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30 December 2016 First evidence of an intercalar bone in the braincase of “palaeonisciform” actinopterygians, with a virtual reconstruction of a new braincase of Lawrenciella Poplin, 1984 from the Carboniferous of Oklahoma
Alan Pradel, John G. Maisey, Royal H. Mapes, Isabelle Kruta
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Abstract

We describe here a new Lawrenciella Poplin, 1984 specimen from the Upper Carboniferous (Missourian, Pennsylvanian) from Oklahoma, USA. This specimen is three dimensionnally preserved in a phosphatic nodule. It was scanned by X-Ray microtomography. The neurocranium shows some morphological differences from Lawrenciella schaefferi Poplin, 1984, which might represent individual variability. The parasphenoid and a pair of intercalar bones are associated with the braincase. The presence of intercalars as an anterior extension covering the otico-occipital fissure have not been yet documented in “paleonisciforms” and may have a phylogenetic signal. A discussion about the evolutionary role of such intercalars in the closure of the otico-occipital fissure in modern actinopterygians is provided.

© Publications scientifiques du Muséum national d'Histoire naturelle, Paris.
Alan Pradel, John G. Maisey, Royal H. Mapes, and Isabelle Kruta "First evidence of an intercalar bone in the braincase of “palaeonisciform” actinopterygians, with a virtual reconstruction of a new braincase of Lawrenciella Poplin, 1984 from the Carboniferous of Oklahoma," Geodiversitas 38(4), 489-504, (30 December 2016). https://doi.org/10.5252/g2016n4a2
Received: 26 January 2016; Accepted: 1 August 2016; Published: 30 December 2016
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KEYWORDS
Actinoptérygiens paléozoïques
braincase
intercalaires
intercalar
microtomographie à rayons X
neurocrâne
Paleozoic actinopterygians
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