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Título: | Gigantoproductid shell spiral and microstructure of tertiary layer: evaluation as taxonomical characters |
Autor: | J. Ricardo MATEOS-CARRALAFUENTE; Ismael CORONADO; Cózar, Pedro CSIC ORCID; Sergio RODRÍGUEZ | Palabras clave: | brachiopod, columnar tertiary layer, crystal morphology, Gigantoproductus, taxonomy. | Fecha de publicación: | 2022 | Editor: | Cambridge University Press | Citación: | Earth and Environmental Science Transactions of the Royal Society of Edinburgh 113: 1- 17 (2022) | Resumen: | Brachiopodtaxonomyisbasedondescriptionsofshellmorphologyandkeycharacters, but diagenesis generally modifies orerases some of them, hindering brachiopod identification. Brachiopods that are taxonomically related usually present shells with similar appearance but can differ in size (i.e., Rhynchonellata). Some aspects of morphology¿ for example the angular measurement of the curvature of the shell or details of shell microstructure¿ could aid taxonomic identification. Gigantoproductids, which lack a robust taxonomy, have the largest shells among brachiopods and are ideal for this kind of study because of theirgigantic size and morphological variability. Furthermore, they have a great abundance and worldwide distribution during the mid-Carboniferous. More than 700 samples have been collected from Sierra Morena (Spain), Montagne Noire (France) and Adarouch (Morocco) identifying up to six gigantoproductid genera: Globosoproductus, Semiplanus, Kansuella?, Latiproductus, Gigantoproductus andDatangia. Microstructural features from 170thin sectionsbelonging togigantoproductid ventral valves have been studied, and six crystal morphologies have been distinguished within the tertiary layer: subhorizontal, imbricated, crenulated, acicular, short and long columnar morphologies. Moreover, 23 complete shells from all genera have been selected to investigate shell size and curvature. Results from this study emphasise that shell size, curvature and crystal shape are taxa-related. Finally, a remarkable morphological change in the gigantoproductid populations from the western Palaeo-Tethys occurred during the Viséan¿Serpukhovian, from thin-shelled genera with subhorizontal morphology (Viséan) to thick-shelled genera with a tertiary layer consisting of long columnar crystals (Serpukhovian). This study proves that microstructure, maximum thickness and shell spiral characterisation are robust characters when applied to gigantoproductid taxonomy, but also have great potential in other brachiopod groups. | Versión del editor: | http://dx.doi.org/10.1017/S1755691022000196 | URI: | http://hdl.handle.net/10261/305335 | DOI: | 10.1017/S1755691022000196 | Identificadores: | doi: 10.1017/S1755691022000196 issn: 1755-6910 |
Aparece en las colecciones: | (IGEO) Artículos |
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