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A new paper regarding toothed mysticetes is available online: Azucena Solis-Añorve; Gerardo González-Barba; René Hernández-Rivera (2019). "Description of a new toothed mysticete from the Late Oligocene of San Juan de La Costa, B.C.S., México". Journal of South American Earth Sciences. in press. doi:10.1016/j.jsames.2018.11.015. Niparajacetus is the second Oligocene mysticete to be described from Mexico and the southernmost occurrence of an aetiocetid-like mysticete from the Pacific Coast. I wanted to see if anyone has a copy of the this paper because there's no free access at the website for this paper.
Fossil Sand Dollar Baha, Mexico Miocene (3.6-23 Million years ago) The term sand dollar (also known as a sea cookie or snapper biscuit in New Zealand, or pansy shell in South Africa) refers to species of extremely flattened, burrowing sea urchins belonging to the order Clypeasteroida. Some species within the order, not quite as flat, are known as sea biscuits. Related animals include other sea urchins, sea cucumbers, and starfish. Sand dollars, like all members of the order Clypeasteroida, possess a rigid skeleton known as a test. The test consists of calcium carbonate plates arranged in a fivefold radial pattern. The ancestors of sand dollars diverged from the other irregular echinoids, namely the cassiduloids, during the early Jurassic, with the first true sand dollar genus, Togocyamus, arising during the Paleocene. Soon after Togocyamus, more modern-looking groups emerged during the Eocene. Kingdom: Animalia Phylum: Echinodermata Class: Echinoidea Order: Clypeasteroida
DD1991 posted a topic in Fossil LiteratureA book on Mesozoic reptiles of Mexico will be out in 2014...... http://www.iupress.indiana.edu/product_info.php?cPath=1037_3130_3175&products_id=807153 While Mexico's biggest claim to fame in Mesozoic history is that it boasts the asteroid impact site at Chicxulub on the Yucatan Peninsula, what very few people know is that Mexico during the Mesozoic was once inhabited by marine reptiles and boasted the southernmost occurrences of North American ankylosaurs, ceratopsians, tyrannosaurs, hadrosaurs, and dromaeosaurs. While "Plesiosaurus"mexicanus and Amphekepubis were the first Mesozoic reptiles described from Mexico, the significance of Mexico in reconstructing the paleogeography of plesiosaurs, ichthyosaurs, mosasaurs, and marine turtles was only recognized several years ago with the discovery of Cricosaurus vignaudi and C. saltillensis as well as unnamed geosaurines and pliosaurs. As for Mexico's dinosaur fauna, the discovery of Labocania, Magnapaulia, Coahuilaceratops, Velafrons, Huehuecanauhtlus, and Latirhinus has provided considerable insights into the southernmost limits of the North American distribution of the major dinosaur clades that roamed western North America in the Late Cretaceous. Mexico may be famous for its ancient Mayan and Aztec ruins, but it holds the secrets as to how Jurassic ichthyosaurs and plesiosaurs ended up in the Rocky Mountain Formation and it provides us with an idea of how far south the dinosaurs inhabited North America in the Late Cretaceous. "Dinosaurs and Other Reptiles from the Mesozoic of Mexico" will be s must-read for anyone curious to see what life was like in Mexico in Mesozoic times.