. Bulletins of American paleontology. 8i Upper Ordovician Enoploura: Caster adjacent to the peduncle the basal ventral plates rise to a low axial convexity. Corresponding in position to two anteriorly converging carinae on the internal surfaces of the ventral medial plates, a con- spicuous furrowing occurs on the ventral surface from the posterior lateral angles to about the mid-point of the large central (hypocentral) plate. This delimits a ver\' characteristic depressed isosceles triangular area in this genus and certain other mitrate carpoids. The posterior ventral margin is deeply and arcu
. Bulletins of American paleontology. 8i Upper Ordovician Enoploura: Caster adjacent to the peduncle the basal ventral plates rise to a low axial convexity. Corresponding in position to two anteriorly converging carinae on the internal surfaces of the ventral medial plates, a con- spicuous furrowing occurs on the ventral surface from the posterior lateral angles to about the mid-point of the large central (hypocentral) plate. This delimits a ver\' characteristic depressed isosceles triangular area in this genus and certain other mitrate carpoids. The posterior ventral margin is deeply and arcuatelv emarginate for the peduncle insertion. This margin of the plastron is strengthened by a raised Fig. I. Two views of the holotype of Enoploura pope'i Caster, n. sp., demonstrating the nomenclature of the carapace plates. Left figure represents the concave side or plastron; right figure the convex side, or carapace. The broken lines show the position of the anteriorly converging carinae on the inner surface of the plastron. A, irregular hypocentral ("anomalo(;ystid") plate; aim, anterior lateral marginals; am, right and left adtegmenals; (IX, axillaries, or sub-brachials; bm, medial adcolumnals or basal median plates; br, brachiole; cs, hypocentral, epibasal or central somatic plate; ib, interbasal plates; L, left side; lac, lateral adcolumnals; lam, lateral anterior marginal somatics; M, dorsal median adtegmenal plate; mi, mz, m^, m^, dorsal epibasals, or median somatic (epicentral) plates; mac, median adcolumnals; mam, median adtegmenal plates; mlm, median lateral mar- ginals; ms, median somatic or hypocentral plate; plm, posterior lateral marginals; pp, peduncular or styloid process (stylocone) ; R, right side. Drawings by Anneliese S. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the origin
Size: 1599px × 1562px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorpaleontologicalresearchinstitutionit, bookcentury1900
