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Acrothele
Classification
Phylum:
Brachiopoda
Class:
Lingulata
Order:
Lingulida
Superfamily:
Acrotheloidea
Family:
Acrothelidae
Formal Genus Name and Reference:
Acrothele Linnarsson, 1876, p. 20
Type Species:
A. coriacea, SD OEHLERT, 1887b, p. 1270
Images
(Click to enlarge in a new window)
Fig. 45, $1 a-l$. $* A$. coriacea, Middle Cambrian, a, ventral valve exterior, Bornholm, Denmark, USNM 51983a, X6.3, b, ventral valve interior, USNM 18208a, X6.3, c, dorsal valve interior, Scania (Andrarum), Sweden, USNM 18208d, X6.3, $d$, dorsal valve exterior, $X_{11}$, $e$, lateral view of dorsal valve, $X_{18}, f$, lateral view of dorsal larval shell, $X_{62}$, $g$, detail of dorsal larval spine and pitting, SGU 8498, x229$, $h$, detail of dorsal pseudointerarea, SGU 8499, x17.5, ~ i$, ventral valve exterior, x19.2$, $j$, detail of ventral larval shell, x6 2 . 5, } k$, posterior view of ventral valve, SGU 8500, $\\mathbf{X} 42$, $l$, ventral valve interior, Östergötland (Knivinge), Sweden, SGU 8501, X33.3 (new).——Fig. 45, $1 m-$ o. $A$. granulata (Linnarsson), Middle Cambrian, Paradoxides oelandicus Biozone, Öland (Borgholm), Sweden, $m$, dorsal valve exterior, USNM 511991c, X3.3, $n$, ventral valve exterior, USNM 511991a, X3.3, $o$, dorsal valve interior, USNM 511991d, X3.3 (new).
Synonyms
Dearbornia, Redlichella, Acrotreta, Glyptacrothele
Geographic Distribution
cosmopolitan (exact stratigraphic and geographic range is very uncertain)
Age Range
Beginning Stage in Treatise Usage:
Lower Cambrian, Middle Cambrian, Upper Cambrian
Beginning International Stage:
Fortunian
Fraction Up In Beginning Stage:
0
Beginning Date:
538.8
Ending Stage in Treatise Usage:
Lower Cambrian, Middle Cambrian, Upper Cambrian
Ending International Stage:
Cambrian Stage 10
Fraction Up In Ending Stage:
100
Ending Date:
486.85
Description
Ornament of fine, concentric growth lines, usually with additional irregular wavy ridges bearing minute granules, dorsal pseudointerarea forming obtusely triangular plate not raised above valve floor, internal pedicle tube absent, ventral larval shell with median tubercle
References
Museum or Author Information
Classification
Phylum:
Brachiopoda
Class:
Lingulata
Order:
Lingulida
Superfamily:
Acrotheloidea
Family:
Acrothelidae
Formal Genus Name and Reference:
Acrothele Linnarsson, 1876, p. 20
Type Species:
A. coriacea, SD OEHLERT, 1887b, p. 1270
Images
(Click to enlarge in a new window)
Fig. 45, $1 a-l$. $* A$. coriacea, Middle Cambrian, a, ventral valve exterior, Bornholm, Denmark, USNM 51983a, X6.3, b, ventral valve interior, USNM 18208a, X6.3, c, dorsal valve interior, Scania (Andrarum), Sweden, USNM 18208d, X6.3, $d$, dorsal valve exterior, $X_{11}$, $e$, lateral view of dorsal valve, $X_{18}, f$, lateral view of dorsal larval shell, $X_{62}$, $g$, detail of dorsal larval spine and pitting, SGU 8498, x229$, $h$, detail of dorsal pseudointerarea, SGU 8499, x17.5, ~ i$, ventral valve exterior, x19.2$, $j$, detail of ventral larval shell, x6 2 . 5, } k$, posterior view of ventral valve, SGU 8500, $\\mathbf{X} 42$, $l$, ventral valve interior, Östergötland (Knivinge), Sweden, SGU 8501, X33.3 (new).——Fig. 45, $1 m-$ o. $A$. granulata (Linnarsson), Middle Cambrian, Paradoxides oelandicus Biozone, Öland (Borgholm), Sweden, $m$, dorsal valve exterior, USNM 511991c, X3.3, $n$, ventral valve exterior, USNM 511991a, X3.3, $o$, dorsal valve interior, USNM 511991d, X3.3 (new).
Synonyms
Dearbornia, Redlichella, Acrotreta, Glyptacrothele
Geographic Distribution
cosmopolitan (exact stratigraphic and geographic range is very uncertain)
Age Range
Beginning Stage in Treatise Usage:
Lower Cambrian, Middle Cambrian, Upper Cambrian
Beginning International Stage:
Fortunian
Fraction Up In Beginning Stage:
0
Beginning Date:
538.8
Ending Stage in Treatise Usage:
Lower Cambrian, Middle Cambrian, Upper Cambrian
Ending International Stage:
Cambrian Stage 10
Fraction Up In Ending Stage:
100
Ending Date:
486.85
Description
Ornament of fine, concentric growth lines, usually with additional irregular wavy ridges bearing minute granules, dorsal pseudointerarea forming obtusely triangular plate not raised above valve floor, internal pedicle tube absent, ventral larval shell with median tubercle