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Eohadrotreta
Classification
Phylum:
Brachiopoda
Subphylum:
Linguliformea
Class:
Lingulata
Order:
Acrotretida
Superfamily:
Acrotretoidea
Family:
Acrotretidae
Formal Genus Name and Reference:
Eohadrotreta Li & HOLMER, 2004, p. 204
Type Species:
E. zhenbaensis, OD
Images
(Click to enlarge in a new window)
Fig. 1693a-h. *E. zhenbaensis, lower Shuijingtuo Formation, Qiongzhusian Stage, Xiaoyang section, Zhenba, South Shaanxi, a, dorsal valve exterior, NIGP135167, x47, b, dorsal valve interior, x50, c, oblique lateral view, NIGP135170, x80, d-e, holotype, ventral valve exterior, oblique posterior view, NIGP 135165, x40, f, oblique posterior view of dorsal valve exterior, NIGP135176, ×93, g, posterior view of complete articulated juvenile shell, NIGP 135175, x100, h, oblique anterior view of ventral valve interior, x80 (new), Fig. 1694a-c. *E. zhenbaensis, lower Shuijingtuo Formation, Qiongzhusian Stage, Xiaoyang section, Zhenba, South Shaanxi, a, oblique posterior view of unrestricted delthyrium, NIGP 135174, x400, b, ventral valve interior, NIGP135173, x60, c, detail of larval shell and pedicle foramen, NIGP135166, x200 (new)
Synonyms
Geographic Distribution
China (Shaanxi Province)
Age Range
Beginning Stage in Treatise Usage:
Lower Cambrian
Beginning International Stage:
Fortunian
Fraction Up In Beginning Stage:
0
Beginning Date:
538.8
Ending Stage in Treatise Usage:
Lower Cambrian
Ending International Stage:
Cambrian Stage 4
Fraction Up In Ending Stage:
40
Ending Date:
512.3
Description
Shell subcircular to transversely oval, with rounded to straight posterior margin, ventral valve low conical to gently convex, ventral pseudointerarea gently procline, with shallow to vestigial intertrough, pedicle foramen not enclosed within larval shell, remaining as open notch through much of ontogeny, apical process and apical pits vestigial to absent, dorsal valve gently convex, dorsal pseudointerarea narrowly triangular, orthocline, with median groove, dorsal median buttress well developed, dorsal median septum well developed, extending anterior to midvalve. Lower Cambrian: China (Shaanxi Province).
References
Museum or Author Information
Classification
Phylum:
Brachiopoda
Subphylum:
Linguliformea
Class:
Lingulata
Order:
Acrotretida
Superfamily:
Acrotretoidea
Family:
Acrotretidae
Formal Genus Name and Reference:
Eohadrotreta Li & HOLMER, 2004, p. 204
Type Species:
E. zhenbaensis, OD
Images
(Click to enlarge in a new window)
Fig. 1693a-h. *E. zhenbaensis, lower Shuijingtuo Formation, Qiongzhusian Stage, Xiaoyang section, Zhenba, South Shaanxi, a, dorsal valve exterior, NIGP135167, x47, b, dorsal valve interior, x50, c, oblique lateral view, NIGP135170, x80, d-e, holotype, ventral valve exterior, oblique posterior view, NIGP 135165, x40, f, oblique posterior view of dorsal valve exterior, NIGP135176, ×93, g, posterior view of complete articulated juvenile shell, NIGP 135175, x100, h, oblique anterior view of ventral valve interior, x80 (new), Fig. 1694a-c. *E. zhenbaensis, lower Shuijingtuo Formation, Qiongzhusian Stage, Xiaoyang section, Zhenba, South Shaanxi, a, oblique posterior view of unrestricted delthyrium, NIGP 135174, x400, b, ventral valve interior, NIGP135173, x60, c, detail of larval shell and pedicle foramen, NIGP135166, x200 (new)
Synonyms
Geographic Distribution
China (Shaanxi Province)
Age Range
Beginning Stage in Treatise Usage:
Lower Cambrian
Beginning International Stage:
Fortunian
Fraction Up In Beginning Stage:
0
Beginning Date:
538.8
Ending Stage in Treatise Usage:
Lower Cambrian
Ending International Stage:
Cambrian Stage 4
Fraction Up In Ending Stage:
40
Ending Date:
512.3
Description
Shell subcircular to transversely oval, with rounded to straight posterior margin, ventral valve low conical to gently convex, ventral pseudointerarea gently procline, with shallow to vestigial intertrough, pedicle foramen not enclosed within larval shell, remaining as open notch through much of ontogeny, apical process and apical pits vestigial to absent, dorsal valve gently convex, dorsal pseudointerarea narrowly triangular, orthocline, with median groove, dorsal median buttress well developed, dorsal median septum well developed, extending anterior to midvalve. Lower Cambrian: China (Shaanxi Province).