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Lapworthella
Classification
Phylum:
Annelida
Class:
Polychaetia
Order:
Sedentarida
Family:
Sedentarida - Uncertain Family
Formal Genus Name and Reference:
Lapworthella COBBOLD, 1921 (p. 359)
Type Species:
*L. nigra
Images
(Click to enlarge in a new window)
Fig. 104,9. *L. nigra, Eng.; X10 (20)
Synonyms
Geographic Distribution
Eu.
Age Range
Beginning Stage in Treatise Usage:
L.Cam.
Beginning International Stage:
Fortunian
Fraction Up In Beginning Stage:
0
Beginning Date:
538.8
Ending Stage in Treatise Usage:
L.Cam.
Ending International Stage:
Cambrian Stage 4
Fraction Up In Ending Stage:
40
Ending Date:
512.3
Description
Tube tapering, circular or subpolygonal in cross section, consisting of 2 layers, outer chitinous and thinner than inner, which is calcareous; ornamented externally with pronounced concentric raised ridges (considered by FISHER to be related to Stenotheeopsis).
References
Museum or Author Information
Classification
Phylum:
Annelida
Class:
Polychaetia
Order:
Sedentarida
Family:
Sedentarida - Uncertain Family
Formal Genus Name and Reference:
Lapworthella COBBOLD, 1921 (p. 359)
Type Species:
*L. nigra
Images
(Click to enlarge in a new window)
Fig. 104,9. *L. nigra, Eng.; X10 (20)
Synonyms
Geographic Distribution
Eu.
Age Range
Beginning Stage in Treatise Usage:
L.Cam.
Beginning International Stage:
Fortunian
Fraction Up In Beginning Stage:
0
Beginning Date:
538.8
Ending Stage in Treatise Usage:
L.Cam.
Ending International Stage:
Cambrian Stage 4
Fraction Up In Ending Stage:
40
Ending Date:
512.3
Description
Tube tapering, circular or subpolygonal in cross section, consisting of 2 layers, outer chitinous and thinner than inner, which is calcareous; ornamented externally with pronounced concentric raised ridges (considered by FISHER to be related to Stenotheeopsis).