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Platystrophia colbiensis

Rhynchonellata - Orthida - Platystrophiidae

Synonymy list
YearName and author
1910Platystrophia colbiensis Foerste p. 55 figs. pl. 4, figs. 2A, B
1979Platystrophia colbiensis Alberstadt pp. B9-B10 figs. Plate 5, figures 1-36; plate 7, figures 36-38, 40, 41
1996Platystrophia colbiensis Jin and Norford pp. 28 - 29 figs. Plate 3, figures 1-6; Plate 13, figures 18-22

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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 1979Species small to medium size for genus (table 1); subrectangular in outline with right angle cardinal extremities in most, in some rounded; hinge line straight and slightly less than maximum width (which occurs at middle lateral position), anterolateral margins evenly curved, anterior margin slightly curved or straight. Lateral profile equi-biconvex with even curvature from posterior to anterior; pedicle valve slightly flatter in some. Typical specimen has four plications on fold and three in sulcus (table 1); six to nine plications on flanks. Plications well defined, V-shaped profile with straight steep sides, rounded tops. Growth lines absent in most specimens.

Brachial valve interarea orthocline, curved; beak slightly incurved to erect. No:tothyrium triangular, open. Floor of cavity curved and sloping st1e·eply toward anterior; part of floor formed by the curved lateral margins of the brachiophore bases (pl. 5, figs. 34-36). Brachiophores thin, well defined, diverging, distinct upward curvature. Sockets deep, triangular slits (pl. 5,.fig. 34) in som,e, pit-like in most. Cardinal process a thin lo·w ridge. Posterior adductor scars well to moderately impressed ( pL 5, figs. 26- 30), some absent (pl. 5, figs. 34, 35), elongate ellips ·oidal in outline with straight to moderately curved sides and distinctly pointed anterior ends (pl. 5, figs. 26-30). Anterior scars absent or very poorly defined in all specimens. Interior of valve crenulated throughout; crenulations are reflections of external plications (pl. 5, figs. 26-30, 34, 35).

Pedicle valve interarea apsacline, slightly curved; beak erect. Teeth triangular; dental plates thin, descending straight to floor of valve and joining margins of ellipsoidal to oval-shaped muscle field (pl. 5, figs. 32, 33). Field extends approximately onethird t.o one-half length of valve. Field elevated slightly above floor and defined by thin rims; some specimens with faint reflections of external plications. Interior of valve crenulated throughout.