New semionotiform (Actinopterygii: Neopterygii) from the Late Jurassic of southern Germany

We report on a new semionotiform taxon, Scheenstia zappi gen. et sp. nov., from Schamhaupten in the Late Jurassic limestones of the Franconian and Swabian Alb, southern Germany. Although the taxon is so far represented by a single specimen, excellent preservation allows a detailed description of its...

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Publicado:	2011
Materias:	Germany Jurassic Kimmeridgian Neopterygii Schamhaupten Semionotiformes anatomy Cretaceous finfish functional morphology limestone paleoenvironment preservation taxonomy Actinopterygii Ajuga reptans Lepidotes Teleostei
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_14772019_v9_n2_p197_LopezArbarello http://hdl.handle.net/20.500.12110/paper_14772019_v9_n2_p197_LopezArbarello
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_14772019_v9_n2_p197_LopezArbarello
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spelling	paper:paper_14772019_v9_n2_p197_LopezArbarello2023-06-08T16:18:09Z New semionotiform (Actinopterygii: Neopterygii) from the Late Jurassic of southern Germany Germany Jurassic Kimmeridgian Neopterygii Schamhaupten Semionotiformes anatomy Cretaceous finfish functional morphology Jurassic limestone paleoenvironment preservation taxonomy Germany Actinopterygii Ajuga reptans Lepidotes Neopterygii Semionotiformes Teleostei We report on a new semionotiform taxon, Scheenstia zappi gen. et sp. nov., from Schamhaupten in the Late Jurassic limestones of the Franconian and Swabian Alb, southern Germany. Although the taxon is so far represented by a single specimen, excellent preservation allows a detailed description of its skeletal anatomy. Scheenstia zappi is distinguished by the presence of a sensory canal in the supraorbital bones and a saddle-like articular surface in the quadratojugal, both features so far unknown in other semionotiforms. The new taxon is further diagnosed by a unique combination of characters: More than three pairs of extrascapular bones; frontals less than three times longer than their maximal width; semitritorial dentition; four anterior infraorbitals; middle pit line contained in a groove in the dermopterotic and parietal; concave posterior border of the angular, robust bugle-like process of the posttemporal bone; large basal fulcra; eleven fin rays in the lower lobe of the caudal fin (below the lateral line); and a first, scale-like caudal fin ray reduced. Among semionotiforms it most closely resembles Lepidotes, in particular the large tritorial forms of the Late Jurassic and Early Cretaceous of Europe, such as L. mantelli, L. maximus and L. laevis. The peculiar shape of the quadratojugal in Scheenstia zappi resembles the condition in some basal teleosts in which a ventral articular surface of the quadrate probably served in the rotation of the lower jaw. Copyright © 2011 The Natural History Museum. 2011 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_14772019_v9_n2_p197_LopezArbarello http://hdl.handle.net/20.500.12110/paper_14772019_v9_n2_p197_LopezArbarello
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Germany Jurassic Kimmeridgian Neopterygii Schamhaupten Semionotiformes anatomy Cretaceous finfish functional morphology Jurassic limestone paleoenvironment preservation taxonomy Germany Actinopterygii Ajuga reptans Lepidotes Neopterygii Semionotiformes Teleostei
spellingShingle	Germany Jurassic Kimmeridgian Neopterygii Schamhaupten Semionotiformes anatomy Cretaceous finfish functional morphology Jurassic limestone paleoenvironment preservation taxonomy Germany Actinopterygii Ajuga reptans Lepidotes Neopterygii Semionotiformes Teleostei New semionotiform (Actinopterygii: Neopterygii) from the Late Jurassic of southern Germany
topic_facet	Germany Jurassic Kimmeridgian Neopterygii Schamhaupten Semionotiformes anatomy Cretaceous finfish functional morphology Jurassic limestone paleoenvironment preservation taxonomy Germany Actinopterygii Ajuga reptans Lepidotes Neopterygii Semionotiformes Teleostei
description	We report on a new semionotiform taxon, Scheenstia zappi gen. et sp. nov., from Schamhaupten in the Late Jurassic limestones of the Franconian and Swabian Alb, southern Germany. Although the taxon is so far represented by a single specimen, excellent preservation allows a detailed description of its skeletal anatomy. Scheenstia zappi is distinguished by the presence of a sensory canal in the supraorbital bones and a saddle-like articular surface in the quadratojugal, both features so far unknown in other semionotiforms. The new taxon is further diagnosed by a unique combination of characters: More than three pairs of extrascapular bones; frontals less than three times longer than their maximal width; semitritorial dentition; four anterior infraorbitals; middle pit line contained in a groove in the dermopterotic and parietal; concave posterior border of the angular, robust bugle-like process of the posttemporal bone; large basal fulcra; eleven fin rays in the lower lobe of the caudal fin (below the lateral line); and a first, scale-like caudal fin ray reduced. Among semionotiforms it most closely resembles Lepidotes, in particular the large tritorial forms of the Late Jurassic and Early Cretaceous of Europe, such as L. mantelli, L. maximus and L. laevis. The peculiar shape of the quadratojugal in Scheenstia zappi resembles the condition in some basal teleosts in which a ventral articular surface of the quadrate probably served in the rotation of the lower jaw. Copyright © 2011 The Natural History Museum.
title	New semionotiform (Actinopterygii: Neopterygii) from the Late Jurassic of southern Germany
title_short	New semionotiform (Actinopterygii: Neopterygii) from the Late Jurassic of southern Germany
title_full	New semionotiform (Actinopterygii: Neopterygii) from the Late Jurassic of southern Germany
title_fullStr	New semionotiform (Actinopterygii: Neopterygii) from the Late Jurassic of southern Germany
title_full_unstemmed	New semionotiform (Actinopterygii: Neopterygii) from the Late Jurassic of southern Germany
title_sort	new semionotiform (actinopterygii: neopterygii) from the late jurassic of southern germany
publishDate	2011
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_14772019_v9_n2_p197_LopezArbarello http://hdl.handle.net/20.500.12110/paper_14772019_v9_n2_p197_LopezArbarello
_version_	1768544429231046656

New semionotiform (Actinopterygii: Neopterygii) from the Late Jurassic of southern Germany

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