Vinlandostrophia cypha

Classification
Phylum: Brachiopoda
Class: Rhynchonellata
Order: Orthida
Family: Platystrophiidae
Genus: Vinlandostrophia
Species: Vinlandostrophia cypha (James, 1874)

Taxonomic Details

Formerly: Platystrophia cypha

Stratigraphic Occurrences

vcypha strat

Geographic Occurrences

Map point data provided by iDigBio.

Stratigraphic Distribution

  • C5 Sequence (Liberty, Waynesville)
  • C4 Sequence (Arnheim)
  • C2 Sequence (Bellevue)
  • Identification in Hand Sample
    V.cypha identifier2

    • 9+ plications on either side of fold and sulcus
    • 2 plications on the fold
    • 1 plication on the sulcus
    • More mucronate (wing-line) cardinal extremities
    • Smooth lateral cardinal extremities

    Vinandostrophia cypha from Waynesville formation of Warren County, Ohio (OUIP 1472)

    Published Descriptions

    Brame (pers. comm., 2013):

    • Elongate (alate to mucronate) cardinal extremities; strong medial rib in sulcus; cardinal extremities of ventral valve are smooth and flattened; more than nine lateral plications.

    Davis (1998):

    • Articulate brachiopod. Differs from other species of Platystrophia by having a very strong median placation in the sulcus, by having the sides of the pedicle valve flattened and hollowed out, by having more than 9 plications on each side of the fold or sinus, and by having somewhat alate cardinal extremities. Ranges from McMillian – Liberty

    McFarlan (1931):

    • High fold; disappearance of lateral plications, leaving 2 prominent plications in fold, one in sinus.

    James (1874)

    • [Cypha, in allusion to the remarkably convexity of the dorsal valve] Shell medium size; extremely gibbous; hinge line forming spine like projections, being over two thirds longer than the greatest breadth of the shell below; shell broader than long; convexity equaling the body below the hinge extensions; cardinal area narrow, and finely striated at right angles with the length. Dorsal valve, remarkably elevated mesial fold, with slopes commencing a little below the beak, and extending to the front, at an angle of about 80 degrees to the main body of the shell, where they turn at nearly right angles and continue to the free margins; beak incurved, not elevated above the other valve; the mesial fold consist of two costae. Ventral valve, beak incurved, not elevated, nearly in contact with the other valve. Sinus very profound, extending to the front, which is bent over to nearly half the thickness of the shell beyond the cardinal line of the dorsal valve; one strong elevated plication in the center of the sinus, and an obscure rudimentary one on each side; lateral slopes concave.
    • Twenty-two to twenty-six angular costae on each valve, about 8 of which commence on the cardinal line, and do not extend to the beak.
    • The line of junction of the two valves is nearly flat, or slightly rounded, and has a remarkably zig-zag appearance, where the sinus and mesial fold join, like the letter W.
    • Interior unknown.
    • Width along the cardinal line one and a half inches, half way below the hinge line less than one inch; length three quarters of an inch.
    • This shell resembles somewhat some of the larger specimens of O.crassa Meek, but it is more gibbous, has a more profound and lengthy sinus, greater length of hinge line, and finer and more numerous costae.
    • Position and locality: Cincinnati Group, Warren county, Ohio.”