Middle Cambrian echinoderms from north Spain show echinoderms diversified earlier in Gondwana

Zamora, Samuel

doi:10.1130/g30657.1

Cited by 32 publications

(25 citation statements)

References 26 publications

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“…While North America has the best representation of early Cambrian fossil echinoderms, new finds in the middle Cambrian (Series 3, late Stage 5) of Spain suggest that the echinoderm fossil record in Gondwana was both different and more diverse than in Laurentia 20 . Here, we report the discovery of new echinoderm faunas from Cambrian Stage 3 and from the Stage 4-5 boundary interval of Morocco, which represent the oldest faunas from Gondwana and are equivalent in age to the early Cambrian echinoderm-bearing strata in Laurentia.…”

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The oldest echinoderm faunas from Gondwana show that echinoderm body plan diversification was rapid

2013

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The oldest echinoderm faunas from Gondwana show that echinoderm body plan diversification was rapid

2013

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“…Other fossil components include protorthacean and lingulid brachiopods, sponges and echinoderms. Echinoderm assemblages from the uppermost red shales are more diverse than in any other Cambrian locality known (Zamora 2010, Zamora & Smith 2010, Zamora & Álvaro 2010. They include the cinctan Gyrocystis platessa, the eocrinoids Gogia gondi and a new Lichenoididae, the stylophorans Ceratocystis sp.…”

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confidence: 99%

Exoskeletal abnormalities in paradoxidid trilobites from the Cambrian of Spain, and a new type of bite trace

Zamora¹,

Mayoral²,

Esteve³

et al. 2011

Bull. Geosci.

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Exoskeletal abnormalities in middle Cambrian paradoxidid trilobites from Purujosa (Eastern Iberian Chain, NE Spain) are herein analyzed for the first time. Two distinct types are reported. The first is represented by triangular or asymmetrical V-to W-shaped breaks on margins of isolated sclerites (cranidia, free cheeks and hypostomes). The second group is represented by shortened thoracic pleural spines in complete or nearly complete individuals. Possible causes of these injuries are discussed, but in some cases a single cause/effect explanation is not apparent. A new ichnotaxon, Mandibulichnus serratus nov. ichnogen., nov. ichnosp., is erected to refer to serrated breakage of the margins of isolated trilobite sclerites produced by active predation or scavenging.•

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“…3). Se han encontrado fósiles en numerosas localidades y formaciones que pueden consultarse en Zamora (2010), aunque en resumen se puede indicar que aparecen restos de equinodermos en las tres formaciones del Grupo Mesones (Valdemiedes, Mansilla y Murero) y en las Formaciones Borobia, Valdeorea y Torcas, del Grupo Acón.…”

Section: Situación Geográfica Y Geológicaunclassified

“…3). Para ver un resumen de los taxones reconocidos y las localidades fosilíferas en la Zona Cantábrica puede consultarse Zamora (2010).…”

Section: Situación Geográfica Y Geológicaunclassified

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Equinodermos del Cámbrico de España: situación actual de las investigaciones y perspectivas futuras

Zamora

2011

Estud. geol.

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RESUMENEn este trabajo se presenta una revisión histórica de todos los equinodermos cámbricos descubiertos en España, desde su primer hallazgo a finales del siglo XIX y las técnicas actuales que se utilizan para su estudio.El muestreo sistemático de nuevas localidades cámbricas del Norte de España y la revisión de otras ya conocidas, ha proporcionado más de 2.000 ejemplares de equinodermos. En total se han reconocido taxones pertenecientes a cinco clases: Cincta, Eocrinoidea, Edrioasteroidea, Stylophora y Ctenocystoidea, que muestran la mayor diversidad para este periodo en Gondwana.Estos hallazgos muestran que los equinodermos alcanzaron su primer pico de diversidad durante el Cámbrico medio. Esto, unido a la amplia distribución paleobiogeográfica de algunos clados, nos advierte de un origen para muchos grupos en el Cámbrico inferior, donde sólo unos pocos taxones han sido descritos a nivel mundial. Por último se dan algunas ideas de hacia dónde se podrían dirigir los esfuerzos en este campo de conocimiento.Palabras clave: equinodermos, Cámbrico, Gondwana, España, revisión, diversidad ABSTRACT This paper reviews all finds of Cambrian echinoderms from Spain since their first discovery in the XIX century. Recent research techniques used for the study of echinoderms are also described, providing a guide for procedure.Sampling in new fossiliferous localities from the Cambrian of North Spain and the review of classic ones has yielded more than 2,000 echinoderm fossils. These include species belonging to five major classes, Cincta, Eocrinoidea, Edrioasteroidea, Stylophora and Ctenocystoidea, which show the highest diversity reported from Gondwana.These results suggest that echinoderms underwent major diversification during the middle Cambrian, with many groups more widely distributed than previously thought. These arguments suggest that many classes originated in the lower Cambrian where only a few taxa have been described. Finally, I offer some suggestions about where research efforts need to be focussed for a better knowledge of Cambrian echinoderm faunas in Gondwana.

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Middle Cambrian echinoderms from north Spain show echinoderms diversified earlier in Gondwana

Cited by 32 publications

References 26 publications

The oldest echinoderm faunas from Gondwana show that echinoderm body plan diversification was rapid

The oldest echinoderm faunas from Gondwana show that echinoderm body plan diversification was rapid

Exoskeletal abnormalities in paradoxidid trilobites from the Cambrian of Spain, and a new type of bite trace

Equinodermos del Cámbrico de España: situación actual de las investigaciones y perspectivas futuras

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