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Gotatrypa
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Atrypida
Superfamily:
Atrypoidea
Family:
Atrypidae
Formal Genus Name and Reference:
Gotatrypa STRUVE, 1966, p. 130
Type Species:
Atrypa (Gotatrypa) hedei, OD
Images
(Click to enlarge in a new window)
Fig. 945, 1a–g. *G. hedei, Telychian, Gotland; a–d, dorsal, ventral, posterior, lateral views, ×2; e–g, serial sections, ×5 (new).
Synonyms
Geographic Distribution
worldwide
Age Range
Beginning Stage in Treatise Usage:
Silurian (Aeronian)
Beginning International Stage:
Aeronian
Fraction Up In Beginning Stage:
0
Beginning Date:
440.49
Ending Stage in Treatise Usage:
Silurian (Telychian, ?Wenlock)
Ending International Stage:
Homerian
Fraction Up In Ending Stage:
100
Ending Date:
426.74
Description
Small to medium, globose, ventribiconvex to biconvex to weakly dorsibiconvex; minute, adpressed area; foramen transapical or obscured; deltidial plates absent, except in neanic stages; fine ribs intersected by closely spaced, weak, wavelike growth lamellae, projected less than 2 to 3 mm, commonly pointed as spines and longer in rib troughs; frills absent; pedicle callist moderate; teeth with dental nuclei; crura thin, rarely bushy; spiralia dorsomedial, fewer than 8 to 12 whorls; short, centroposterior jugal processes with small jugal plates. [ Differs from Atrypa in convexity, globose shape, closely spaced, overlapping growth lamellae, lack of frills, Distinguished from Oglupes by small size, very fine ribs, very short frills]
References
Museum or Author Information
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Atrypida
Superfamily:
Atrypoidea
Family:
Atrypidae
Formal Genus Name and Reference:
Gotatrypa STRUVE, 1966, p. 130
Type Species:
Atrypa (Gotatrypa) hedei, OD
Images
(Click to enlarge in a new window)
Fig. 945, 1a–g. *G. hedei, Telychian, Gotland; a–d, dorsal, ventral, posterior, lateral views, ×2; e–g, serial sections, ×5 (new).
Synonyms
Geographic Distribution
worldwide
Age Range
Beginning Stage in Treatise Usage:
Silurian (Aeronian)
Beginning International Stage:
Aeronian
Fraction Up In Beginning Stage:
0
Beginning Date:
440.49
Ending Stage in Treatise Usage:
Silurian (Telychian, ?Wenlock)
Ending International Stage:
Homerian
Fraction Up In Ending Stage:
100
Ending Date:
426.74
Description
Small to medium, globose, ventribiconvex to biconvex to weakly dorsibiconvex; minute, adpressed area; foramen transapical or obscured; deltidial plates absent, except in neanic stages; fine ribs intersected by closely spaced, weak, wavelike growth lamellae, projected less than 2 to 3 mm, commonly pointed as spines and longer in rib troughs; frills absent; pedicle callist moderate; teeth with dental nuclei; crura thin, rarely bushy; spiralia dorsomedial, fewer than 8 to 12 whorls; short, centroposterior jugal processes with small jugal plates. [ Differs from Atrypa in convexity, globose shape, closely spaced, overlapping growth lamellae, lack of frills, Distinguished from Oglupes by small size, very fine ribs, very short frills]