Sunday, February 3, 2013

New 'Pancake' Stingrays Discovered in the Amazon

source: Our Amazing Planet / Ocean Defender

The photograph below is an x-ray of a freshwater stingray species discovered in 2011 in the Amazon rain forest. The discovery was made by the research team of Nathan Lo...vejoy, a biologist at the University of Toronto in Scarborough; and Marcelo Rodrigues de Carvalho of the University of Sao Paolo in Brazil. The new species is known as Heliotrygon gomesi. Besides the flat round appearance, the ray is big, with slits on its belly and a tiny spine on its tail. The stingray discovery was detailed in the Feb. 24, 2011 edition of the journal Zootaxa.

X-ray of Heliotrygon gomesi, preadult male.

Deep-Sea Chimaera

source: The Science Llama

"Chimaeras are most closely related to sharks, although their evolutionary lineage branched off from sharks nearly 400 million years ago, and they have remained an isolated group ever since. Like sharks, chimaeras are cartilaginous and have no real bones. The lateral lines running across this chimaera are mechano-receptors that detect pressure waves (just like ears). The dotted-looking lines on the frontal portion of the face (near the mouth) are ampullae de lorenzini and they detect perturbations in electrical fields generated by living organisms. This image was captured at the ‘Zona Senja’ site near Sulawesi, Indonesia, on August 2, 2010."