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Archaecyclus
Classification
Phylum:
Protista
Subphylum:
Sarcodina
Class:
Reticularea
Subclass:
Granuloreticulosia
Order:
Foraminiferida
Suborder:
Rotalina
Superfamily:
Orbitoidacea
Family:
Cymbaloporidae
Formal Genus Name and Reference:
Archaecyclus A. Silvestri, 1908, *1771, p. 134
Type Species:
Planorbulina cenomaniana Seguenza, 1882, *1714, p. 200, OD (M)
Images
(Click to enlarge in a new window)
Fig. 572,1,2. *A. cenomaniana (Seguenza); 1a, ext., X35; 1b, portion of surface, X 100; 1c, same in balsam to show internal structure, X 100; 2, part of test with upper surface removed by HCI treatment, mounted in balsam, XIOO ("1714)
Synonyms
Geographic Distribution
Eu.(Italy)
Age Range
Beginning Stage in Treatise Usage:
U.Cret.(Cenoman.)
Beginning International Stage:
Cenomanian
Fraction Up In Beginning Stage:
0
Beginning Date:
100.5
Ending Stage in Treatise Usage:
U.Cret.(Cenoman.)
Ending International Stage:
Cenomanian
Fraction Up In Ending Stage:
100
Ending Date:
93.9
Description
Test large, discoidal, flat to concavo-convex, to 1.6 mm . diam., proloculus large, followed by coiled early portion of about 5 chambers to whorl, later in annular series with chambers of successive series alternating in position, sutures oblique, wall calcareous, perforate, bilamellar, with thin, dark, median layer, aperture in early stage interiomarginal, later with stolon-like pores at sides of each chamber
References
Museum or Author Information
Classification
Phylum:
Protista
Subphylum:
Sarcodina
Class:
Reticularea
Subclass:
Granuloreticulosia
Order:
Foraminiferida
Suborder:
Rotalina
Superfamily:
Orbitoidacea
Family:
Cymbaloporidae
Formal Genus Name and Reference:
Archaecyclus A. Silvestri, 1908, *1771, p. 134
Type Species:
Planorbulina cenomaniana Seguenza, 1882, *1714, p. 200, OD (M)
Images
(Click to enlarge in a new window)
Fig. 572,1,2. *A. cenomaniana (Seguenza); 1a, ext., X35; 1b, portion of surface, X 100; 1c, same in balsam to show internal structure, X 100; 2, part of test with upper surface removed by HCI treatment, mounted in balsam, XIOO ("1714)
Synonyms
Geographic Distribution
Eu.(Italy)
Age Range
Beginning Stage in Treatise Usage:
U.Cret.(Cenoman.)
Beginning International Stage:
Cenomanian
Fraction Up In Beginning Stage:
0
Beginning Date:
100.5
Ending Stage in Treatise Usage:
U.Cret.(Cenoman.)
Ending International Stage:
Cenomanian
Fraction Up In Ending Stage:
100
Ending Date:
93.9
Description
Test large, discoidal, flat to concavo-convex, to 1.6 mm . diam., proloculus large, followed by coiled early portion of about 5 chambers to whorl, later in annular series with chambers of successive series alternating in position, sutures oblique, wall calcareous, perforate, bilamellar, with thin, dark, median layer, aperture in early stage interiomarginal, later with stolon-like pores at sides of each chamber