Newly discovered 48-million-year-old lizard walked on water in Wyoming

Photographs (A-C) and line drawings (D-F) of the skulls of selected corytophanid species in left lateral view. (A) Corytophanes cristatus (AMNH R 16390), (B) Laemanctus serratus (photograph; AMNH R 44982), (C) Basiliscus vittatus (AMNH R 147832), (D) Laemanctus serratus (line drawing), (E) Geiseltaliellus maarius, and (F) Babibasiliscus alxi taxon nov. (UWBM 89090). Note that it is unclear whether Babibasiliscus alxi taxon nov. had a parietal crest. Reconstructed areas are represented as semi-opaque areas and/or dotted lines. Scale bars equal 10mm. Credit: Conrad JL.; PLoS ONE, 2015 DOI: 10.1371/journal.pone.0127900

A newly-discovered, 48-million-year-old fossil, known as a “Jesus lizard” for its ability to walk on water, may provide insight into how climate change may affect tropical species, according to a study published July 1 in the open-access journal PLOS ONE by Jack Conrad from American Museum of Natural History.

Modern relatives of the Jesus lizard live in an area stretching from central Mexico to northern Colombia, flourishing in the higher temperatures found at the equator. Members of various animal, plant, fungal, and other clades currently confined to the tropics or subtropical areas are often found in fossil records at mid-to-high latitudes from warm periods in Earth history.

The 48-million-year-old fossil, recovered from the Bridger Formation in Wyoming, is the first description of a new species, named Babibasiliscus alxi by the author, and may represent the earliest clear member of the Jesus lizard group, Corytophanidae. This group, which includes iguanas and chameleons, remains poorly understood, due to the small number of fossils available for study.

The author suggests Babibasilscus alxi was likely active during the day and spent a lot of time in trees. A ridge of bone on the skull gave it an angry look while providing shade for its eyes. Each small tooth had three points suitable for eating snakes, lizards, fish, insects and plants, but with a fairly large cheekbone, the lizard may have enjoyed larger prey items as well.

The author suggests that the two-foot long casquehead lizard Babibasiliscus alxi, may have skimmed the surfaces of lush, watery habitats in Wyoming, which at the time probably had a climate matching today’s tropics.

“Given our current period of global climate fluctuation, looking to the fossil record offers an important opportunity to observe what is possible,” said Jack Conrad, “and may give us an idea of what to expect from our dynamic Earth.”

Reference:
Conrad JL. A New Eocene Casquehead Lizard (Reptilia, Corytophanidae) from North America. PLoS ONE, 2015 DOI: 10.1371/journal.pone.0127900

Note: The above post is reprinted from materials provided by PLOS.

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