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24 results for “Porphyrocrinus”
FIGURE 9. Porphyrocrinus daniellalevyae n in Porphyrocrinus daniellalevyae n. sp. (Echinodermata: Crinoidea), a sea lily from the tropical western Atlantic with a unique crown pattern
FIGURE 9. Porphyrocrinus daniellalevyae n. sp. paratype (USNM 1411124). A. Oral (upper) view of basal ring with central plug. Dots indicate (estimated) positions of sutures between adjacent basals. Schematic insert indicates basal sutures and number of nerve canal openings within each ossicle; not including canals formed by diverging grooves of adjacent basals that appear along basal sutures. B. Lateral view of proximal crown; radials are lowermost ossicles. C. Aboral view of radial ring showing proximal (aboral) facets of 14 radials. Scale bars: A, C= 1 mm.
FIGURE 16. Porphyrocrinus daniellalevyae n in Porphyrocrinus daniellalevyae n. sp. (Echinodermata: Crinoidea), a sea lily from the tropical western Atlantic with a unique crown pattern
FIGURE 16. Porphyrocrinus daniellalevyae n. sp. paratype (USNM 1411124). Muscular synarthries. A. IBr5 (with IBr6, widest proximal brachial) distal facet. B. IBr9 distal facet. C. Free middle brachial, proximal facet. D. Close-up of lower fossae of C; muscle fossa with coarser stereom above; inner ligament fossa with finer stereom below. Scale bars: A, B 200 µm; B 500 µm; D 100 µm.
FIGURE 13. Porphyrocrinus daniellalevyae n in Porphyrocrinus daniellalevyae n. sp. (Echinodermata: Crinoidea), a sea lily from the tropical western Atlantic with a unique crown pattern
FIGURE 13. Porphyrocrinus daniellalevyae n. sp. paratype (USNM 1411124). Radial ossicles; stereom. A. Aboral ligament fossa. B. Aboral ligament fossa pit. C. Inner ligament fossa pit. D. Muscle fossa. cc = central canal; ilap = inner ligament aboral pit; lp = ligament pit; mf = muscle fossa. Scales: A, C, D 100 µm; B. 50 µm.
FIGURE 15. Porphyrocrinus daniellalevyae n in Porphyrocrinus daniellalevyae n. sp. (Echinodermata: Crinoidea), a sea lily from the tropical western Atlantic with a unique crown pattern
FIGURE 15. Porphyrocrinus daniellalevyae n. sp. paratype (USNM 1411124); trifascial synarthries on proximal (A–B) and middle (C–D) brachials in end view; distal brachials (E–F) in oblique lateral view. A. Distal articular facet of IBr3 with inverted Y-shaped fulcral ridge. B. Corresponding proximal articular facet of succeeding IBr4 with adambulacral leg of fulcral ridge flattened. C, E. Distal articular facets with well-developed inverted Y-shaped fulcral ridge. D, F. Corresponding proximal articular facets of succeeding brachial with adambulacral leg of fulcral ridge excavated, and each leg of Λ-shaped portion split. Scale bars: 500 µm, (upper) A–D, (lower) E–F.
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