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343 results for “Brittle stars”
Fig. 2 in The oldest representative of a modern deep-sea ophiacanthid brittle-star clade from Jurassic shallow-water coral reef sediments
Fig. 2. Ophiacanthid brittle−star Ophiosternle crinitum (Quenstedt, 1876), from the Reef debris beds within the Mergelstetten Formation (Hybonoticeras beckeri Zone, Lithacoceras ulmense Subzone), latest Kimmeridgian, Late Jurassic of Buchenbrunnen near Steinenfeld, S−Germany. A. GPIT/69/96−24 (holotype). Detail of proximal arm segments in ventral view without arm spines (A1) and with arm spines (A2). B. 96/23 (paratype). Arm fragment in ventral view (B1), proximal arm segments in lateral view (B2). C. GPIT/AS/56 (paratype). Complete specimen (C1) and detail of proximal to median arm segments (C2) in dorsal view.
Fig. 1 in The oldest representative of a modern deep-sea ophiacanthid brittle-star clade from Jurassic shallow-water coral reef sediments
Fig. 1. Ophiacanthid brittle−star Ophiosternle crinitum (Quenstedt, 1876), GPIT/69/96−24 (holotype), from the Reef debris beds within the Mergelstetten Formation (Hybonoticeras beckeri Zone, Lithacoceras ulmense Subzone), latest Kimmeridgian, Late Jurassic of Buchenbrunnen near Steinenfeld, S−Germany. A. Complete specimen in ventral view. B. Detail of dorsal side showing arm base and distal tip of radial shields. C. Detail of disc in dorsal view. D, E. Detail of disc in ventral view; photograph (D) and explanatory drawing (E).
Fig. 2 in A new brittle star from the early Carboniferous of Poland and its implications on Paleozoic modern-type ophiuroid systematics
Fig. 2. Ophiurin brittle star Aganaster jagiellonicus sp. nov. from the upper Tournaisian to lower Visean (lower Carboniferous) Mazurowe Doły Formation, Rudawa Group of Czatkowice quarry, Dębnik Massif, southern Poland; MZUJ T/0282, holotype. A. General view of the specimen, exposing the ventral side (also illustrated by O'Hara et al. 2014). B. Oral skeleton. C. Detail of the oral skeleton; photograph (C1), interpretative drawing (C2). D. Detail of basal arm segments; photograph (D1), interpretative drawing (D2).
Fig. 1 in A new brittle star from the early Carboniferous of Poland and its implications on Paleozoic modern-type ophiuroid systematics
Fig. 1. Geographical position of the investigated specimen (map after Salata 2013, with modifications).
Fig. 3 in A new brittle star from the early Carboniferous of Poland and its implications on Paleozoic modern-type ophiuroid systematics
Fig. 3. Ophiurin brittle star Aganaster jagiellonicus sp. nov. from the upper Tournaisian to lower Visean (lower Carboniferous) Mazurowe Doły Formation, Rudawa Group of Czatkowice quarry, Dębnik Massif, southern Poland; MZUJ T/0282, holotype. Detail of ventral side (A); median arm segments, showing the transition from between-plate tentacle pores to within-plate tentacle pores (B); median arm segments in ventro-lateral view (C); proximal arm segments in dorso-lateral view (D).
Linked collectors and determiners for: A new species of the remarkable brittle star genus Astrophiura (Echinodermata: Ophiuroidea) from the western Atlantic Ocean.
Natural history specimen data linked to collectors and determiners held within, "A new species of the remarkable brittle star genus Astrophiura (Echinodermata: Ophiuroidea) from the western Atlantic Ocean". Claims or attributions were made on Bionomia by volunteer Scribes, <a href="https://bionomia.net/dataset/9dc40601-3490-4a5f-b56e-00ce03fbeaa7">https://bionomia.net/dataset/9dc40601-3490-4a5f-b56e-00ce03fbeaa7</a> using specimen data from the dataset aggregated by the Global Biodiversity Information Facility, <a href="https://gbif.org/dataset/9dc40601-3490-4a5f-b56e-00ce03fbeaa7">https://gbif.org/dataset/9dc40601-3490-4a5f-b56e-00ce03fbeaa7</a>. Formatted as a Frictionless Data package.
Figure 17. Ophiocomina nigra postlarval development. A, B, two 0.7 in Who's who among baby brittle stars (Echinodermata: Ophiuroidea): postmetamorphic development of some North Atlantic forms
Figure 17. Ophiocomina nigra postlarval development. A, B, two 0.7 mm dd postlarva dorsal, note that only one has secondary inter-radial plates (SIR); C, 0.7 mm dd postlarva ventral; D, E, 0.9 mm dd postlarvae; D, dorsal; E, ventral; F–H, 1.4 mm dd postlarvae; F, dorsal; G, arm dorsal; H, ventral; I–K, 1.6 mm dd postlarva; I, jaw, note the scale-like adoral shield spine (ASS) and the second smaller scale proximal to it; J, arm spines, note the serrated edges; K, disc granules are strongly rugose; L, 2.4 mm juvenile; M, 3 mm dd juvenile. Abbreviations: as in Figs 1–3, 10. Scale bars in millimetres.
Figure 16. Ophiothrix fragilis postlarval development. A–C, 0.34 in Who's who among baby brittle stars (Echinodermata: Ophiuroidea): postmetamorphic development of some North Atlantic forms
Figure 16. Ophiothrix fragilis postlarval development. A–C, 0.34 mm dd postlarvae; A, on arm of adult; B, dorsal, note the large central plate (CPP); C, ventral, note the tricuspid tooth; D–G, 0.55 mm dd postlarvae; D, arm dorsal, note the small terminal plate (TP) and large hooks; F, arm lateral; G, ventral; H, I, 0.8 mm dd postlarvae; H, dorsal, radial shields (RS) and inter-radial plates (IR1, 2) have formed; I, ventral; J, K, 1.1 mm postlarvae; J, dorsal, note the k-plate; K, ventral, note the first tooth papillae (TPa); L–N, 1.3 mm postlarvae; L, dorsal with numerous disc spines; M, ventral with additional TPa; N, arm dorsal, note the serrated shape of the proximal dorsal spines. Abbreviations: as in Figs 1–3, 5. Scale bars in millimetres. Some dorsal plates have fallen off due to the bleaching process (H, J).
Figure 13. Amphiura filiformis postlarval development. A, B, 0.35 in Who's who among baby brittle stars (Echinodermata: Ophiuroidea): postmetamorphic development of some North Atlantic forms
Figure 13. Amphiura filiformis postlarval development. A, B, 0.35 mm dd postlarvae; A, dorsal, note the solid plate stereom; B, ventral; C, D, 0.5 mm dd postlarva; C, dorsal, note the multilayered plate margins; D, ventral; E, F, 0.6 mm dd postlarva; E, dorsal; F, ventral, note the infradental papillae (IP = MP1); G, 1 mm dd postlarva arm ventral, note the serrated middle arm spine; H, I, 1.3 mm dd postlarva; H, dorsal; I, ventral; J, K, 1.6 mm dd postlarva; J, dorsal; K, ventral; L, 5 mm dd adult. Abbreviations: as in Figs 1–3, 5. Scale bars in millimetres.
Figure 6 in Who's who among baby brittle stars (Echinodermata: Ophiuroidea): postmetamorphic development of some North Atlantic forms
Figure 6. Ophiomitrella clavigera postlarval development, specimens taken from brooding adult are termed embryo, freeliving stages postlarvae. A–C, 0.6 mm dd embryo; A, dorsal; B, arm ventral; C, jaws; D, 1 mm dd embryo dorsal; E, 1.3 mm dd embryo ventral; F, same, jaws; G, 1.5 mm dd postlarva dorsal; H, same ventral; I, 2.1 mm postlarva dorsal; J, adult ventral; K, adult arm ventral. Abbreviations: T, tooth; others as in Figs 1, 2, 5. Scale bars in millimetres.
Figure 14. Histampica duplicata postlarval development. A, B, 1.5 in Who's who among baby brittle stars (Echinodermata: Ophiuroidea): postmetamorphic development of some North Atlantic forms
Figure 14. Histampica duplicata postlarval development. A, B, 1.5 mm dd postlarva; A, dorsal, note the thicker plate margins; B, ventral; C, D, 2.9 mm dd juvenile; C, dorsal; D, ventral. Abbreviations: as in Figs 1–3, 5. Scale bars in millimetres.
Figure 12. Amphiura chiajei postlarval development. A, B, 0.4 in Who's who among baby brittle stars (Echinodermata: Ophiuroidea): postmetamorphic development of some North Atlantic forms
Figure 12. Amphiura chiajei postlarval development. A, B, 0.4 mm dd postlarvae; A, dorsal, note the large fenestrations of the primary plates; B, ventral; C, D, 0.6 mm dd postlarvae; C, dorsal; D, ventral; E, F, 0.9 mm dd postlarva, E, dorsal, note the inter-radial plates (IR); F, ventral, note the infradental papillae (IP = MP2) on the dental plate (DP); G, H, 1.4 mm dd postlarvae; G, dorsal, note the k-plate (k); H, ventral, the adoral shield spine (ASS) has transformed into a flat scale; I, J, 2.0 mm postlarvae; I, dorsal; J, ventral, IP have moved onto oral plates; K–M, 2.4 mm dd juvenile; K, arm ventral, note the tentacle scales (TS); L, ventral; M, dorsal; N, O, 3 mm dd juvenile; N, dorsal; O, ventral. Abbreviations: as in Figs 1–3, 5. Scale bars in millimetres.
Figure 8. Ophiura albida postlarval development. A, B, 0.4 in Who's who among baby brittle stars (Echinodermata: Ophiuroidea): postmetamorphic development of some North Atlantic forms
Figure 8. Ophiura albida postlarval development. A, B, 0.4 mm dd postlarva; A, dorsal, note the multilayered structure of the disc plates; B, ventral; C, D, 0.5 mm dd postlarva; C, dorsal; D, ventral, note the shape of the first ventral arm plate (VAP1); E, 0.7 mm dd postlarva. Abbreviations: as in Figs 1–2, 5. Scale bars in millimetres.
Figure 9. Ophiura ophiura postlarval development. A, B, 0.3 in Who's who among baby brittle stars (Echinodermata: Ophiuroidea): postmetamorphic development of some North Atlantic forms
Figure 9. Ophiura ophiura postlarval development. A, B, 0.3 mm dd postlarva; A, dorsal, note the flat disc; B, ventral; C, D, 0.5 mm dd postlarva; C, dorsal, note the high disc, madreporite still dorsal; D, ventral; E, F, 0.7 mm dd postlarva; E, dorsal; F, ventral; G, 1.8 mm dd postlarva dorsal, note the domed central plate (CPP); H, 4 mm dd juvenile dorsal, the central plate is only slightly domed. Abbreviations: as in Figs 1, 3. Scale bars in millimetres.
Figure 1 in Who's who among baby brittle stars (Echinodermata: Ophiuroidea): postmetamorphic development of some North Atlantic forms
Figure 1. Asteronyx loveni postlarval development, note the thick, partly removed, skin. A, 1.8 mm dd postlarva dorsal; B, arm of same postlarva, note the radial shields; C, same individual ventral, note the large adoral shields; D, 2.5 mm dd postlarva dorsal; E, same individual ventral; F, arm of same individual lateral; G, vertebra proximal face; H, vertebra distal face; I, bulbous terminal plate; J, 3.2 mm postlarva dorsal; K, same ventral; L, arm distal, note the wide terminal plate; M, 4 mm dd postlarva dorsal; N, same ventral; O, arm spines of same; P, 3.2 mm postlarva vertebra proximal face; Q, distal face. Abbreviations: AS, adoral shield; LAP, lateral arm plate; M, madreporite; PP, primary plates; RPP, radial primary plates; RS, radial shield. Scale bars in millimetres.
Figure 2. Ophioscolex glacialis postlarval development. A, 0.5 in Who's who among baby brittle stars (Echinodermata: Ophiuroidea): postmetamorphic development of some North Atlantic forms
Figure 2. Ophioscolex glacialis postlarval development. A, 0.5 mm dd postlarva dorsal; B, 0.9 mm dd postlarva dorsal; C, 0.9 mm postlarva ventral; D–G, 1.7 mm postlarvae; D, lateral; E, dorsal, note the irregular pattern of plates; F, arm dorsal; G, ventral, a spiniform tooth and two mouth papillae have formed; H, I, 3 mm dd juvenile ventral, note the large adoral shield spine; J, K, adult ventral. Abbreviations: ASS, adoral shield spine; DP, dental plate; OS, oral shield; others as in Fig. 1. Scale bars in millimetres.
Figure 7. Ophiopleura borealis postlarval development. A, B, 0.6 in Who's who among baby brittle stars (Echinodermata: Ophiuroidea): postmetamorphic development of some North Atlantic forms
Figure 7. Ophiopleura borealis postlarval development. A, B, 0.6 mm dd postlarva; A, dorsal, note the high disc, swollen lateral arm plates and dorsal madreporite; B, ventral, note ventral hydropore at madreporite tip (between ASs); C, 0.8 mm dd postlarva dorsal, secondary inter-radial plates have formed above the radial primary plates (IR0); D, E, 1 mm dd postlarva; D, dorsal, secondary radial plates (SRP) have formed above the radial primary plates; E, ventral, the madreporite is now ventral; F, 1.2 mm dd postlarva dorsal; G, H, 1.8 mm dd postlarva; G, dorsal, secondary inter-radial plates (IR2) have formed below the first inter-radial plates (IR1); H, ventral, a second mouth papilla has formed on the dental plate; I, J, 2.6 mm dd juvenile; I, dorsal, the k-plate separates the radial shields proximally; J, ventral; K–L, 5 mm dd juvenile; K, dorsal, note the thick skin on the disc only partly removed; L, ventral; M, arm lateral, note two widely spaced short arm spines; N, arm ventral. Abbreviations: as in Figs 1–3, 5. Scale bars in millimetres.
Figure 5. Ophiolimna bairdi postlarval development. A–D, 1 in Who's who among baby brittle stars (Echinodermata: Ophiuroidea): postmetamorphic development of some North Atlantic forms
Figure 5. Ophiolimna bairdi postlarval development. A–D, 1 mm dd postlarvae; A, dorsal; B, arm dorsal; C, arm ventral; D, ventral; E, 1.6 mm dd postlarva dorsal; F, 1.6 mm dd ventral; G, same, jaw; H, 2 mm dd postlarva. Abbreviations: BS, buccal scale; MP, mouth papilla; OP, oral plate; others as in Figs 1, 2. Scale bars in millimetres.
Figure 4 in Who's who among baby brittle stars (Echinodermata: Ophiuroidea): postmetamorphic development of some North Atlantic forms
Figure 4. Ophiacantha anomala postlarval development, stages taken from brooding animal are termed embryo, free-living stages postlarvae. A, B, 0.6 mm dd embryo dorsal; C, 0.9 mm dd embryo dorsal; D, 1.3 mm dd embryo dorsal; E, 1.3 mm embryo ventrolateral; F, 1.6 mm dd; G, 2 mm dd postlarva ventral; H, 3 mm dd juvenile jaw. Scale bars in millimetres.
Figure 2 in Brittle stars (Echinodermata: Ophiuroidea) from La Réunion and the systematic position of Ophiocanops Koehler, 1922
Figure 2. SEM images of Ophiocanops multispina sp. nov. holotype (MNHN EcOs 23818–23820). A, dorsal view; B, dorsal disc; C, dorsal arm plates beyond gonadal chamber; D, disc spine; E, arm laterally; F, dorsal arm spine; G, ventral arm spines; H, lateral arm plate; I, base of dorsal arm spine; J, ventral overview; K, first ventral arm plate; L, arm ventrally; M, proximal face of vertebra; N, distal face of vertebra. Abbreviations: AS, adoral shield; DAP, dorsal arm plate; LAP, lateral arm plate; M, madreporite; NO, nerve opening; OP, oral papillae; SA, spine articulation; VAP, ventral arm plate. Scale bars in millimetres.
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