[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]
dinosaur gender in science
"Gender-Specific Reproductive Tissue in Ratites and Tyrannosaurus rex"
Mary H. Schweitzer, Jennifer L. Wittmeyer, and John R. Horner
Science 3 June 2005: 1456-1460
Unambiguous indicators of gender in dinosaurs are usually lost during
fossilization, along with other aspects of soft tissue anatomy. We report the
presence of endosteally derived bone tissues lining the interior marrow
cavities of portions of Tyrannosaurus rex (Museum of the Rockies specimen
number 1125) hindlimb elements, and we hypothesize that these tissues are
homologous to specialized avian tissues known as medullary bone. Because
medullary bone is unique to female birds, its discovery in extinct dinosaurs
solidifies the link between dinosaurs and birds, suggests similar reproductive
strategies, and provides an objective means of gender differentiation in
6X velocizzare la tua navigazione a 56k? 6X Web Accelerator di Libero!
Scaricalo su INTERNET GRATIS 6X http://www.libero.it