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Nannoconus
Classification
Phylum:
Trace Fossils and Problematica
Class:
Microproblematica
Formal Genus Name and Reference:
Nannoconus KAMPTNER, 1931, p. 288
Type Species:
*N. steinmanni, OD
Images
(Click to enlarge in a new window)
Fig. 98,4a,b. *N. colomi (DE LAPPARENT), L.Cret., Cuba; 4a,b, long., transv. secs., ca. X 1,575 (Bronnimann, 1955). -- Fig. 98, 4c. N. steinmanni KAMPTNER, L.Cret., Cuba; (slightly retouched), ca. X1 ,575 (Bronnimann, 1955).
Synonyms
Geographic Distribution
Eu.-N.Afr.-C.Am. (W.Indies (Cuba) - ?Mexico).
Age Range
Beginning Stage in Treatise Usage:
U.Jur.
Beginning International Stage:
Oxfordian
Fraction Up In Beginning Stage:
0
Beginning Date:
161.53
Ending Stage in Treatise Usage:
U.Cret.
Ending International Stage:
Maastrichtian
Fraction Up In Ending Stage:
100
Ending Date:
66.04
Description
Microscopically small peg-shaped microorganisms with axial canal or large central cavity, 5 to >50 microns (commonly 15 to 20 μ) long, 5 to 10 microns wide; outline conical, spherical, pear-shaped, barrel-shaped, cylindrical, or U-shaped; composed of numerous wedge-shaped individual elements; wedges arranged in mounting spiral or spirals, oblique to axis, 2 terminal apertures. [Systematic position "still obscure" (BRONNIMANN, 1955); ?skeletal remains of planktonic Protozoa; regarded as embryonic stage of Lagena or Lagena proper (DE LAPPARENT, 1931), as alga (CADISCH, fide COLOM, 1945) and as belonging to Fibrosphaera DE LAPPARENT (COLOM, 1945); ?relationship to oogonia of algae (BRONNIMANN, 1955); see also CAMPBELL, 1954, p. DI70-DI71.]
References
Museum or Author Information
Classification
Phylum:
Trace Fossils and Problematica
Class:
Microproblematica
Formal Genus Name and Reference:
Nannoconus KAMPTNER, 1931, p. 288
Type Species:
*N. steinmanni, OD
Images
(Click to enlarge in a new window)
Fig. 98,4a,b. *N. colomi (DE LAPPARENT), L.Cret., Cuba; 4a,b, long., transv. secs., ca. X 1,575 (Bronnimann, 1955). -- Fig. 98, 4c. N. steinmanni KAMPTNER, L.Cret., Cuba; (slightly retouched), ca. X1 ,575 (Bronnimann, 1955).
Synonyms
Geographic Distribution
Eu.-N.Afr.-C.Am. (W.Indies (Cuba) - ?Mexico).
Age Range
Beginning Stage in Treatise Usage:
U.Jur.
Beginning International Stage:
Oxfordian
Fraction Up In Beginning Stage:
0
Beginning Date:
161.53
Ending Stage in Treatise Usage:
U.Cret.
Ending International Stage:
Maastrichtian
Fraction Up In Ending Stage:
100
Ending Date:
66.04
Description
Microscopically small peg-shaped microorganisms with axial canal or large central cavity, 5 to >50 microns (commonly 15 to 20 μ) long, 5 to 10 microns wide; outline conical, spherical, pear-shaped, barrel-shaped, cylindrical, or U-shaped; composed of numerous wedge-shaped individual elements; wedges arranged in mounting spiral or spirals, oblique to axis, 2 terminal apertures. [Systematic position "still obscure" (BRONNIMANN, 1955); ?skeletal remains of planktonic Protozoa; regarded as embryonic stage of Lagena or Lagena proper (DE LAPPARENT, 1931), as alga (CADISCH, fide COLOM, 1945) and as belonging to Fibrosphaera DE LAPPARENT (COLOM, 1945); ?relationship to oogonia of algae (BRONNIMANN, 1955); see also CAMPBELL, 1954, p. DI70-DI71.]