A New Extinct Emydid Turtle from the Lower Pliocene of Oklahoma

by Edwin C. Galbreath

Nuchal: Width of anterior margin, 12 (estimated); greatest width, 37 (estimated); length at midline, 35 (estimated).

First neural: Greatest width, 13; length at midline, 17. Second neural: Greatest width, 16; length at midline, 14. Third neural: Greatest width, 18; length at midline, 16. Fourth neural: Greatest width, 18; length at midline, 16.

Costals: Thickness at proximal end, 3-5; thickness at distal end, 2. First costal: Length of margin bordering nuchal, 23 (this and the following measurements of the costal and marginal plates are of plates from the right side of the animal except those indicated by an "L"); length of margin bordering neurals, 17; length of margin bordering marginals, 38; length of margin bordering 2d costal, 51. Second costal: Length of margin bordering 1st costal, 53; length of margin bordering neurals, 16; length of margin bordering marginals, 25; length of margin bordering 3d costal, 56. Third costal: Length of margin bordering 2d costal, 55 (L), 56; length of margin bordering neurals, 19; length of margin bordering marginals, 18; length of margin bordering 4th costal, 58. Fourth costal: Length of margin bordering 3d costal, 58; length of margin bordering neurals, 16; length of margin bordering marginals, 22; length of margin bordering 5th costal, 55. Fifth costal: Length of margin bordering 4th costal, 52; length of margin bordering neurals, 16; length of margin bordering marginals, 20; length of margin bordering 6th costal, 41.

First marginal: Length of margin bordering nuchal, 23 (L), 21; length of outer margin, 23 (L), 23; length of inner margin, 12 (L), 12; length of margin bordering 2d marginal, 22 (L), 21. Second marginal: Length of margin bordering 1st marginal, 22 (L); length of outer margin, 22 (L); length of inner margin, 15 (L); length of margin bordering 3d marginal, 16 (L). Seventh marginal: Length of margin bordering 6th marginal, 18 (L), 17 (estimated); length of outer margin, 25 (L), 23 (estimated); length of inner margin, 18 (L), 18; length of margin bordering 8th marginal, 22 (L), 22. Eighth marginal: Length of margin bordering 7th marginal, 22 (L), 23; length of outer margin, 22 (estimate of L), 22; length of inner margin, 18 (L), 18; length of margin bordering 9th marginal, 24 (estimate of L), 23. Ninth marginal: Length of margin bordering 8th marginal, 24 (L); length of outer margin, 20 (L), 19; length of inner margin, 19 (L); length of margin bordering 10th marginal, 23 (L), 23. Eleventh marginal: Length of margin bordering 10th marginal, 22 (L); length of outer margin, 16 (L); length of inner margin, 12 (L); length of margin bordering pygal, 18 (L).

Entoplastron: Width, 24 (estimated).

Hyoplastron: Length of margin bordering epiplastron, 25; length of margin on midline, 37; length from junction of epiplastronal border and outer border to point on posterior border equidistant from midline, 53; width from midline to axillary notch, 39; distance between axillary notch and posterior border, 31.

Hypoplastron: Length of margin bordering midline, 42; length of posterior (xiphiplastronal) margin, 40; distance from junction of xiphiplastronal margin and outer margin to point on anterior border equidistant from midline, 49 (estimated); distance between inguinal notch and anterior border, 29.

Xiphiplastron: Length of anterior (hypoplastronal) margin, 38; length of margin along midline, 43; distance from extreme posterior extension of xiphiplastron to midline, 14.

Scutes of Carapace and Plastron

First marginal scute: Length of margin bordering 2d marginal, 15 (L), 14; length of anterior margin, 15 (L); length of posterior margin, 14 (L); length of inner margin, 13 (L); length of outer margin, 23 (L). Third marginal scute: Length of anterior margin, 14 (L). Eighth marginal scute: Length of anterior margin, 15 (L), 15; length of posterior margin, 16 (estimate of L), 16; length of inner margin, 20 (L), 20; length of outer margin, 25 (estimate of L), 25. Ninth marginal scute: Length of anterior margin, 17 (L), 16; length of posterior margin, 17 (L), 17; length of inner margin, 18 (L), 20; length of outer margin, 21 (L), 21. Tenth marginal scute: Length of anterior margin, 17 (L), 17. Eleventh marginal scute: Length of posterior margin, 14 (L).