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Leangella (Leangella) america
Taxonomy
Leangella (Leangella) america was named by Benedetto and Cocks (2009). Its type specimen is CEGH-UNC 23489, a valve (An internal mould of dorsal valve), and it is a mold. Its type locality is Mogotes Azules, which is in a Rhuddanian carbonate limestone in the La Chilca Formation of Argentina.
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 2009 | Leangella (Leangella) america Benedetto and Cocks figs. 3.1 - 3.12 |
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
†Leangella (Leangella) america Benedetto and Cocks 2009
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. Benedetto and L. R. M. Cocks 2009 | Like L. scissa apart from the evenly-rounded semicircular platform rim.
Shell small, semielliptical, up to 11.5 mm wide, strongly concavoconvex, on average 65 % as long as wide. Cardinal extremities acute. Ventral valve strongly convex in lateral profile, with maximum thickness slightly posterior to mid-length. Ventral interarea plane, apsacline. Delthyrium partially filled by apical thickening. Dorsal valve moderately and evenly concave, with narrow, hypercline interarea. Radial ornament unequally parvicostellate with 7-9 accentuated fine ribs originated at the umbo. Parvicostellae not preserved. Ventral interior with small, subtriangular, widely divergent teeth supported by thin dental plates prolonged anteriorly by ridges which bound laterally the muscle field. Highly raised, bilobed ventral muscle field about 50 % as long as wide, with strongly impressed diductor scars. Adductor scars indistinguishable. A low ventral platform usually present. Mantle canals with narrow vascula media subparallel or gently diverging anteriorly. Dorsal interior with trilobate cardinal process and widely divergent socket ridges nearly parallel to hinge; dental sockets transversely elongated. Bema prominent, bilobed, strongly raised and free anteriorly, 50% as long as wide, extending anteriorly about 40-60% of valve length. Bema surface with fine radial ridges, more prominent near its margins. Platform evenly-rounded, semicircular, running subparallel close to the valve margin |