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Leptellina
Classification
Phylum:
Brachiopoda
Class:
Strophomenata
Order:
Strophomenida
Superfamily:
Plectambonitoidea
Family:
Leptellinidae
Formal Genus Name and Reference:
Leptellina Ulrich & COOPER, 1936b, p. 626
Type Species:
L. tennesseensis, OD
Images
(Click to enlarge in a new window)
Fig. 206,1f–i. L. (L.) qianjiangensis (LIANG), Changwu Formation, middle Ashgill, Jianglütang, Chunan County, western Zhejiang Province, China; f, dorsal view of external mold of conjoined valves, showing interarea, HIGS 04351, ×2; g,h, holotype, internal mold of ventral valve, HIGS 04312, ×2; i, dorsal view of internal mold of conjoined valves, HIGS 04322, × 1.8 (Liu, Xu, & Liang, 1983).
Synonyms
Urbimena, Qianjiangella
Geographic Distribution
cosmopolitan
Age Range
Beginning Stage in Treatise Usage:
Ordovician (?Arenig)
Beginning International Stage:
Floian
Fraction Up In Beginning Stage:
0
Beginning Date:
477.08
Ending Stage in Treatise Usage:
Silurian (Telychian)
Ending International Stage:
Telychian
Fraction Up In Ending Stage:
100
Ending Date:
432.93
Description
Concavoconvex profile, unequally parvicostellate ornament, sometimes with comae, relatively large interarea, small pseudodeltidium in apex of delthyrium, chilidium absent, small dental plates, bounding ridges posterolateral to bilobed ventral valve muscle field (often less than quarter valve length), subperipheral rims sometimes present, thin central ridge to cardinal process set low relative to hinge line, with lateral components less prominent (only thin central process projecting posteriorly from hinge line, even this is sometimes entirely anterior to hinge line), median septum elevated anteriorly to merge with variably elevated platform
References
Museum or Author Information
Classification
Phylum:
Brachiopoda
Class:
Strophomenata
Order:
Strophomenida
Superfamily:
Plectambonitoidea
Family:
Leptellinidae
Formal Genus Name and Reference:
Leptellina Ulrich & COOPER, 1936b, p. 626
Type Species:
L. tennesseensis, OD
Images
(Click to enlarge in a new window)
Fig. 206,1f–i. L. (L.) qianjiangensis (LIANG), Changwu Formation, middle Ashgill, Jianglütang, Chunan County, western Zhejiang Province, China; f, dorsal view of external mold of conjoined valves, showing interarea, HIGS 04351, ×2; g,h, holotype, internal mold of ventral valve, HIGS 04312, ×2; i, dorsal view of internal mold of conjoined valves, HIGS 04322, × 1.8 (Liu, Xu, & Liang, 1983).
Synonyms
Urbimena, Qianjiangella
Geographic Distribution
cosmopolitan
Age Range
Beginning Stage in Treatise Usage:
Ordovician (?Arenig)
Beginning International Stage:
Floian
Fraction Up In Beginning Stage:
0
Beginning Date:
477.08
Ending Stage in Treatise Usage:
Silurian (Telychian)
Ending International Stage:
Telychian
Fraction Up In Ending Stage:
100
Ending Date:
432.93
Description
Concavoconvex profile, unequally parvicostellate ornament, sometimes with comae, relatively large interarea, small pseudodeltidium in apex of delthyrium, chilidium absent, small dental plates, bounding ridges posterolateral to bilobed ventral valve muscle field (often less than quarter valve length), subperipheral rims sometimes present, thin central ridge to cardinal process set low relative to hinge line, with lateral components less prominent (only thin central process projecting posteriorly from hinge line, even this is sometimes entirely anterior to hinge line), median septum elevated anteriorly to merge with variably elevated platform