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Orthis (Platystrophia) cypha

Rhynchonellata - Orthida - Platystrophiidae

Synonymy list
YearName and author
1874Orthis (Platystrophia) cypha James p. 20
1910Platystrophia cypha Foerste p. 61 figs. pl. 4 f. 10a-b; pl. 5 f. 11
1979Platystrophia cypha Alberstadt pp. B15 - B16 figs. Plate 5, figures 39, 40, 43, 44, 50, 52; plate 6, figures 14-18, 29-32; plate 7, figures 22-29
2007Vinlandostrophia cypha Zuykov and Harper figs. pl. 3 f. 4

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EubilateriaAx 1987
phylumBrachiopodaCuvier 1805
subphylumRhynchonelliformeaWilliams et al. 1996
classRhynchonellataWilliams et al. 1996
orderOrthidaSchuchert and Cooper 1932
suborderOrthidinaSchuchert and Cooper 1932
superfamilyPlectorthoideaSchuchert and Le Vene 1929
familyPlatystrophiidaeSchuchert 1929

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.

L. P. Alberstadt 1979Moderate size for genus (best preserved specimen: length, 16.0 mm; hinge width, 26.8 mm; midwidth, 23.7 mm; thickness, 16.1 mm; cardinal extremities acute to right angle. Hinge line the widest part, lateral margins straight, anterior margin straight. Lateral profile unequally biconvex with brachial valve about twice as deep; fold rises steadily from posterior to highest anterior extremity. Fold has four plications, two middle ones prominent with two lateral ones only poorly to moderately developed; six to seven plications on flank. Sulcus deep, bordered on each side by two prominent highly elevated plications. Flank of pedicle valve distinctly concave with asymmetrical plications; plication slopes facing cardinal extremities twice as long as opposite slopes. Flanks of brachial valve slightly convex, uneven plications.