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5 results for “Sclerasterias”
FIGURE 5 in A new genus and species of Goniasteridae, Peedeeaster sandersoni, and the first occurrence of Sclerasterias (Asteriidae) from the Cretaceous Peedee Formation of North Carolina
FIGURE 5. Comparison of Peedeeaster sandersoni n. gen., n. sp. with enlarged pre-terminal superomarginals in fossil taxa. A. USNM PAL 618275 abactinal. Scale Bar=5.0 mm. B. Closeup showing enlarged superomarginal plates. Scale Bar=3.0 mm. C. USNM PAL 772335, Metopaster parkinsoni, abactinal. Scale Bar=3.0 mm. D. same. armtip. Scale Bar=3.0 mm.
FIGURE 4 in A new genus and species of Goniasteridae, Peedeeaster sandersoni, and the first occurrence of Sclerasterias (Asteriidae) from the Cretaceous Peedee Formation of North Carolina
FIGURE 4. Comparison of Peedeeaster sandersoni n. gen., n. sp. with enlarged pre-terminal superomarginals in living taxa. A. Abactinal, USNM PAL 618276. Scale Bar=10.0 mm. B. Closeup of enlarged pre-terminal superomarginals. Scale Bar=5.0 mm. C. Plinthaster lenaigae Mah 2018, Holotype IE-2013-7003. Scale Bar=5.0 mm. D. Armtip showing enlarged preterminal superomarginal plates. Scale bar=5.0 mm. E. Sphaeriodiscus mirabilis A.M. Clark 1976, USNM 1116242, Abactinal surface. Scale Bar=5.0 mm. F. Closeup of pre-terminal superomarginal plates. Scale Bar=5.0 mm.
FIGURE 1 in A new genus and species of Goniasteridae, Peedeeaster sandersoni, and the first occurrence of Sclerasterias (Asteriidae) from the Cretaceous Peedee Formation of North Carolina
FIGURE 1. Sclerasterias sp. USNM PAL 618279. Fossil material figured unless otherwise noted. A. Armtip fragment showing transverse ribs and carinal series. Scale bar=2.0 mm. B. Sclerasterias contorta, USNM E12922 Armtip. Abactinal view showing transverse ribs along carinal series. Scale bar=1.0 mm. C. Abactinal view of arm fragment showing carinal and transverse ribs. D. Sclerasterias contorta USNM E12922 Abactinal view of arm fragment showing carinal and transverse ribs. E. Sclerasterias contorta USNM E34058 showing superomarginal and inferomarginal plates. F. Superomarginal, inferomarginal and adambulacral plates. Abbreviations: Ad= Adambulacral plate, CAR=Carinal plate, CAR-SP=Carinal spine, Pap=papular space, Trv=Transverse rib, SM=Superomarginal plate. IM sp.=Inferomarginal spine, SM sp.=Superomarginal spine.
FIGURE 3. Peedeeaster sandersoni n. gen, n in A new genus and species of Goniasteridae, Peedeeaster sandersoni, and the first occurrence of Sclerasterias (Asteriidae) from the Cretaceous Peedee Formation of North Carolina
FIGURE 3. Peedeeaster sandersoni n. gen, n. sp. A. USNM PAL 618274 holotype. Abactinal surface. Scale Bar=5.0 mm. B. Closeup abactinal surface, pre-terminal superomarginal plates. Scale Bar=2.5 mm. C. Columnar-hourglass abactinal plates from USNM 618274. Top-side view (right) scale=1.0 mm and USNM 618275 side view, abactinal, top side (left) scale=0.5 mm. D. Superomarginal plates from interradius showing granular cover. Scale= 2.5 mm. E. Lateral view, inferomarginal plates. Scale Bar=3.0 mm. F. Furrow spines, actinal details. Scale Bar=5.0 mm. G. USNM PAL 618275, paratype. Closeup of actinal surface showing adambulacral plates and other details. Scale Bar=2.0 mm. H. Actual surface. Scale Bar= 3.0 mm.
FIGURE 2 in A new genus and species of Goniasteridae, Peedeeaster sandersoni, and the first occurrence of Sclerasterias (Asteriidae) from the Cretaceous Peedee Formation of North Carolina
FIGURE 2. Sclerasterias sp. USNM PAL 618279. Fossil material figured unless otherwise noted. Scale bar=2.0 mm. A. Superomarginal and inferomarginal spines, adambulacral plates. B. Sclerasterias contorta, USNM E 34058 showing tube foot groove, ambulacral plates,, adambulacral plates, inferomarginals and superomarginals. C. Actinal view showing adambulacral plates, inferomarginal spines and adjacent plates. D. Cross section showing ambulacrals, marginals and adambulacrals. Arrow pointing to the right in the lower right corner indicating abactinal direction. Abbreviations: Admb= Adambulacral plates, Ad sp=Adambulacral spines, Fur=furrow spine, IM plate=Inferomarginal plate, IM sp=Inferomarginal spine, TF groove=tube foot groove, Trv=Transverse rib.
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