<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="6.x">Drupal-Biblio</source-app><ref-type>10</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Araújo, R.</style></author><author><style face="normal" font="default" size="100%">Castanhinha, R</style></author><author><style face="normal" font="default" size="100%">O. Mateus</style></author><author><style face="normal" font="default" size="100%">Martins, R.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Late Jurassic theropod embryos from Porto das Barcas, Lourinhã formation, Portugal</style></title><secondary-title><style face="normal" font="default" size="100%">Journal of Vertebrate Paleontology, Program and Abstracts, 2012,   ISSN 1937-2809 </style></secondary-title></titles><dates><year><style  face="normal" font="default" size="100%">2012</style></year></dates><urls><related-urls><url><style face="normal" font="default" size="100%">https://docentes.fct.unl.pt/sites/default/files/omateus/files/araujo_et_al_mateus_2012_dinosaur_eggs_portugal_svp_2012_abstract_book_meeting_abstracts.pdf.pdf</style></url></related-urls></urls><pages><style face="normal" font="default" size="100%">57</style></pages><abstract><style face="normal" font="default" size="100%">&lt;p&gt;A clutch of several crushed eggs and embryos from the Late Jurassic (near the Kimmeridgian-Tithonian&lt;br /&gt;
boundary), Lourinhã Formation, Portugal contains a complete maxilla, erupted and scattered teeth,&lt;br /&gt;
and presacral vertebrae. The maxilla bears four teeth separated by individualized interdental plates,&lt;br /&gt;
the dorsal process of the maxilla is confluent with the maxillary body, the ventral rim of the antorbital&lt;br /&gt;
fossa is parallel to the tooth row, and the anterior border of the maxilla forms a right angle with the&lt;br /&gt;
ventral margin. The teeth are conical and recurved distally with carinae on mesial and distal sides. The&lt;br /&gt;
vertebrae are amphiplatyan, with a ventral pair of neurovascular foramina and heavily pitted articular&lt;br /&gt;
facets. These fossils allow unambiguous association of basal theropod osteology (Megalosauroidea) with&lt;br /&gt;
a new eggshell morphotype. Synchrotron micro-computed tomographic scanning (SRμCT), scanning&lt;br /&gt;
electron microscopy, and thin-sections under polarized and normal light revealed that the outer&lt;br /&gt;
ornamentation of the eggshell is composed of anastomosing ridges and islets, the pores communicate&lt;br /&gt;
near the outer region of the eggshells, and in radial section they are irregular canals that ramify towards&lt;br /&gt;
the surface. Micro-proto induced x-ray emission (micro-PIXE) analysis of the eggshell (excluding pores)&lt;br /&gt;
revealed the presence of Mg, Fe, Mn (0.33%, 0.27% and 0.18%, respectively) and several trace elements,&lt;br /&gt;
with a corresponding loss of Ca (39.4% detected but 40.0% expected for calcite), which suggests minimal&lt;br /&gt;
eggshell diagenesis. The eggshells do not luminesce, which could imply that no diagenetic alteration&lt;br /&gt;
took effect. However, the quenching effect of Fe2+ has to be taken into consideration. Conversely,&lt;br /&gt;
luminescence is observed in the pores since they are filled with sediment, composed of phyllosilicates,&lt;br /&gt;
as revealed by SRμCT, micro-PIXE and x-ray diffraction analyses.&lt;/p&gt;
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