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Rangea
Classification
Phylum:
Ctenophora ("comb-jellies")
Class:
None
Formal Genus Name and Reference:
Rangea GÜRICH, 1930
Type Species:
*R. schneiderhohni
Images
(Click to enlarge in a new window)
Fig. 358. Morphology of Ctenophora illustrated by Pleurobrachia rhododactyla, Rec., Atl., X1 (AGASSIZ).
Synonyms
Geographic Distribution
S.Afr. (Otavi 1m., Kuibis quartzite)
Age Range
Beginning Stage in Treatise Usage:
L.Paleoz.
Beginning International Stage:
Fortunian
Fraction Up In Beginning Stage:
0
Beginning Date:
538.8
Ending Stage in Treatise Usage:
L.Paleoz.
Ending International Stage:
Famennian
Fraction Up In Ending Stage:
100
Ending Date:
359.3
Description
Said to resemble Beroë. Subphylum = Ctenophores ("comb-jellies") are transparent, pelagic, mobile, marine, coelenterated animals, mostly globular in shape (Fig. 358). They are characterized by body layers of endoderm, mesogloea, and ectoderm, possession of biradial symmetry, a gastrovascular cavity and stomodaeum, and position of the gonads. From the Cnidaria they are differentiated by the presence of colloblasts (lasso cells) instead of nematocysts, by locomotion almost wholly by means of ciliary movement cencentrated in 8 longitudinal bands, enormous thickening of the mesogloea, presence of a statocyst or sensitive organ at the aboral end, and solid tentacles with axial mesogloea. Rec. [No fossil ctenophores are known certainly, their preservation being most improbable, although 2 genera have been suggested as belonging here:]
References
Museum or Author Information
Classification
Phylum:
Ctenophora ("comb-jellies")
Class:
None
Formal Genus Name and Reference:
Rangea GÜRICH, 1930
Type Species:
*R. schneiderhohni
Images
(Click to enlarge in a new window)
Fig. 358. Morphology of Ctenophora illustrated by Pleurobrachia rhododactyla, Rec., Atl., X1 (AGASSIZ).
Synonyms
Geographic Distribution
S.Afr. (Otavi 1m., Kuibis quartzite)
Age Range
Beginning Stage in Treatise Usage:
L.Paleoz.
Beginning International Stage:
Fortunian
Fraction Up In Beginning Stage:
0
Beginning Date:
538.8
Ending Stage in Treatise Usage:
L.Paleoz.
Ending International Stage:
Famennian
Fraction Up In Ending Stage:
100
Ending Date:
359.3
Description
Said to resemble Beroë. Subphylum = Ctenophores ("comb-jellies") are transparent, pelagic, mobile, marine, coelenterated animals, mostly globular in shape (Fig. 358). They are characterized by body layers of endoderm, mesogloea, and ectoderm, possession of biradial symmetry, a gastrovascular cavity and stomodaeum, and position of the gonads. From the Cnidaria they are differentiated by the presence of colloblasts (lasso cells) instead of nematocysts, by locomotion almost wholly by means of ciliary movement cencentrated in 8 longitudinal bands, enormous thickening of the mesogloea, presence of a statocyst or sensitive organ at the aboral end, and solid tentacles with axial mesogloea. Rec. [No fossil ctenophores are known certainly, their preservation being most improbable, although 2 genera have been suggested as belonging here:]