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Atrypinella
Classification
Phylum:
Brachiopoda
Subphylum:
Rhynchonelliformea
Class:
Rhynchonellata
Order:
Atrypida
Suborder:
Atrypidina
Superfamily:
Punctatrypoidea
Family:
Punctatrypidae
Subfamily:
Atrypinellinae
Formal Genus Name and Reference:
Atrypinella KHODALEVICH, 1939, p. 45
Type Species:
Atrypa (Atrypinella) biloba, OD
Images
(Click to enlarge in a new window)
Fig. 975, 1 a-d. *A. biloba (Khodalevich), Lochkovian, Urals, dorsal, ventral, lateral, anterior views, x1 (Khodalevich, 1939).--Fig. 975, 1e-f. A. losvensis (Khodalevich), upper Lochkovianlower Pragian, eastern slopes, Urals, serial sections, x2 (Mizens, 1984).
Synonyms
Geographic Distribution
Urals, central Asia, western Europe, arctic Canada
Age Range
Beginning Stage in Treatise Usage:
Silurian (Pridoli)
Beginning International Stage:
Pridoli
Fraction Up In Beginning Stage:
0
Beginning Date:
422.73
Ending Stage in Treatise Usage:
Lower Devonian (Emsian)
Ending International Stage:
Emsian
Fraction Up In Ending Stage:
100
Ending Date:
394.3
Description
Small to medium, rounded, globose, bilobate to biconvex, both valves normally sulcate, ventral valve subcarinate posteriorly, finely ribbed, with decorticated shell giving granulose appearance, closely spaced, flat, short growth lamellae, ligate to rectimarginate commissure, short teeth, possessing nuclei or small dental cavities, hinge socket plates thick, dorsal spiralia with fewer than 6 whorls, jugal processes thin, ventromedial to medial, almost touching. [Differs from Reticulatrypa in subcarinate, bisulcate shell, includes well-known A. granulifera (Barrande, 1879b).]
References
Museum or Author Information
Classification
Phylum:
Brachiopoda
Subphylum:
Rhynchonelliformea
Class:
Rhynchonellata
Order:
Atrypida
Suborder:
Atrypidina
Superfamily:
Punctatrypoidea
Family:
Punctatrypidae
Subfamily:
Atrypinellinae
Formal Genus Name and Reference:
Atrypinella KHODALEVICH, 1939, p. 45
Type Species:
Atrypa (Atrypinella) biloba, OD
Images
(Click to enlarge in a new window)
Fig. 975, 1 a-d. *A. biloba (Khodalevich), Lochkovian, Urals, dorsal, ventral, lateral, anterior views, x1 (Khodalevich, 1939).--Fig. 975, 1e-f. A. losvensis (Khodalevich), upper Lochkovianlower Pragian, eastern slopes, Urals, serial sections, x2 (Mizens, 1984).
Synonyms
Geographic Distribution
Urals, central Asia, western Europe, arctic Canada
Age Range
Beginning Stage in Treatise Usage:
Silurian (Pridoli)
Beginning International Stage:
Pridoli
Fraction Up In Beginning Stage:
0
Beginning Date:
422.73
Ending Stage in Treatise Usage:
Lower Devonian (Emsian)
Ending International Stage:
Emsian
Fraction Up In Ending Stage:
100
Ending Date:
394.3
Description
Small to medium, rounded, globose, bilobate to biconvex, both valves normally sulcate, ventral valve subcarinate posteriorly, finely ribbed, with decorticated shell giving granulose appearance, closely spaced, flat, short growth lamellae, ligate to rectimarginate commissure, short teeth, possessing nuclei or small dental cavities, hinge socket plates thick, dorsal spiralia with fewer than 6 whorls, jugal processes thin, ventromedial to medial, almost touching. [Differs from Reticulatrypa in subcarinate, bisulcate shell, includes well-known A. granulifera (Barrande, 1879b).]