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587 results for “Asteroid”
FIG. 13 in The type specimens of extant asteroids (Echinodermata) in the Muséum national d'Histoire naturelle of Paris
FIG. 13. — Stellasteropsis fouadi Dollfus, 1936: A, abactinal; B, actinal surfaces of the lectotype; MNHN-IE-2014-49. Scale bar: 10 mm.
FIG. 9 in The type specimens of extant asteroids (Echinodermata) in the Muséum national d'Histoire naturelle of Paris
FIG. 9. — Persephonaster coelochilus Alcock, 1893: A, actinal surface; B, profile view and C, abactinal surface of the syntype; MNHN-IE-2014-115. Scale bar: 50 mm.
FIG. 4 in The type specimens of extant asteroids (Echinodermata) in the Muséum national d'Histoire naturelle of Paris
FIG. 4. — Zoroaster barathri Alcock, 1893: A, abactinal; B, actinal surfaces of the syntype; MNHN-IE-2014-413. Scale bar: 10 mm.
FIG. 11 in The type specimens of extant asteroids (Echinodermata) in the Muséum national d'Histoire naturelle of Paris
FIG. 11. — Persephonaster croceus Wood-Mason & Alcock, 1891: A, abactinal; B, actinal surfaces of the syntype; MNHN-IE-2014-432. Scale bar: 20 mm.
FIG. 10 in The type specimens of extant asteroids (Echinodermata) in the Muséum national d'Histoire naturelle of Paris
FIG. 10. — Culcita coriacea Müller & Troschel, 1842: A, abactinal; B, actinal surfaces of the syntype; MNHN-IE-2014-461. Scale bar: 50 mm.
FIG. 3 in The type specimens of extant asteroids (Echinodermata) in the Muséum national d'Histoire naturelle of Paris
FIG. 3. — Pentaceros alveolatus Perrier, 1875: A, abactinal; B, actinal surface of a syntype; MNHN-IE-2014-479. Scale bar: 50 mm.
FIG. 2 in The type specimens of extant asteroids (Echinodermata) in the Muséum national d'Histoire naturelle of Paris
FIG. 2. — Astropecten alatus Perrier, 1875: A, abactinal; B, actinal surfaces of the holotype; MNHN-IE-2014-4. Scale bar: 20 mm.
FIG. 7 in The type specimens of extant asteroids (Echinodermata) in the Muséum national d'Histoire naturelle of Paris
FIG. 7. — Stolasterias candicans Ludwig, 1803: A, abactinal; B, actinal surfaces of the syntype; MNHN-IE-2014-447. Scale bar: 20 mm.
FIG. 6 in The type specimens of extant asteroids (Echinodermata) in the Muséum national d'Histoire naturelle of Paris
FIG. 6. — Asteriscus calcaratus Perrier, 1869: A, abactinal; B, actinal surfaces of the holotype; MNHN-IE-2014-443. Scale bar: 10 mm.
FIG. 29 in The type specimens of extant asteroids (Echinodermata) in the Muséum national d'Histoire naturelle of Paris
FIG. 29. — Zoroaster sigsbeei Perrier, 1881: A, abactinal surface; B, profile view of a syntype; MNHN-IE-2014-282. Scale bar: 10 mm.
FIG. 12. Asterina frigida Koehler, 1917 in The type specimens of extant asteroids (Echinodermata) in the Muséum national d'Histoire naturelle of Paris
FIG. 12. Asterina frigida Koehler, 1917: A, abactinal; B, actinal surfaces of syntypes; MNHN-IE-2014-269. Scale bar: 10 mm.
The Eurybates family of the Jupiter Trojan asteroids: members, orbital and spectral properties
<p>This dataset contains identified members of the Eurybates family, a collisional family of the Jupiter Trojans.</p> <p>The members were identified in Marschall et al 2022 (Implications for the collisional strength of Jupiter Trojans from the Eurybates family) using the hierarchical clustering method (HCM).</p> <p>Two tables presented in the accepted manuscript are available here in machine-readable form.</p> <p><strong>Table 3.</strong> List of all 400 Eurybates family members identified by the hierarchical clustering method (HCM) including the likely interloper (5258) Rhoeo (see discussion in Sec. 2). The table gives the asteroid number (nr.), the provisional designation (prov. des.), the absolute magnitude (H), the diameter (D), as well as the proper semi-major axis (a_prop), eccentricity (e_prop), and inclination (i_prop).</p> <p><strong>Tabel 4. </strong>Color data for Eurybates family members identified by the hierarchical clustering method (HCM) including the likely interloper (5258). The table gives the asteroid number (nr.), the provisional designation (prov. des.), the absolute magnitude (H), the diameter (D), as well as the g-i color from the Sloan Digital Sky Survey, the spectral slopes between 0.3$ to 0.9 \mu m (S), and the g-r color from the Zwicky Transient Facility Observations, ZTF.</p> <p> </p>
Fig. 10 in A new zoroasterid asteroid from the Eocene of Seymour Island, Antarctica
Fig. 10. Most parsimonious (A) and consensus (B) tree from the Zoroasteridae. Bootstrap values are in boldface below and Jackknife values are shown in italics to the left above the node numbers in the cladogram.
Fig. 9 in A new zoroasterid asteroid from the Eocene of Seymour Island, Antarctica
Fig. 9. Zoroasterid asteroid Zoroaster marambioensis sp. nov., Eocene, Cucullaea I Allomember, La Meseta Formation of Seymour Island, Antarctica. Volume rendering captions from microCT (SOM 2). A. IAA-Pi-373-E; general actinal surface reconstruction (A1); detailed arm structure on actinal side A2), see primary and secondary spines preserved in detail and last ossicles of 4th actinolateral row (arrows). general abactinal surface reconstruction (A3) transverse view of disc structures, see orals and oral spines on disc center (A4). B. IAA-Pi-373-D, general reconstructions of abactinal (B1) and actinal B2) surfaces. C. IAA-Pi-373-G; reconstructions of abactinal (C1) and actinal (C2) surfaces; structure detail on inclined side of arm (C3); transverse section of a ray (C4).
Fig. 7 in A new zoroasterid asteroid from the Eocene of Seymour Island, Antarctica
Fig. 7. Diagrams of plate arrangement on disc and arms of zoroasterid asteroid Zoroaster marambioensis sp. nov., Eocene, Cucullaea I Allomember, La Meseta Formation of Seymour Island, Antarctica. Note the presence of a single row of marginal ossicles. A. IAA-Pi-373-B, abactinal view of disc. B. IAA-Pi-373-H, transverse section of arm. C. IAA-Pi-373-Q1, transverse section of a partially deformed ray. D. Shape and arrangement of all the ossicle rows of an arm, projected on a plane. D not to scale.
Fig. 8 in A new zoroasterid asteroid from the Eocene of Seymour Island, Antarctica
Fig. 8. Zoroasterid asteroid Zoroaster marambioensis sp. nov., Eocene, Cucullaea I Allomember, La Meseta Formation of Seymour Island, Antarctica. A. IAA-Pi-373-N, arm tip, detailed abactinal (A1) and actinal (A2) views of distal and terminal ossicles; detailed stereom structure of terminal ossicle in abactinal (A3) and actinal (A4) surface, note that the fossil was preserved in life poisition, then the stereom in abactinal surface was unaltered. B. IAA- Pi-373-G; position and arrangement of primary and secondary spines and pedicellariae in actinal inclined side of arm (B1); lateral view of arm, showing spines and pedicellariae associated to actinolaterals (B2). Abbreviations: 1Sp, primary spine; 2Sp, secondary spine.
Fig. 6 in A new zoroasterid asteroid from the Eocene of Seymour Island, Antarctica
Fig. 6. Zoroasterid asteroid Zoroaster marambioensis sp. nov., Eocene, Cucullaea I Allomember, La Meseta Formation of Seymour Island, Antarctica. A. IAA-Pi-373-K, abactinal (A1) and actinal (A2) views of a regenerating arm tip, note the size differences between ossicles and terminal small and inconspicuous. B. IAA-Pi-373-N, abactinal (B1) and actinal (B2) views of arm tip. C. IAA-Pi-373-L, regenerating arm tip on abactinal (C1) and actinal (C2) views, note small ossicles in chaotic arrangement on abactinal side. D. IAA-Pi-373-Q1, transverse section of a partially deformed ray. E. IAA-Pi- 373-Q4, actinal view of a ray on the second third section, note that the third row of actinolaterals is reduced towards the arm tip (arrows). F. IAA-Pi-373-E, close-up of popular pore with small pedicellariae basal plate (arrow). G. IAA-Pi-373-E, small pedicellariae blades (arrow) on associated to a non-carinate adambulacral (arrow). H. IAA-Pi-373-R, inclined views of arms in life position; furrow with two big and three small pedicellariae (arrows) (H1); arm with three big pedicellariae (arrows) (H2).
Fig. 5 in A new zoroasterid asteroid from the Eocene of Seymour Island, Antarctica
Fig. 5. Zoroasterid asteroid Zoroaster marambioensis sp. nov., Eocene, Cucullaea I Allomember, La Meseta Formation of Seymour Island, Antarctica. A. IAA-Pi-373-B, actinal (A1) and abactinal (A2) views. Gastropod valve near peristome location, partially attached to orals in actinal side (arrow). B. IAA-Pi-373-M, actinal view, showing oral depression, inferred position of actinostome and orals. C. IAA-Pi-373-E, detail of arm structures; abactinal view, indicating ossicle rows (C1); lateral view of distal, denuded part of the arm (C2), note the insertion marks left by primary and secondary spines on marginals and actinolaterals (arrows); lateral view of proximal part of arm, primary and secondary spine number and arrangement (C3); carinal ossicle structure and position of papular orifices (C4). D. IAA-Pi-373-I, interbrachial zone of disc on abactinal view, modified triangular marginals (arrows). E. IAA-Pi-373-C; position of madreporic plate on fragmented disc (E1); detailed structure of madreporite (arrow) (E2). Abbreviations: Adr, adradial; Al, actinolateral; C, carinal; Ct, central; Ird, interradial; M, marginal; R, radial.
Fig. 4 in A new zoroasterid asteroid from the Eocene of Seymour Island, Antarctica
Fig. 4. Zoroasterid asteroid Zoroaster marambioensis sp. nov., Eocene, Cucullaea I Allomember, La Meseta Formation of Seymour Island, Antarctica. A. IAA-Pi-373-A, general view of abactinal surface. B–H. General appearance of each fragment in abactinal (B1–H1) and actinal (B2–H2) views. B. IAA- Pi-373-B. C. IAA-Pi-373-C. D. IAA-Pi-373-D. E. IAA-Pi-373-E. F. IAA-Pi-373-F. G. IAA-Pi-373-G. H. IAA-Pi-373-H.
Fig. 3 in A new zoroasterid asteroid from the Eocene of Seymour Island, Antarctica
Fig. 3. Overview of asteroid layer in the type locality, GPS POI 64°14'24" S, 56°40'02" W, Cucullaea I Allomember, La Meseta Formation (Eocene). Seymour Island, Antarctica. Arrows indicate asteroid fragments.
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