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Dimorphichnus
Classification
Phylum:
Trace Fossils and Problematica
Class:
Trace Fossils
Formal Genus Name and Reference:
Dimorphichnus SEILACHER, 1955, p. 346
Type Species:
D. obliquus; M]
Images
(Click to enlarge in a new window)
Fig. 38A,l. *D. obliquus, Jutana Dol., Pak.; 1a, X0.16; 1b, X0.8; 1c, X0.4 (Seilacher, 1955).
Synonyms
Geographic Distribution
Cam., Eu.(Swed.-Eng.-Pol.)-Asia(Pak.); Ord., S.Am.(AIg.)
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:
Ord.
Ending International Stage:
Hirnantian
Fraction Up In Ending Stage:
100
Ending Date:
443.07
Description
Asymmetrical tIails with 2 different types of impressions; thin sigmoidal ones, produced by raking movement ("Hark-Siegel" of SEILACHER), and blunt ones, similar to impressions of toes ("support imprints," "StemmSiegel" of SEILACHER); both types arranged in series oblique to direction of movement. [Made by laterally grazing trilobites; for discussion of the paleoecologic significance see OSGOOD (1970, p. 353.]
References
Museum or Author Information
Classification
Phylum:
Trace Fossils and Problematica
Class:
Trace Fossils
Formal Genus Name and Reference:
Dimorphichnus SEILACHER, 1955, p. 346
Type Species:
D. obliquus; M]
Images
(Click to enlarge in a new window)
Fig. 38A,l. *D. obliquus, Jutana Dol., Pak.; 1a, X0.16; 1b, X0.8; 1c, X0.4 (Seilacher, 1955).
Synonyms
Geographic Distribution
Cam., Eu.(Swed.-Eng.-Pol.)-Asia(Pak.); Ord., S.Am.(AIg.)
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:
Ord.
Ending International Stage:
Hirnantian
Fraction Up In Ending Stage:
100
Ending Date:
443.07
Description
Asymmetrical tIails with 2 different types of impressions; thin sigmoidal ones, produced by raking movement ("Hark-Siegel" of SEILACHER), and blunt ones, similar to impressions of toes ("support imprints," "StemmSiegel" of SEILACHER); both types arranged in series oblique to direction of movement. [Made by laterally grazing trilobites; for discussion of the paleoecologic significance see OSGOOD (1970, p. 353.]