Platidia Sous-embranchement (subphylum) des Rhynchonelliformea Classe des Rhynchonellata Ordre des Terebratulida Sous-Ordre des Terebratellidina Super-famille des Platidoidea

Genus Platidia Costa, 1852

[Type species= Orthis anomioides Scacchi & Philippi, 1844 in Philippi, 1844 (p. 69)] Synonyms : Morrisia Davidson, 1852, Platydia Seguenza (1870)

Small, subcircular to subquadrate in outline, planoconvex, thin shelled, semitransparent; smooth, or with radiating lines or spinules on ventral valve; hinge line wide, foramen large, amphithyrid; deltidial plates very narrow, disjunct. Pedicle collar short, sessile; hinge teeth with narrow dental plates and grooved, swollen bases; short ventral myophragm. Cardinal process absent; inner socket ridges strong; outer socket ridges narrow; no hinge plates; septal pillar located directly anterior to large amphithyrid pedicle embayment, bladelike and leaning anteriorly proximally but posteriorly deflected distally and terminating in a pair of posteriorly directed, Ushaped septal flanges; crura long and slender with short processes, descending branches strongly arcuate, uniting medianly with lateral flanks of Ushaped septal flanges. Lophophore zygolophous.

Danian - Present Diagnosis from volume 5 of the Treatise on Invertebrate Paleontology (2006)

Extant Species of Platidia

P. anomioides (Scacchi & Philippi, 1844 in Philippi, 1844) P. clepsidra Cooper, 1973 ? P. concentrica Zezina, 1980 > see P. anomioides

Diagnosis

FIGURES : Platidia      Geographic distribution