A revealing look
Researchers have developed a 3D model of a dinosaur鈥檚 cloaca, a glimpse into prehistoric pudenda that has never before been seen.
Researchers have developed a 3D model of the cloaca of Psittacosaurus, a dinosaur that lived on the Earth more than 100 million years ago. The cloaca is a multifunctional orifice that exists in birds, reptiles and amphibians 鈥 and the odd mammal 鈥 for defecating, urinating and copulating.
The team published their findings in .
On the team of scientists probing the primeval pudendal pouch was Diane Kelly, visiting professor of biological sciences at 含羞草研究所. Using photographs of living and dead specimens, Kelly cataloged the cloacal structures in order to map the preserved Psittacosaurus specimen.
The intact specimen allowed scientists to model the structure, which they found to be unique from known cloacal topography, but they were unable to pinpoint a penis.
The mystery remains of how Psittocasaurus transmitted its sperm. Kelly believes that most dinosaurs had penises. 鈥淔or the most part, if you have internal fertilization, you have some method of sticking it in,鈥 she told .
Patricia Brennan, associate professor of biology and an expert in genital co-evolution, who also spoke to the newspaper about the research, believes that at least some dinosaurs had penises, but that Psittacosauras may not be one.
鈥淚 am 100 percent certain that at least some dinosaurs had penises,鈥 she said.
Read the .