actinostromatidae
Formal Genus Name and Reference:
Actinostroma NICHOLSON, 1886
Type Species:
A. clathratum
Images
(Click to enlarge in a new window)
Figs. 92,2; 93,1; 103,2. A. devonense LECOMPTE, U.Dev. (L.Frasn.), Belg.; long., tang., long. secs., X3 (49). -- Figs. 86,3; 91,1. *A. clatllratum, M.Dev., Eng.; 86,3, exterior of base, XO.5; 91,1, long. sec., X12 (50·,50). -- Fig. 103,1. A. astroites ROSEN, M.Sil. (Wenlock.), Eng.; long. sec., X10 (50·). -- Fig. 94,1. A. intertextum NlcH., M.Sil., Eng.; long. sec., X10 (52).
Synonyms
Actinostromella, Gerronostroma
Geographic Distribution
cosmop.
Age Range
Beginning Stage in Treatise Usage:
Cam.
Beginning International Stage:
Fortunian
Fraction Up In Beginning Stage:
0
Beginning Date:
538.8
Ending Stage in Treatise Usage:
L.Carb.
Ending International Stage:
Serpukhovian
Fraction Up In Ending Stage:
100
Ending Date:
323.4
Description
Skeletal elements essentially perpendicular to one another, lamellar network commonly formed by complex meshes connected at regular or variable levels to pillars. Skeletal fibers compact (20). (This genus generally has been distinguished from Actinostromaria by its lack of superposed astrorhizae, but this character is not reliable, since they do occur in some species of Actinostroma. Mesozoic species assigned to Actinostroma actually belong to Actinostromaria, as shown by their fibrous skeletal structure.)
References
Nicholson, H. A., 1886-92, A monograph of the British stromatoporoids: Palaeontograph. Soc. Mon. (London), $234 \mathrm{p} ., 29 \mathrm{pl}$.