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Acrospirifer
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Spiriferida
Superfamily:
Delthyriodoidea
Family:
Acrospiriferidae
Formal Genus Name and Reference:
Acrospirifer Helmbrecht & WEDEKIND, 1923, p. 952
Type Species:
Spirifera primaeva Steininger, 1853, p. 72, SD WEDEKIND, 1926, p. 202
Images
(Click to enlarge in a new window)
Fig. 1220, 1a-d. * A. primaevus (STEININGER), Pragian, Germany; a–b, ventral and dorsal exteriors; c–d, molds of ventral and dorsal interiors, ×1 (Maillieux, 1931).
Synonyms
Geographic Distribution
Europe, northern Africa
Age Range
Beginning Stage in Treatise Usage:
Lower Devonian (Pragian)
Beginning International Stage:
Pragian
Fraction Up In Beginning Stage:
0
Beginning Date:
412.4
Ending Stage in Treatise Usage:
Lower Devonian (Emsian)
Ending International Stage:
Emsian
Fraction Up In Ending Stage:
100
Ending Date:
394.3
Description
Large, biconvex, with obtuse cardinal angles, ventral interarea curved, apsacline, fold and sulcus smooth, flanks with few strong, simple plications, dental plates divergent, ventral diductor muscle field impressed in thick callus, broad ctenophoridium may be slightly elevated.
References
Museum or Author Information
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Spiriferida
Superfamily:
Delthyriodoidea
Family:
Acrospiriferidae
Formal Genus Name and Reference:
Acrospirifer Helmbrecht & WEDEKIND, 1923, p. 952
Type Species:
Spirifera primaeva Steininger, 1853, p. 72, SD WEDEKIND, 1926, p. 202
Images
(Click to enlarge in a new window)
Fig. 1220, 1a-d. * A. primaevus (STEININGER), Pragian, Germany; a–b, ventral and dorsal exteriors; c–d, molds of ventral and dorsal interiors, ×1 (Maillieux, 1931).
Synonyms
Geographic Distribution
Europe, northern Africa
Age Range
Beginning Stage in Treatise Usage:
Lower Devonian (Pragian)
Beginning International Stage:
Pragian
Fraction Up In Beginning Stage:
0
Beginning Date:
412.4
Ending Stage in Treatise Usage:
Lower Devonian (Emsian)
Ending International Stage:
Emsian
Fraction Up In Ending Stage:
100
Ending Date:
394.3
Description
Large, biconvex, with obtuse cardinal angles, ventral interarea curved, apsacline, fold and sulcus smooth, flanks with few strong, simple plications, dental plates divergent, ventral diductor muscle field impressed in thick callus, broad ctenophoridium may be slightly elevated.