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Apsotreta
Classification
Phylum:
Brachiopoda
Subphylum:
Linguliformea
Class:
Lingulata
Order:
Acrotretida
Superfamily:
Acrotretoidea
Family:
Acrotretidae
Formal Genus Name and Reference:
Apsotreta PALMER, 1954, p. 770
Type Species:
A. expansa, OD
Images
(Click to enlarge in a new window)
Fig. 53, 4a-f. *A. expansa, upper Dresbachian, Dunderbergia Biozone, central Texas, a, b, dorsal valve interior, oblique lateral view, RMS Br 136394, X16.7, c, lateral view of ventral valve exterior, x20, detail of ventral larval shell, RMS Br 136395, x123, e, oblique anterior view of ventral valve interior, RMS Br 136397, x40, f, ventral valve interior, RMS Br 136396, x20 (new).
Synonyms
Geographic Distribution
USA (Missouri, Texas)
Age Range
Beginning Stage in Treatise Usage:
Upper Cambrian
Beginning International Stage:
Guzhangian
Fraction Up In Beginning Stage:
50
Beginning Date:
498.75
Ending Stage in Treatise Usage:
Upper Cambrian
Ending International Stage:
Cambrian Stage 10
Fraction Up In Ending Stage:
100
Ending Date:
486.85
Description
Shell subcircular with short, weakly convex anterior margin, ventral valve strongly convex to low subconical, pseudointerarea low, apsacline with interridge, short external pedicle tube enclosed within larval shell, dorsal pseudointerarea well developed with broadly triangular median groove and short orthocline to anacline propareas, broad, ridgelike apical process mainly on anterior slope, long, parallel-sided or expanding anteriorly, dorsal interior with low triangular median septum, elongate median buttress. Upper Cambrian: USA (Missouri, Texas).
References
Museum or Author Information
Classification
Phylum:
Brachiopoda
Subphylum:
Linguliformea
Class:
Lingulata
Order:
Acrotretida
Superfamily:
Acrotretoidea
Family:
Acrotretidae
Formal Genus Name and Reference:
Apsotreta PALMER, 1954, p. 770
Type Species:
A. expansa, OD
Images
(Click to enlarge in a new window)
Fig. 53, 4a-f. *A. expansa, upper Dresbachian, Dunderbergia Biozone, central Texas, a, b, dorsal valve interior, oblique lateral view, RMS Br 136394, X16.7, c, lateral view of ventral valve exterior, x20, detail of ventral larval shell, RMS Br 136395, x123, e, oblique anterior view of ventral valve interior, RMS Br 136397, x40, f, ventral valve interior, RMS Br 136396, x20 (new).
Synonyms
Geographic Distribution
USA (Missouri, Texas)
Age Range
Beginning Stage in Treatise Usage:
Upper Cambrian
Beginning International Stage:
Guzhangian
Fraction Up In Beginning Stage:
50
Beginning Date:
498.75
Ending Stage in Treatise Usage:
Upper Cambrian
Ending International Stage:
Cambrian Stage 10
Fraction Up In Ending Stage:
100
Ending Date:
486.85
Description
Shell subcircular with short, weakly convex anterior margin, ventral valve strongly convex to low subconical, pseudointerarea low, apsacline with interridge, short external pedicle tube enclosed within larval shell, dorsal pseudointerarea well developed with broadly triangular median groove and short orthocline to anacline propareas, broad, ridgelike apical process mainly on anterior slope, long, parallel-sided or expanding anteriorly, dorsal interior with low triangular median septum, elongate median buttress. Upper Cambrian: USA (Missouri, Texas).