[dinosaur] Hypselohaptodus, new sphenacodontian synapsid from Lower Permian of England

Ooops1

Correction to subject line...

On Thu, Aug 15, 2019 at 8:31 AM Ben Creisler <[email protected]> wrote:

>
> Ben Creisler
> [email protected]
>
>
> A new paper:
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> Hypselohaptodus gen. nov.
> Hypselohaptodus grandis (Paton, 1974)
> Haptodus grandis Paton, 1974
>
>
> Frederik Spindler (2019)
> Re-evaluation of an early sphenacodontian synapsid from the Lower Permian
> of England.
> Earth and Environmental Science Transactions of The Royal Society of
> Edinburgh (advance online publication)
> DOI: https://urldefense.proofpoint.com/v2/url?u=https-3A__doi.org_10.1017_S175569101900015X&d=DwIBaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=0YnH7osWPehiOegnLgWaC4ngaSayVYjrlmPZLDJLNPk&s=yErq23TDgQwBZ7EpewODxCg6W_PqRZ74NvzrJCC5NFQ&e= 
>
> https://urldefense.proofpoint.com/v2/url?u=https-3A__www.cambridge.org_core_journals_earth-2Dand-2Denvironmental-2Dscience-2Dtransactions-2Dof-2Droyal-2Dsociety-2Dof-2Dedinburgh_article_reevaluation-2Dof-2Dan-2Dearly-2Dsphenacodontian-2Dsynapsid-2Dfrom-2Dthe-2Dlower-2Dpermian-2Dof-2Dengland_CEF6308931532407FCF5D6E956815C1C&d=DwIBaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=0YnH7osWPehiOegnLgWaC4ngaSayVYjrlmPZLDJLNPk&s=r8bbpZMNTuT-ICSaE4eB5QqpTNbfmjYMZUBZZJYSE10&e= 
>
>
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> The holotypic isolated maxilla of the early sphenacodontian Haptodus
> grandis from the Cisuralian of England is revisited. A unique character
> combination includes haptodontine-grade traits like less specialised teeth
> and a high number of precanines, but at the same time a shortened lacrimal
> that is separated from the naris, which is strongly diagnostic of
> Sphenacodontoidea. As the specimen cannot be assigned to any known taxon,
> the new taxon Hypselohaptodus grandis gen. nov. is proposed. Comparison
> with other sphenacodontians reveals a mosaic distribution of maxillary
> features, most significantly regarding the precanine region. Preliminary
> character histories preclude Hypselohaptodus from Sphenacodontidae, but
> suggest a haptodontine-grade or basal therapsid position. The latter
> hypothesis is substantiated by an ecological model of episodic wet phases
> in an overall trend of aridification throughout the Permian, to explain the
> rareness of non-sphenacodontid sphenacodontians in the fossil record. Also
> from the early Permian of England, an isolated dentary has previously been
> assigned to Ophiacodon, but can be shown to be either a sphenacodontian,
> possibly affiliated with Hypselohaptodus, or a robust, Stereorhachis-like
> ophiacodontid. The absence of Ophiacodon in the intramontaneous Permian
> basis of Europe is explained by a narrow environmental tolerance range
> requiring limnic connection with lowland basins.
>
>
>
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