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6 results for “Discoscaphites”
Geographic and temporal morphological stasis in the latest Cretaceous ammonoid Discoscaphites iris from the U.S. Gulf and Atlantic Coastal Plains
<p class="MsoNormal"><span>We examine temporal and spatial variation in morphology of the ammonoid cephalopod <em>Discoscaphites iris</em> using a large dataset from multiple localities in the Late Cretaceous (Maastrichtian) of the United States Gulf and Atlantic Coastal Plains, spanning a distance of 2000 km along the paleoshoreline. Our results suggest that the fossil record of <em>D. iris </em>is consistent with no within species net accumulation of phyletic evolutionary change across morphological traits or the lifetime of this species. Correlations between some traits and paleoenvironmental conditions as well as changes in the coefficient of variation may support limited population-scale ecophenotypic plasticity, however where stratigraphic data are available, no directional changes in morphology occur prior to the Cretaceous/Paleogene (K/Pg) boundary. This is consistent with models of 'dynamic' evolutionary stasis. Combined with knowledge of life history traits and paleoecology of scaphitid ammonoids, specifically a short planktonic phase after hatching followed by transition to a nektobenthic adult stage, these data suggest that scaphitids had significant potential for rapid morphological change in conjunction with limited dispersal capacity. It is therefore likely that evolutionary mode in the Scaphitidae (and potentially across the broader ammonoid clade) follows a model of cladogenesis wherein a dynamic morphological stasis is periodically interrupted by more substantial evolutionary change at speciation events. Finally, the lack of temporal changes in our data suggest that global environmental changes (such as those possibly related to the emplacement of the Deccan Traps Large Igneous Province) had a limited effect on the morphology of North American ammonoid faunas during the latest Cretaceous prior to the K/Pg mass extinction event.</span></p>
Fig. 52. Discoscaphites jerseyensis, n in CEPHALOPODS FROM THE CRETACEOUS/TERTIARY BOUNDARY INTERVAL ON THE ATLANTIC COASTAL PLAIN, WITH A DESCRIPTION OF THE HIGHEST AMMONITE ZONES IN NORTH AMERICA. PART III. MANASQUAN RIVER BASIN, MONMOUTH COUNTY, NEW JERSEY
Fig. 52. Discoscaphites jerseyensis, n.sp., macroconchs, Pinna Layer, top of the Tinton Formation, Manasquan River Basin, Monmouth County, New Jersey. A–D. AMNH 50393, holotype. A. Right lateral; B. apertural; C. ventral; D. left lateral. E–H. AMNH 50774, paratype. E. Right lateral; F. apertural; G. ventral; H. left lateral. All figures X1.
Fig. 20. Discoscaphites minardi, n in Cephalopods from the Cretaceous/Tertiary Boundary Interval on the Atlantic Coastal Plain, with a Description of the Highest Ammonite Zones in North America. Part 1. Maryland and North Carolina
Fig. 20. Discoscaphites minardi, n.sp., dimorph indeterminate, AMNH loc. 3252, Severn Formation, Kent County, Maryland. A–D. AMNH 47298. A, Right lateral; B, apertural; C, ventral; D, left lateral. E–H. AMNH 49425. E, Right lateral, F, apertural; G, ventral; H, left lateral. I. AMNH 47296, left lateral. J–L. AMNH 47280. J, Right lateral; K, ventral; L, left lateral. M–O. AMNH 47479. M, Right lateral; N, apertural; O, ventral. P, Q. AMNH 49422. P, Right lateral; Q, ventral. R–U. AMNH 49424. R, Right lateral; S, apertural; T, ventral; U, left lateral. V–Y. AMNH 47285. V, Right lateral; W, apertural; X, ventral; Y, left lateral. All figures ×1.
Fig. 19. Discoscaphites minardi, n in Cephalopods from the Cretaceous/Tertiary Boundary Interval on the Atlantic Coastal Plain, with a Description of the Highest Ammonite Zones in North America. Part 1. Maryland and North Carolina
Fig. 19. Discoscaphites minardi, n.sp., AMNH loc. 3252, Severn Formation, Kent County, Maryland. A–K. Macroconchs. A–C. AMNH 49406. A, Right lateral; B, apertural; C, ventral. D–G. AMNH 47290. D, Right lateral; E, apertural; F, ventral; G, left lateral. H–K. AMNH 47299. H, Right lateral, I, apertural; J, ventral; K, left lateral. L–Z, a–g. Microconchs. L, M. AMNH 47294. L, Right lateral; M, ventral. N–Q, AMNH 47289. N, Right lateral; O, apertural; P, ventral; Q, left lateral. R, S. AMNH
Fig. 18. A–Q, S–Y. Discoscaphites minardi, n in Cephalopods from the Cretaceous/Tertiary Boundary Interval on the Atlantic Coastal Plain, with a Description of the Highest Ammonite Zones in North America. Part 1. Maryland and North Carolina
Fig. 18. A–Q, S–Y. Discoscaphites minardi, n.sp., macroconchs, AMNH loc. 3252, Severn Formation, Kent County, Maryland. A–D. Holotype, AMNH 47288. A, Right lateral; B, apertural; C, ventral; D, left lateral. E–G. AMNH 47281. E, Right lateral; F, ventral; G, left lateral. H–K. Paratype, AMNH 47293. H, Right lateral; I, apertural; J, ventral; K, left lateral. L–N. AMNH 47295. L, Right lateral; M, ventral; N, left lateral. O–Q. MAPS A2059a1. O, Apertural; P, ventral; Q, left lateral. S–U. Paratype, AMNH 50542. S, Right lateral; T, ventral; U, left lateral. V–Y. AMNH 47283. V, Right lateral; W, apertural; X, ventral; Y, left lateral. R. Discoscaphites iris (Conrad, 1858), MAPS A2060c1, same loc. as A–Q, S–Y, left lateral. All figures ×1.
Geographic and temporal morphological stasis in the latest Cretaceous ammonoid Discoscaphites iris from the U.S. Gulf and Atlantic Coastal Plains
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