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Leangella
Classification
Phylum:
Brachiopoda
Class:
Strophomenata
Order:
Strophomenida
Superfamily:
Plectambonitoidea
Family:
Leptestiidae
Formal Genus Name and Reference:
Leangella ÖPIK, 1933a, p. 42
Type Species:
Plectambonites scissa (Davidson, 1871) var. triangularis HOLTEDAHL, 1916, p. 84, OD
Images
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Fig. 216, 3a-d. * L. (L.) scissa (Davidson), upper Haverford Mudstone Formation, Rhuddanian, Gasworks, Haverfordwest, Dyfed, Wales, $a$, latex of conjoined valves, BMNH BB 70996, X5, b, dorsal exterior latex, BMNH BB 31826, x5$ (new), $c, d$, mold, latex of dorsal interior, BMNH BB 32167, X6 (Cocks & Rong, 1989)., Fig. 216, 3e, f. L. (L.) tufogena, Liten Formation, Homerian, Hlinik, Svaty Jan pod Skalou, Bohemia, Czech Republic, e, ventral internal mold, OMR VH 290, x5, f$, dorsal internal mold, OMR VH 285, X5 (Havlíček, 1967)., Fig. 216, 3g. L. (L.) gibbosa, Stewartville Formation, lower Ashgill, Stewartville, Minnesota, dorsal interior, BMNH BC 7272, X5 (Cocks & Rong, 1989).
Synonyms
Diambonia, Opikella
Geographic Distribution
cosmopolitan
Age Range
Beginning Stage in Treatise Usage:
Ordovician (Caradoc)
Beginning International Stage:
Sandbian
Fraction Up In Beginning Stage:
0
Beginning Date:
458.18
Ending Stage in Treatise Usage:
Silurian (Ludlow)
Ending International Stage:
Ludfordian
Fraction Up In Ending Stage:
100
Ending Date:
422.73
Description
Strongly concavoconvex profile, unequally parvicostellate ornament, large orthocline interarea, strong teeth with small dental plates, ventral muscle field small, bilobed, with pronounced muscle-bounding ridges, subperipheral rim variably present in ventral valve, ventral median septum varying from strong to absent, erect cardinal process, laterally flaring socket ridges, weak myophragm, dorsal median septum absent, elevated bema bilobed, undercut anteriorly, platform or discontinuous row of enhanced septules, diaphragm or peripheral rim near valve margin. L. (Leangella) is similar to L. (Leptestiina) but with a discrete platform.