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105 results for “ophiuroids”
Fig. 1 in Pyritized tube feet in a protasterid ophiuroid from the Upper Ordovician of Kentucky, U.S.A.
Fig. 1. Protasterina flexuosa (Miller and Dyer, 1878), Edenian (Upper Ordovician) near Covington, Kentucky. Specimen with pyritized tube feet, CMC 25001. A. Fragmented specimen originally figured by Ulrich (1878), ventral, photographed on sand for support. B. Disk, and proximal portions of arms, small disk spines are visible along edges. C. Mouth frame, note depressions on mouth angle plates, and preserved buccal tentacles (arrows); possible remains of small spines visible on abradial edge of one of the mouth angle plates (circle). D. Madreporite. E. Two podial basins with remnants of pyritized tube feet. F. Ventral surface of ambulacrals and podial basins without pyritized tube feet; proximal ends of groove spines preserved, laterals attach to ambulacrals via an elongated process. G. Dorsal surface of ambulacrals with large interambulacral muscle gaps. H. Section of arm bearing numerous remnants of tube feet; note groove spines on laterals.
Data from: Dark ophiuroid biodiversity in a prospective abyssal mine field
The seafloor contains valuable mineral resources, including polymetallic (or manganese) nodules that form on offshore abyssal plains. The largest and most commercially attractive deposits are located in the Clarion Clipperton Fracture Zone (CCZ), in the eastern Pacific Ocean (EP) between Hawaii and Mexico, where testing of a mineral collection system is set to start soon [1]. The requirement to establish pre-mining environmental management plans has prompted numerous recent biodiversity and DNA barcoding surveys across these remote regions. Here we map DNA sequences from sampled ophiuroids (brittle-stars, including post-larvae) of the CCZ and Peru Basin onto a substantial tree-of-life to show unprecedented levels of abyssal ophiuroid phylogenetic diversity including at least three ancient (>70 my), previously unknown clades. While substantial dark (unobserved) biodiversity has been reported from various microbial meta-barcoding projects [2, 3], our data shows that we have considerably under-estimated the biodiversity of even the most conspicuous mega-faunal invertebrates [4] of the EP abyssal plain.
Data from: A Silurian ophiuroid with soft tissue preservation
<p>Palaeozoic brittle stars are not equipped with the fused arm ossicles (vertebrae) that facilitate the remarkable mode of walking that characterizes living forms. Here we describe a stem ophiuroid from the Herefordshire Lagerstätte (Silurian, Wenlock Series) which is remarkable in preserving the body cavity uncompacted and long tube feet which lack suckers. We tentatively assign the specimen to Protaster. The morphology of the arms and attitude of the specimen suggest that locomotion was achieved by arm propulsion combined with podial walking. The ophiuroid was also capable of different types of feeding strategies. This protasterid ophiuroid increases the diversity of echinoderm higher taxa with preserved soft parts represented in the Herefordshire Lagerstätte.</p>
Global benthic biogeographical regions and macroecological drivers for ophiuroids
<p>Data and codes for the publication <strong>Global benthic biogeographical regions and macroecological drivers for ophiuroids</strong></p>
Data from: Dark ophiuroid biodiversity in a prospective abyssal mine field
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Data from: A Silurian ophiuroid with soft tissue preservation
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FIG. 2. Shallow-water ophiuroids from Peru. A in Revisiting the diversity and distribution of the ophiuroids (Echinodermata Ophiuroidea) from Peru
FIG. 2. Shallow-water ophiuroids from Peru. A, Ophioderma panamense, Isla Foca; B, Ophiocoma aethiops, El Ñuro; C, Ophiolepis crassa, Isla Foca; D, Ophiactis kroeyeri, Melchorita; E, Ophioderma peruanum, El Ñuro; F, Ophionereis annulata, Cancas (field photographs; sizes not recorded; specimens not collected)
FIG. 1 in Revisiting the diversity and distribution of the ophiuroids (Echinodermata Ophiuroidea) from Peru
FIG. 1. Sample-based rarefaction curve of the Ophiuroidea from Peru according to the number of localities. Solid line: observed richness, Dashed line: expected average richness, Dotted lines: confidence interval (±95%)
FIGURE 3 in Ophiuroids (Echinodermata; Ophiuroidea) of biogenic habitats on the continental shelf of New Zealand
FIGURE 3. Two morphological variations of Astroceras elegans (Bell 1917) (NIWA, TAN0906/154) showing live colour. a: two specimens in situ on host plexaurid coral, scale bar = 1 cm, b: morph 1 cf. A. maui McKnight, 1968 (NIWA 56500), c: morph 2 (NIWA 56499, TAN0906/154).
FIGURE 2. a in Ophiuroids (Echinodermata; Ophiuroidea) of biogenic habitats on the continental shelf of New Zealand
FIGURE 2. a: Asteroporpa (Asteroporpa) australiensis Clark, 1909 on host primnoid coral (NIWA 56911, TAN0906/170), scale bar = 3 mm, and b: Astrobrachion constrictum (Farquhar, 1900) on host black coral (NIWA 56330, TAN0906/146), scale bar = 10 mm.
FIGURE 6 in Ophiuroids (Echinodermata; Ophiuroidea) of biogenic habitats on the continental shelf of New Zealand
FIGURE 6. Ophiocentrus novaezelandiae Gislén, 1926 (morph 1, NIWA 57322, TAN0906/232) showing live colour, a: dorsal, b: ventral, scale bar = 5 mm.
FIGURE 5 in Ophiuroids (Echinodermata; Ophiuroidea) of biogenic habitats on the continental shelf of New Zealand
FIGURE 5. Amphiura (Amphiura) correcta Koehler, 1907 (NIWA 55075, TAN0906/50) showing live colour and morphological features. A: dorsal side of whole animal, scale bar = 5 mm, b: close-up of ventral side with labels indicating sharp hyaline-tipped arm spines (as), widened distal oral papillae (dop), naked ventral disc (vd) and paired tentacle scales (ts)., c: close-up of fully scaled dorsal disc.
FIGURE 14 in Ophiuroids (Echinodermata; Ophiuroidea) of biogenic habitats on the continental shelf of New Zealand
FIGURE 14. Ophiothrix (Acanthophiothrix) lepidus de Loriol, 1893 (NIWA 72990, TAN1105/9) showing preserved colour, a: whole animal, scale bar = 10 mm and close up views of a second specimen b: dorsal disc, c: ventral disc, scale bar = 5 mm.
FIGURE 10 in Ophiuroids (Echinodermata; Ophiuroidea) of biogenic habitats on the continental shelf of New Zealand
FIGURE 10. Ophiopsammus maculata (Verrill, 1869) (NIWA 74360, TAN1108/66, a: whole animal, b: dorsal, c: ventral) and Ophiopsammus assimilis (Bell, 1888) (NIWA 55232, TAN0906/68, d: whole animal, e: dorsal, f: ventral, showing live colour. Scale bars = 1 cm.
FIGURE 17. Ophiozonoida picta H. L. Clark, 1915 in Ophiuroids (Echinodermata; Ophiuroidea) of biogenic habitats on the continental shelf of New Zealand
FIGURE 17. Ophiozonoida picta H. L. Clark, 1915 (NIWA 56113, TAN0906/134) showing live colour, a: dorsal, b: ventral, scale bar = 1 mm.
FIGURE 16 in Ophiuroids (Echinodermata; Ophiuroidea) of biogenic habitats on the continental shelf of New Zealand
FIGURE 16. Ophioplocus marginata (Fell, 1953) (NIWA 74487, TAN1108/77) showing live colour in two individuals, a: ventral, b: dorsal, scale bar = 1 cm.
FIGURE 13. a in Ophiuroids (Echinodermata; Ophiuroidea) of biogenic habitats on the continental shelf of New Zealand
FIGURE 13. a: Ophionereis fasciata Hutton, 1872 (NIWA 74208, TAN1108/39) and b: Ophionereis novaezelandiae Mortensen, 1936 (NIWA 55682, TAN0906/99) showing live colour and patterning on the dorsal side of the animals.
FIGURE 9. Cryptopelta tarltoni Baker, 1974 in Ophiuroids (Echinodermata; Ophiuroidea) of biogenic habitats on the continental shelf of New Zealand
FIGURE 9. Cryptopelta tarltoni Baker, 1974 (NIWA 56234, TAN0906/140) showing live colour, a: dorsal, b: ventral; Scale bar = 5 mm.
FIGURE 12 in Ophiuroids (Echinodermata; Ophiuroidea) of biogenic habitats on the continental shelf of New Zealand
FIGURE 12. Spines from mid-distal arm of Ophiobyrsa intorta (Koehler, 1922) specimen (NIWA 75542, TAN1108/250). The hooked spine is the first ventral arm spine, the rest of the arm spines resemble the spine on the left. Scale bar = 0.2 mm.
FIGURE 11 in Ophiuroids (Echinodermata; Ophiuroidea) of biogenic habitats on the continental shelf of New Zealand
FIGURE 11. Dorsal side of Ophiobyrsa intorta (Koehler, 1922) (NIWA 75542, TAN1108/250) showing live colour. Scale bar = 1 cm.
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OpenNeuro
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