2019年5月10日 · The discovery of two fossil chimaera eggs at different sites in the same general area is unprecedented. These finds, one from the field and one from the collections, highlight the need for more work studying Mesa Verde’s paleontological resources.

2021年7月26日 · We present high-resolution 3D images of Palaeoxyris based on microfocus X-ray computed tomography (μCT) of seven specimens, including fossils that were embedded within a sandstone matrix. Our examination of the internal structure of the egg cases revealed the possible remnants of a yolk and foetus in one specimen.

We present high-resolution 3D images of Palaeoxyris based on microfocus X-ray computed tomography (μCT) of seven specimens, including fossils that were embedded within a sandstone matrix. Our examination of the internal structure of the egg cases revealed the possible remnants of a yolk and foetus in one specimen.

3D imaging of shark egg cases (Palaeoxyris) from Sweden with new insights into Early Jurassic shark ecology. GFF, 143, 229–247 DOI: 10.1080/11035897.2021.1907442

2021年7月26日 · We present high-resolution 3D images of Palaeoxyris based on microfocus X-ray computed tomography (μCT) of seven specimens, including fossils that were embedded within a sandstone matrix. Our...

Palaeoxyris was an enigmatic fossil when first described by Brongniart (1828) as a rhombic patterned capsule with tapered ends. Plant and animal affinities were subsequently suggested for these fossils, but mounting evidence of their shark egg-case origin has finally been accepted by most workers (Fischer and Kogan 2008).

Here we document Palaeoxyris (Spirangium) ‒ fossil shark egg cases from Lower Jurassic successions of southern Sweden. We present high-resolution 3D images of Palaeoxyris based on microfocus X-ray computed tomography (μCT) of seven specimens, including fossils that were embedded within a sandstone matrix.

2022年9月19日 · The best known and most common fossil chondrichthyan egg capsule morphotype is Palaeoxyris (also known by its synonym Spirangium), which has been found in predominantly freshwater deposits of...

Around 307 mya northeastern Illinois was a tropical swamp at the edge of a brackish sea. And was a nursery for the largest and most diverse oc-currence of fossil shark egg capsules in the world. Fayolia ellipticus: The bands are equal in width, and spiral at a low angle. The body lacks. a beak and pedicle. Very rare.

2014年7月4日 · One of the Triassic species of hybodontid sharks was the possible egg producer as these fishes have been shown to penetrate freshwater environments. The process of egg production in the nidamental gland of modern sharks is applied to conjecture about the egg-case structure of ancient sharks.