Welcome to the Treatise on Invertebrate Paleontology!
Please enter a genera name to retrieve more information.
Heterohelix
Classification
Phylum:
Protista
Subphylum:
Sarcodina
Class:
Reticularea
Subclass:
Granuloreticulosia
Order:
Foraminiferida
Suborder:
Rotalina
Superfamily:
Globigerinacea
Family:
Heterohelicidae
Subfamily:
Heterohelicinae
Formal Genus Name and Reference:
Heterohelix EHRENBERG, 1843, *672, p. 429
Type Species:
Spiroplecta americana Ehrenberg, 1844, *673, p. 75, SD (SM) EHRENBERG, 1844, *673, p. 75
Images
(Click to enlarge in a new window)
Fig. 523,5. *H. americana (EHRENBERG), U.Cret.(L.Maastrcht.), USA(Tex.); 5a,b, side, edge views (holotype of H. navarroensis), X146 (*1150). -- Fig. 523,6,7. H. globulosa (EHRENBERG), U. Cret. (Maastricht.), USA (Tex.) ; 6,7, megalospheric and
microspheric tests, X 105 (*1150)
Synonyms
Spiroplecta
Geographic Distribution
cosmop.
Age Range
Beginning Stage in Treatise Usage:
L.Cret.(Apt.)
Beginning International Stage:
Aptian
Fraction Up In Beginning Stage:
0
Beginning Date:
121.4
Ending Stage in Treatise Usage:
U. Cret.(Maastricht.}
Ending International Stage:
Maastrichtian
Fraction Up In Ending Stage:
100
Ending Date:
66.04
Description
Test small, consisting of subglobular biserially arranged chambers, early portion of microspheric test commonly planispiral; surface smooth or striate; aperture large, interiomarginal, symmetrical.
References
Museum or Author Information
Classification
Phylum:
Protista
Subphylum:
Sarcodina
Class:
Reticularea
Subclass:
Granuloreticulosia
Order:
Foraminiferida
Suborder:
Rotalina
Superfamily:
Globigerinacea
Family:
Heterohelicidae
Subfamily:
Heterohelicinae
Formal Genus Name and Reference:
Heterohelix EHRENBERG, 1843, *672, p. 429
Type Species:
Spiroplecta americana Ehrenberg, 1844, *673, p. 75, SD (SM) EHRENBERG, 1844, *673, p. 75
Images
(Click to enlarge in a new window)
Fig. 523,5. *H. americana (EHRENBERG), U.Cret.(L.Maastrcht.), USA(Tex.); 5a,b, side, edge views (holotype of H. navarroensis), X146 (*1150). -- Fig. 523,6,7. H. globulosa (EHRENBERG), U. Cret. (Maastricht.), USA (Tex.) ; 6,7, megalospheric and
microspheric tests, X 105 (*1150)
Synonyms
Spiroplecta
Geographic Distribution
cosmop.
Age Range
Beginning Stage in Treatise Usage:
L.Cret.(Apt.)
Beginning International Stage:
Aptian
Fraction Up In Beginning Stage:
0
Beginning Date:
121.4
Ending Stage in Treatise Usage:
U. Cret.(Maastricht.}
Ending International Stage:
Maastrichtian
Fraction Up In Ending Stage:
100
Ending Date:
66.04
Description
Test small, consisting of subglobular biserially arranged chambers, early portion of microspheric test commonly planispiral; surface smooth or striate; aperture large, interiomarginal, symmetrical.