Morphological disparity and systematic ...
Document type :
Article dans une revue scientifique: Article original
DOI :
Title :
Morphological disparity and systematic revision of the eocrinoid genus Rhopalocystis (Echinodermata, Blastozoa) from the Lower Ordovician of the central Anti-Atlas (Morocco)
Author(s) :
Allaire, Ninon [Auteur]
Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement [LGL-TPE]
Évolution, Écologie et Paléontologie (Evo-Eco-Paleo) - UMR 8198 [Evo-Eco-Paléo (EEP)]
Nardin, Elise [Auteur]
Observatoire Midi-Pyrénées [OMP]
Martin, Emmanuel L.O. [Auteur]
Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement [LGL-TPE]
Vaucher, Romain [Auteur]
Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement [LGL-TPE]
Escarguel, Gilles [Auteur]
Laboratoire d'Ecologie des Hydrosystèmes Naturels et Anthropisés [LEHNA]
Lefebvre, Bertrand [Auteur]
Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement [LGL-TPE]
Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement [LGL-TPE]
Évolution, Écologie et Paléontologie (Evo-Eco-Paleo) - UMR 8198 [Evo-Eco-Paléo (EEP)]
Nardin, Elise [Auteur]
Observatoire Midi-Pyrénées [OMP]
Martin, Emmanuel L.O. [Auteur]
Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement [LGL-TPE]
Vaucher, Romain [Auteur]
Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement [LGL-TPE]
Escarguel, Gilles [Auteur]
Laboratoire d'Ecologie des Hydrosystèmes Naturels et Anthropisés [LEHNA]
Lefebvre, Bertrand [Auteur]
Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement [LGL-TPE]
Journal title :
Journal of Paleontology
Pages :
685 - 714
Publisher :
Paleontological Society
Publication date :
2017-07
ISSN :
0022-3360
HAL domain(s) :
Sciences de l'environnement/Biodiversité et Ecologie
English abstract : [en]
The genus Rhopalocystis (Eocrinoidea, Blastozoa) is characterized by both a short stratigraphic range (Fezouata Shale, middle Tremadocian to middle Floian, Lower Ordovician) and a reduced geographic extension (Agdz-Zagora ...
Show more >The genus Rhopalocystis (Eocrinoidea, Blastozoa) is characterized by both a short stratigraphic range (Fezouata Shale, middle Tremadocian to middle Floian, Lower Ordovician) and a reduced geographic extension (Agdz-Zagora area, central Anti-Atlas, Morocco). Since the original description of its type species (R. destombesi Ubaghs, 1963), three successive revisions of the genus Rhopalocystis have led to the erection of nine additional species. The morphological disparity within this genus is here critically reassessed on the basis of both historical material and new recently collected samples. The detailed examination of all specimens, coupled with morphometric and cladistic analyses, points toward a relatively strong support for five morphotypes. A systematic revision of Rhopalocystis is thus suggested, with only five valid taxa: R. destombesi, R. fraga Chauvel, 1971, R. grandis Chauvel, 1971, R. havliceki Chauvel, 1978, and R. zagoraensis Chauvel, 1971. The five others are considered as junior synonyms (R. dehirensis Chauvel and Régnault, 1986, R. lehmani Chauvel and Régnault, 1986, R. sp. A, R. sp. B, and R. sp. C).Show less >
Show more >The genus Rhopalocystis (Eocrinoidea, Blastozoa) is characterized by both a short stratigraphic range (Fezouata Shale, middle Tremadocian to middle Floian, Lower Ordovician) and a reduced geographic extension (Agdz-Zagora area, central Anti-Atlas, Morocco). Since the original description of its type species (R. destombesi Ubaghs, 1963), three successive revisions of the genus Rhopalocystis have led to the erection of nine additional species. The morphological disparity within this genus is here critically reassessed on the basis of both historical material and new recently collected samples. The detailed examination of all specimens, coupled with morphometric and cladistic analyses, points toward a relatively strong support for five morphotypes. A systematic revision of Rhopalocystis is thus suggested, with only five valid taxa: R. destombesi, R. fraga Chauvel, 1971, R. grandis Chauvel, 1971, R. havliceki Chauvel, 1978, and R. zagoraensis Chauvel, 1971. The five others are considered as junior synonyms (R. dehirensis Chauvel and Régnault, 1986, R. lehmani Chauvel and Régnault, 1986, R. sp. A, R. sp. B, and R. sp. C).Show less >
Language :
Anglais
Peer reviewed article :
Oui
Audience :
Internationale
Popular science :
Non
ANR Project :
Source :
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