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1,929 results for “ARMS”
FIGURE 2 in Sometimes two arms are enough—an unusual life-stage in brittle stars (Echinodermata: Ophiuroidea)
FIGURE 2. Morphology of Amphiura ungulata, juveniles. (A) elongated dorsal disc, lacking primary plates, (B) dorsal arm, (C) ventral overview, (D) oral frame and pattern of arms, note the terminal plates of three undeveloped arms marked by arrows, (E) ventral arm, (F) hoof-shaped spines, (G) specimen with possible madreporite, (H–J) the three underdeveloped arms are growing in larger juveniles. M, madreporite, TP, terminal plate. Scale bars in millimetre. SEM images except O, P.
FIGURE 25 in Lateral arm plate morphology in brittle stars (Echinodermata: Ophiuroidea): new perspectives for ophiuroid micropalaeontology and classification
FIGURE 25. Lateral arm plates (LAPs) in external (a) and internal (b) views. Ophioplinthus brevirima, 1: proximal LAPs; 2: median LAPs; 3: distal LAPs. Ophioplinthus gelida, 4: proximal LAPs; 5: median LAPs; 6: distal LAPs. Ophioplinthus martensi, 7: proximal LAPs; 8: median LAPs; 9: distal LAPs.
FIGURE 18 in Lateral arm plate morphology in brittle stars (Echinodermata: Ophiuroidea): new perspectives for ophiuroid micropalaeontology and classification
FIGURE 18. Lateral arm plates (LAPs) in external (a) and internal (b) views. Ophiopleura borealis, 1: proximal LAPs; 2: median LAPs; 3: distal LAPs. Ophiura albida, 4: proximal LAPs; 5: median LAPs; 6: distal LAPs. Ophiura ophiura, 7: proximal LAPs; 8: median LAPs; 9: distal LAPs.
FIGURE 17 in Lateral arm plate morphology in brittle stars (Echinodermata: Ophiuroidea): new perspectives for ophiuroid micropalaeontology and classification
FIGURE 17. Lateral arm plates (LAPs) in external (a) and internal (b) views. Ophionotus hexactis, 1: proximal LAPs; 2: median LAPs; 3: distal LAPs. Ophionotus victoriae, 4: proximal LAPs; 5: median LAPs; 6: distal LAPs. Ophiosparte gigas, 7: proximal LAPs; 8: median LAPs; 9: distal LAPs.
FIGURE 14 in Lateral arm plate morphology in brittle stars (Echinodermata: Ophiuroidea): new perspectives for ophiuroid micropalaeontology and classification
FIGURE 14. Lateral arm plates (LAPs) in external (a) and internal (b) views. Ophiactis abyssicola, 1: proximal LAPs; 2: median LAPs; 3: distal LAPs. Ophiactis asperula, 4: proximal LAPs; 5: median LAPs; 6: distal LAPs. Ophiactis balli, 7: proximal LAPs; 8: median LAPs; 9: distal LAPs.
FIGURE 13 in Lateral arm plate morphology in brittle stars (Echinodermata: Ophiuroidea): new perspectives for ophiuroid micropalaeontology and classification
FIGURE 13. Lateral arm plates (LAPs) in external (a) and internal (b) views. Ophiopholis aculeata, 1: proximal LAPs; 2: median LAPs; 3: distal LAPs. Ophiothrix fragilis, 4: proximal LAPs; 5: median LAPs; 6: distal LAPs. Ophiothrix rudis, 7: proximal LAPs; 8: median LAPs; 9: distal LAPs.
FIGURE 16 in Lateral arm plate morphology in brittle stars (Echinodermata: Ophiuroidea): new perspectives for ophiuroid micropalaeontology and classification
FIGURE 16. Lateral arm plates (LAPs) in external (a) and internal (b) views. Ophiura robusta, 1: proximal LAPs; 2: median LAPs; 3: distal LAPs. Stegophiura nodosa, 4: proximal LAPs; 5: median LAPs; 6: distal LAPs. Ophiura ljungmani, 7: proximal LAPs; 8: median LAPs; 9: distal LAPs.
FIGURE 10 in Lateral arm plate morphology in brittle stars (Echinodermata: Ophiuroidea): new perspectives for ophiuroid micropalaeontology and classification
FIGURE 10. Lateral arm plates (LAPs) in external (a) and internal (b) views. Ophiacantha anomala, 1: proximal LAPs; 2: median LAPs; 3: distal LAPs. Ophiacantha vivipara, 4: proximal LAPs; 5: median LAPs; 6: distal LAPs. Ophiocomina nigra, 7: proximal LAPs; 8: median LAPs; 9: distal LAPs.
FIGURE 12 in Lateral arm plate morphology in brittle stars (Echinodermata: Ophiuroidea): new perspectives for ophiuroid micropalaeontology and classification
FIGURE 12. Lateral arm plates (LAPs) in external (a) and internal (b) views. Amphiura chiajei, 1: proximal LAPs; 2: median LAPs; 3: distal LAPs. Amphiura filiformis, 4: proximal LAPs; 5: median LAPs; 6: distal LAPs. Amphiura sundevalli, 7: proximal LAPs; 8: median LAPs; 9: distal LAPs.
FIGURE 8 in Lateral arm plate morphology in brittle stars (Echinodermata: Ophiuroidea): new perspectives for ophiuroid micropalaeontology and classification
FIGURE 8. Lateral arm plates (LAPs) in external (a) and internal (b) views. Ophiomitra leucorhabdota, 1: proximal LAPs; 2: median LAPs. Ophiomitrella clavigera, 3: proximal LAPs; 4: median LAPs; 5: distal LAPs. Ophioplinthaca plicata, 6: proximal LAPs; 7: median LAPs.
FIGURE 9 in Lateral arm plate morphology in brittle stars (Echinodermata: Ophiuroidea): new perspectives for ophiuroid micropalaeontology and classification
FIGURE 9. Lateral arm plates (LAPs) in external (a) and internal (b) views. Ophiacantha placida, 1: proximal LAPs; 2: median LAPs. Ophiacantha antarctica, 3: proximal LAPs; 4: median LAPs; 5: distal LAPs. Ophiacantha bidentata, 6: proximal LAPs; 7: median LAPs; 8: distal LAPs.
FIGURE 6 in Lateral arm plate morphology in brittle stars (Echinodermata: Ophiuroidea): new perspectives for ophiuroid micropalaeontology and classification
FIGURE 6. Lateral arm plates (LAPs) in external (a) and internal (b) views of one adult specimen of Ophiura sarsii from Toyama Bay, Japan, and three different growth stages of Ophiura sarsii from off Iceland. 1–2: proximal (1) and median (2) LAPs of adult specimen from Japan; 3–4: proximal (3) and median (4) LAPs of adult specimen from off Iceland, dd=12,5 mm; 5–6: proximal (5) and median (6) LAPs of juvenile specimen from off Iceland, dd=7,8 mm; 7–8: proximal (7) and median (8) LAPs of juvenile specimen from off Iceland, dd=2,5 mm. dd: disc diameter.
FIGURE 24 in Lateral arm plate morphology in brittle stars (Echinodermata: Ophiuroidea): new perspectives for ophiuroid micropalaeontology and classification
FIGURE 24. Lateral arm plates (LAPs) in external (a) and internal (b) views. Ophiochiton fastigatus, 1: proximal LAPs; 2: median LAPs; 3: distal LAPs. Ophioplocus imbricatus, 4: proximal LAPs; 5: median LAPs; 6: distal LAPs. Ophiomusium lymani, 7: proximal LAPs; 8: median LAPs; 9: distal LAPs.
FIGURE 21 in Lateral arm plate morphology in brittle stars (Echinodermata: Ophiuroidea): new perspectives for ophiuroid micropalaeontology and classification
FIGURE 21. Lateral arm plates (LAPs) in external (a) and internal (b) views, with detail of tubercles on outer surface (c). Ophiolepis cincta, 1: proximal LAPs; 2: median LAPs; 3: distal LAPs. Ophiolepis elegans, 4: proximal LAPs; 5: median LAPs; 6: distal LAPs. Ophiolepis variegata, 7: proximal LAPs; 8: median LAPs; 9: distal LAPs. Scale bars for 1c, 4c and 7c equal 100 µm.
FIGURE 5 in Lateral arm plate morphology in brittle stars (Echinodermata: Ophiuroidea): new perspectives for ophiuroid micropalaeontology and classification
FIGURE 5. Lateral arm plates (LAPs) in external (a) and internal (b) views of three different growth stages of Ophiacantha fraterna. 1–3: proximal (1), median (2) and distal (3) LAPs of adult specimen, dd=7,6 mm; 4–6: proximal (4), median (5) and distal (6) LAPs of juvenile specimen, dd=5,1 mm; 7–9: proximal (7), median (8) and distal (9) LAPs of juvenile specimen, dd=3,8mm. dd: disc diameter.
FIGURE 11 in Lateral arm plate morphology in brittle stars (Echinodermata: Ophiuroidea): new perspectives for ophiuroid micropalaeontology and classification
FIGURE 11. Lateral arm plates (LAPs) in external (a) and internal (b) views. Ophiocoma erinaceus, 1: proximal LAPs; 2: median LAPs; 3: distal LAPs. Ophiocoma scolopendrina, 4: proximal LAPs; 5: median LAPs; 6: distal LAPs. Amphiura belgicae, 7: proximal LAPs; 8: median LAPs; 9: distal LAPs.
FIGURE 3 in Lateral arm plate morphology in brittle stars (Echinodermata: Ophiuroidea): new perspectives for ophiuroid micropalaeontology and classification
FIGURE 3. Height:width ratio of proximal lateral arm plates (extracted from 10th segment counted from first real arm segment incorporated into the disk) of Ophiacantha bidentata plotted against disc diameter.
FIGURE 2 in Lateral arm plate morphology in brittle stars (Echinodermata: Ophiuroidea): new perspectives for ophiuroid micropalaeontology and classification
FIGURE 2. Proximal lateral arm plates in external (a) and internal (b) views of eight adult, similarly sized specimens of Ophiacantha bidentata, each from the tenth arm segment. 1: dd=9.8 mm; 2: dd=12.7 mm; 3: dd=10.4 mm; 4: dd=10.2 mm; 5: dd=9.7 mm; 6: dd=10.2 mm; 7: dd=12 mm; 8: dd=12 mm. Scale bar equals 1 mm; dd: disc diameter.
FIGURE 1 in Lateral arm plate morphology in brittle stars (Echinodermata: Ophiuroidea): new perspectives for ophiuroid micropalaeontology and classification
FIGURE 1. Proximal lateral arm plates of Ophioderma appressa in external (left) and internal (right) views to show the orientations (d: dorsal, dp: dorso-proximal, p: proximal, vp: ventro-proximal, v: ventral, vdi: ventro-distal, di: distal, ddi: dorso-distal) and characters (K: knob on inner side, P: perforation on inner side, R: ridge on inner side, SA: spine articulations, SP: spurs on outer proximal and inner distal edges, TN: tentacle notch) used in this study.
FIGURE 7 in Lateral arm plate morphology in brittle stars (Echinodermata: Ophiuroidea): new perspectives for ophiuroid micropalaeontology and classification
FIGURE 7. Lateral arm plates (LAPs) in external (a) and internal (b) views. Ophiolimna bairdi, 1: proximal LAPs; 2: median LAPs; 3: distal LAPs. Ophiacantha abyssicola, 4: proximal LAPs; 5: median LAPs; 6: distal LAPs. Ophiacantha setosa, 7: proximal LAPs; 8: median LAPs; 9: distal LAPs.
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