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Atrypoidea
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Atrypida
Superfamily:
Lissatrypoidea
Family:
Lissatrypidae
Formal Genus Name and Reference:
Atrypoidea Mitchell & DUN, 1920, p. 271
Type Species:
Meristina (?) australis DUN, 1904, p. 318, OD
Images
(Click to enlarge in a new window)
Fig. 990 a. *A. (A.) australis (Dun), Ludlow, New South Wales, Australia, reconstruction from serial sections, x4$ (Copper, 1977b)., ——Fig. 990b-g. A. (A.) prunum (Dalman), middle Ludlow, Gotland, $b-e$, dorsal, posterior, anterior, lateral views, x2, f-g$, serial sections, x4$ (Copper, 1977b).
Synonyms
Atrypella, Lingatrypa, Globatrypa
Geographic Distribution
China, Urals, ?Aeronian; worldwide, Wenlock–Prídolí; ˇ Czech Republic, ?Lochkovian.
Age Range
Beginning Stage in Treatise Usage:
Silurian (?middle Llandovery, upper Wenlock)
Beginning International Stage:
Aeronian
Fraction Up In Beginning Stage:
66
Beginning Date:
439.24
Ending Stage in Treatise Usage:
Silurian (Prídolí), Lower Devonian (?Lochkovian)
Ending International Stage:
Lochkovian
Fraction Up In Ending Stage:
100
Ending Date:
412.4
Description
Medium to large, globose, wide to elongate, convexoplane-dorsibiconvex, shell smooth, may be partly corrugate on anterior fold, small apical-transapical foramen, deltidial plates in neanic shells, orthocline-anacline area in small shells, hypercline area in large shells, weak to strongly plicate commissure, thick shell wall with muscle scars weakly incised, solid teeth, relatively delicate hinge, socket plates, small crural bases, dorsal-dorsolateral spiralia, ventrally positioned jugal processes with bulky jugal plates. [ Differs from Lissatrypa and Meifodia in inflated size, elongate shape, hinge plates, stumpy jugal processes.]
References
Museum or Author Information
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Atrypida
Superfamily:
Lissatrypoidea
Family:
Lissatrypidae
Formal Genus Name and Reference:
Atrypoidea Mitchell & DUN, 1920, p. 271
Type Species:
Meristina (?) australis DUN, 1904, p. 318, OD
Images
(Click to enlarge in a new window)
Fig. 990 a. *A. (A.) australis (Dun), Ludlow, New South Wales, Australia, reconstruction from serial sections, x4$ (Copper, 1977b)., ——Fig. 990b-g. A. (A.) prunum (Dalman), middle Ludlow, Gotland, $b-e$, dorsal, posterior, anterior, lateral views, x2, f-g$, serial sections, x4$ (Copper, 1977b).
Synonyms
Atrypella, Lingatrypa, Globatrypa
Geographic Distribution
China, Urals, ?Aeronian; worldwide, Wenlock–Prídolí; ˇ Czech Republic, ?Lochkovian.
Age Range
Beginning Stage in Treatise Usage:
Silurian (?middle Llandovery, upper Wenlock)
Beginning International Stage:
Aeronian
Fraction Up In Beginning Stage:
66
Beginning Date:
439.24
Ending Stage in Treatise Usage:
Silurian (Prídolí), Lower Devonian (?Lochkovian)
Ending International Stage:
Lochkovian
Fraction Up In Ending Stage:
100
Ending Date:
412.4
Description
Medium to large, globose, wide to elongate, convexoplane-dorsibiconvex, shell smooth, may be partly corrugate on anterior fold, small apical-transapical foramen, deltidial plates in neanic shells, orthocline-anacline area in small shells, hypercline area in large shells, weak to strongly plicate commissure, thick shell wall with muscle scars weakly incised, solid teeth, relatively delicate hinge, socket plates, small crural bases, dorsal-dorsolateral spiralia, ventrally positioned jugal processes with bulky jugal plates. [ Differs from Lissatrypa and Meifodia in inflated size, elongate shape, hinge plates, stumpy jugal processes.]