The diploporite blastozoan Lepidocalix pulcher from the Middle Ordovician of northern Algeria: Taxonomic revision and palaeoecological implications
We present revision of the taxonomy and palaeoecology of the Ordovician aristocystitid Lepidocalix pulcher from the Zaouïa of Stita (Great Kabylia, Algeria). An emended diagnosis is proposed, highlighting the four-fold ambulacral system and the typical thecal plating organised in circlets. Lepidocal...
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doaj-2888e691f3c440a991265397c96c66bc2020-11-24T23:28:53ZengInstitute of Paleobiology PASActa Palaeontologica Polonica0567-79201732-24212017-06-0162229931010.4202/app.00286.2016The diploporite blastozoan Lepidocalix pulcher from the Middle Ordovician of northern Algeria: Taxonomic revision and palaeoecological implicationsYamouna Makhlouf0Bertrand Lefebvre1Elise Nardin2Université Frères Mentouri Constantine, FSTGAT, Campus Zouaghi Slimane, Route Aïn el Bey, 25000 Constantine, Algérie-Laboratoire Géodynamique des Bassins Sédimentaires et des Orogènes (LGBSO), Université des Sciences et de la Technologie Houari Boumediene, FSTGAT, BP 32, El Alia, Bab Ezzouar, 16000 Alger, AlgeriaUMR CNRS 5276 LGLTPE, Université Lyon 1, bâtiment Géode, 2 rue Raphaël Dubois, 69622 Villeurbanne, FranceGéosciences Environnement Toulouse, Observatoire Midi-Pyrénées, CNRS, IRD, Université de Toulouse, 14 avenue Edouard Belin, 31400 Toulouse, FranceWe present revision of the taxonomy and palaeoecology of the Ordovician aristocystitid Lepidocalix pulcher from the Zaouïa of Stita (Great Kabylia, Algeria). An emended diagnosis is proposed, highlighting the four-fold ambulacral system and the typical thecal plating organised in circlets. Lepidocalix is here assigned to the subfamily Calicinae of the family Aristocystitidae. The latex casts show fitted sutures between plates, slightly abraded spines, and well-preserved oral surface. The thecal plates possess up to three dipores, each, included into the spines. The presence of such covered diplopores would have reduced the respiration rate, by restricting their exchange surface area. The spines covering the dipores are not articulated and they could have a protective role. Lepidocalix is interpreted as stationary epifauna, probably using iceberg strategy to be stabilized into the soft substrate.http://www.app.pan.pl/archive/published/app62/app002862016.pdfEchinodermataDiploporitataxonomypalaeoecologyOrdovicianAlgeriaStita |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Yamouna Makhlouf Bertrand Lefebvre Elise Nardin |
spellingShingle |
Yamouna Makhlouf Bertrand Lefebvre Elise Nardin The diploporite blastozoan Lepidocalix pulcher from the Middle Ordovician of northern Algeria: Taxonomic revision and palaeoecological implications Acta Palaeontologica Polonica Echinodermata Diploporita taxonomy palaeoecology Ordovician Algeria Stita |
author_facet |
Yamouna Makhlouf Bertrand Lefebvre Elise Nardin |
author_sort |
Yamouna Makhlouf |
title |
The diploporite blastozoan Lepidocalix pulcher from the Middle Ordovician of northern Algeria: Taxonomic revision and palaeoecological implications |
title_short |
The diploporite blastozoan Lepidocalix pulcher from the Middle Ordovician of northern Algeria: Taxonomic revision and palaeoecological implications |
title_full |
The diploporite blastozoan Lepidocalix pulcher from the Middle Ordovician of northern Algeria: Taxonomic revision and palaeoecological implications |
title_fullStr |
The diploporite blastozoan Lepidocalix pulcher from the Middle Ordovician of northern Algeria: Taxonomic revision and palaeoecological implications |
title_full_unstemmed |
The diploporite blastozoan Lepidocalix pulcher from the Middle Ordovician of northern Algeria: Taxonomic revision and palaeoecological implications |
title_sort |
diploporite blastozoan lepidocalix pulcher from the middle ordovician of northern algeria: taxonomic revision and palaeoecological implications |
publisher |
Institute of Paleobiology PAS |
series |
Acta Palaeontologica Polonica |
issn |
0567-7920 1732-2421 |
publishDate |
2017-06-01 |
description |
We present revision of the taxonomy and palaeoecology of the Ordovician aristocystitid Lepidocalix pulcher from the Zaouïa of Stita (Great Kabylia, Algeria). An emended diagnosis is proposed, highlighting the four-fold ambulacral system and the typical thecal plating organised in circlets. Lepidocalix is here assigned to the subfamily Calicinae of the family Aristocystitidae. The latex casts show fitted sutures between plates, slightly abraded spines, and well-preserved oral surface. The thecal plates possess up to three dipores, each, included into the spines. The presence of such covered diplopores would have reduced the respiration rate, by restricting their exchange surface area. The spines covering the dipores are not articulated and they could have a protective role. Lepidocalix is interpreted as stationary epifauna, probably using iceberg strategy to be stabilized into the soft substrate. |
topic |
Echinodermata Diploporita taxonomy palaeoecology Ordovician Algeria Stita |
url |
http://www.app.pan.pl/archive/published/app62/app002862016.pdf |
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