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A field guide to the Silurian Echinodermata of the British Isles: Part 1 - Eleutherozoa and Rhombifera Naturalis
Lewis, D.N.; Donovan, S.K.; Crabb, P.; Gladwell, D.J..
The Palaeozoic echinoderms of the British Isles are most diverse in the Silurian and Lower Carboniferous. This guide discusses and illustrates members of all major groups of echinoderms, apart from the crinoids, from the Silurian of these islands. Groups considered include the echinoids (five taxa), ophiuroids (ten taxa) and asteroids (thirteen taxa), and the extinct ophiocistioids (three species) and rhombiferan cystoids (nine species).
Tipo: Article / Letter to the editor Palavras-chave: Echinoderms; Silurian; British Isles; Echinoids; Asteroids; Ophiuroids; Cystoids; Ophiocystitoids; 38.22; 42.72.
Ano: 2007 URL: http://www.repository.naturalis.nl/record/217414
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An additional record of Oichnus excavatus Donovan & Jagt from the Maastrichtian (Upper Cretaceous) of southern Limburg, The Netherlands Naturalis
Donovan, S.K.; Jagt, J.W.M..
A single example of Oichnus excavatus Donovan & Jagt, infesting the holasteroid echinoid Hemipneustes striatoradiatus (Leske), is reported from the upper Meerssen Member, Maastricht Formation (uppermost Maastrichtian), of the former Blom quarry, Berg en Terblijt, southern Limburg, The Netherlands. This is the first evidence that O. excavatus may be more widely distributed in the type area of the Maastrichtian than previously assumed. The embedment structure occurs just below the ambitus and close to the peristome, suggesting that the producing organism may have been ingesting detritus from the sea floor rather than filter feeding, the more usual interpretation of its behaviour.
Tipo: Article / Letter to the editor Palavras-chave: Embedment structure; Trace fossils; Oichnus; Echinoids; Hemipneustes; Maastrichtian; The Netherlands; 42.72.
Ano: 2005 URL: http://www.repository.naturalis.nl/record/210110
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Archaeocidaris M’Coy (Echinoidea) from the Carboniferous of Egypt Naturalis
Lewis, D.N.; Donovan, S.K..
Collections in museums usually have boxes of specimens which remain ‘undiscovered’ and yet which may be of importance or interest. The recent rediscovery of specimens of Archaeocidaris in the Nationaal Natuurhistorisch Museum, Leiden, from the Carboniferous of Egypt illustrates this point. These specimens were collected in 1938 by Dr. H.M.E. Schürmann (1891-1979), who had been a student of Professor J. Wanner (1878-1956), the noted expert on fossil echinoderms. The Egyptian Archaeocidaris plates include interambulacrals and radioles. These are closest to Archaeocidaris rossica (von Buch) from the Moscow area of Russia, although there are sufficient differences in radiole morphology to suggest that they are not necessarily conspecific.
Tipo: Article / Letter to the editor Palavras-chave: Systematics; Echinoids; Archaeocidaris; Carboniferous; Egypts; 42.72.
Ano: 2005 URL: http://www.repository.naturalis.nl/record/210114
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Lower Miocene echinoderms of Jamaica, West Indies Naturalis
Donovan, S.K.; Portell, R.W.; Veltkamp, C.J..
Despite being diverse globally, Miocene echinoids are poorly known from Jamaica. Moderately diverse echinoids and other echinoderms have been identified mainly from fragmentary specimens collected from chalks and mass-flow deposits of the Lower Miocene Montpelier Formation, White Limestone Group, near Duncans, parish of Trelawny. This locality has yielded the most diverse association of fossil echinoderms known from the Miocene of Jamaica, including at least ten species in four classes. This fauna is comprised of the isocrinid crinoids Neocrinus sp. cf. N. decorus (Wyville Thomson) and Isocrinus sp.; the ophiuroid Ophiomusium? sp.; the asteroids Astropecten? spp.; and the echinoids Prionocidaris? sp., Histocidaris sp., Echinometra sp. cf. E. lucunter...
Tipo: Article / Letter to the editor Palavras-chave: Systematics; Crinoids; Asteroids; Ophiuroids; Echinoids; Neogene; Caribbean; 42.72.
Ano: 2005 URL: http://www.repository.naturalis.nl/record/210104
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