Insert generic frog photo here! A fascinating article discusses how rapid DNA sequencing has confirmed the existence (and hinted at the secretive habits) of a rare frog from Brazil, Megaelosia bocainensis. Thought to have gone extinct in 1968, the endangered frog (more precisely, its DNA) was recently rediscovered by the use of “metabarcoding” which focuses on taking DNA samples (using very non-invasive procedures) of the entire community in which the animal lives, and filtering out the non-amphibian material. Though scientists caution that this decades-old technique is not a substitute for more traditional studies, its new application of monitoring complex habitats to find threatened species offers an intriguing path for future research.
A very strange-looking reptile once lurked in the waters of the earth in the Triassic period, and a new study sheds light on why its appearance was so odd. This ancient reptile, Tanystropheus, had a slender neck that literally made up half the length of its body! Scientists scratched their collective heads over this long neck for over 170 years, but recently began examining the fossils of this venerable creature using advanced X-rays and computerized tomography. They came to the conclusion that Tanystropheus (which came in two varieties, large and small) hunkered down on the shallow coastal ocean floor and raised its head out of the water, with its nostrils on top like a crocodile’s, to hunt. It would lift its long neck up to get a breath of air, and gape its mouth open to wait for prey—fish and squid for the larger animals, shrimp for the smaller—to pass by. Then—dinnertime! More information about this fascinating reptilian ancestor may be found here.
Lifestyles of the Reptilian and Famous? A recent study of fossil records sheds light on the ecological evolution of a variety of creatures in the ancient seas of earth’s Mesozoic period. While the dinosaurs roamed the terrestrial surface, giant creatures such as ichthyosaurs and plesiosaurs (two kinds of marine reptiles) swam the oceans. These giants (some measuring over thirty feet long!) were examined for where they lived, how they moved through the water, and what they ate. The complex analysis led to six different categories of marine reptiles, separating them into widely diverse groups such as active predators within the water and reptiles that also foraged on land. Many more details about the habits of these venerable reptiles of the sea may be found in the article here.
That alligator lizard zipping furtively around your yard may never know it, but its relative, a new species of Abronia (alligator lizards), has been discovered and named in the western Chiapas region of Mexico. The full scientific designation for the reptile, Abronia morenica, pays tribute to the brown coloring of this handsome lizard and to the Sierra Morena region it comes from (“moreno” meaning brown), which some may remember from the traditional song “Cielito Lindo.” The inhabitants of the Sierra Morena are justifiably proud of this rare discovery deep within the montane cloud forests of the region and are working with scientists to protect its endangered population. A more complete summary of the article (taken from a paper published in the journal Herpetologica) may be found here.
Last week’s post, based on our recently-rediscovered, 25+ year old RARN event display, focused on an iguana that had been poorly cared for, that ended up healthy and contented. This week we offer the story of a water dragon suffering from her (probably well-intentioned but clueless) owner’s terrible husbandry—with another reasonably happy ending. The female dragon “was kept in a poultry-net cage (chicken wire), where she kept rubbing her face against the wire, trying to get out. Repeated scraping of the skin off her nose and mouth resulted in so much scar tissue building up that she [could] no longer breathe through her nose.” The creature lost eight of her front ten toes due to the sharpness of the chicken wire, and when brought in to RARN was emaciated and dehydrated, with a mouth infection. But again, our caring corps of RARN volunteers went to work on the water dragon, so that later, she became “healthy, robust and active, and … adapted well to getting around with her deformed feet.” Names and faces have changed over the years, but the song remains the same – RARN helps scaly (or amphibious) creatures in need!