Palaeohistology of Macrospondylus bollensis (Crocodylomorpha: Thalattosuchia: Teleosauroidea) from the Posidonienschiefer Formation (Toarcian) of Germany, with insights into life history and ecology DOI Creative Commons
Michela M. Johnson, Torsten M. Scheyer, Aurore Canoville

et al.

The Anatomical Record, Journal Year: 2024, Volume and Issue: 308(2), P. 342 - 368

Published: Sept. 28, 2024

Abstract The Posidonienschiefer Formation of southern Germany has yielded an array incredible fossil vertebrates. One the best represented clades therein is Teleosauroidea, a successful thalattosuchian crocodylomorph group that dominated coastlines. most abundant teleosauroid, Macrospondylus bollensis , known from wide range body sizes, making it ideal taxon for histological and ontogenetic investigations. Previous studies examining histology provide basic understanding bone microstructure in teleosauroids, but lack taxonomic, stratigraphic, control required to understand growth palaeobiology within species. Here, we examine three femora one tibia different‐sized M. individuals. We also perform compactness analyses evaluate ecological variation. Our results suggests (1) smallest specimen was young, skeletally immature individual with well‐vascularized‐parallel‐fibered limited remodeling midshaft periosteal cortex; (2) intermediate at death, vascularized parallel‐fibered tissue interrupted by least 10 LAGs, no clear external fundamental system (EFS), rather extensive inner cortical remodeling; (3) largest mature, numerous well‐developed EFS, deep cortex. grew relatively regularly until reaching adult size, global values fall reported modern crocodylians. lifestyle inference models used suggest well adapted aquatic environment retained some ability move on land. Finally, both larger specimens display peculiar, localized area disorganized interpreted as pathological.

Language: Английский

A re-description of the teleosauroid Macrospondylus bollensis (Jaeger, 1828) from the Posidonienschiefer Formation of Germany DOI Creative Commons
Michela M. Johnson, Sven Sachs, Mark T. Young

et al.

PalZ, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 5, 2025

Language: Английский

Citations

0
Palaeohistology of Macrospondylus bollensis (Crocodylomorpha: Thalattosuchia: Teleosauroidea) from the Posidonienschiefer Formation (Toarcian) of Germany, with insights into life history and ecology DOI Creative Commons
Michela M. Johnson, Torsten M. Scheyer, Aurore Canoville

et al.

The Anatomical Record, Journal Year: 2024, Volume and Issue: 308(2), P. 342 - 368

Published: Sept. 28, 2024

Abstract The Posidonienschiefer Formation of southern Germany has yielded an array incredible fossil vertebrates. One the best represented clades therein is Teleosauroidea, a successful thalattosuchian crocodylomorph group that dominated coastlines. most abundant teleosauroid, Macrospondylus bollensis , known from wide range body sizes, making it ideal taxon for histological and ontogenetic investigations. Previous studies examining histology provide basic understanding bone microstructure in teleosauroids, but lack taxonomic, stratigraphic, control required to understand growth palaeobiology within species. Here, we examine three femora one tibia different‐sized M. individuals. We also perform compactness analyses evaluate ecological variation. Our results suggests (1) smallest specimen was young, skeletally immature individual with well‐vascularized‐parallel‐fibered limited remodeling midshaft periosteal cortex; (2) intermediate at death, vascularized parallel‐fibered tissue interrupted by least 10 LAGs, no clear external fundamental system (EFS), rather extensive inner cortical remodeling; (3) largest mature, numerous well‐developed EFS, deep cortex. grew relatively regularly until reaching adult size, global values fall reported modern crocodylians. lifestyle inference models used suggest well adapted aquatic environment retained some ability move on land. Finally, both larger specimens display peculiar, localized area disorganized interpreted as pathological.

Language: Английский

Citations

2