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The middle cranial fossa is deeper and situated posterior to the anterior fossa. Of course, there are a few others: Dissacusium and Jiangxia from the Asian Paleocene, Guiletes from the Asian Eocene, and Hessolestes from the North American Eocene. Nature 450, 1190-1195. Mesonychids probably originated in Asia, where the most primitive mesonychid, Yangtanglestes, is known from the early Paleocene. Mesonychidae Mesonychid dentition consisted of molars modified to generate vertical shear, thin blade-like lower molars, and carnassial notches, but no true carnassials. The ear structure of Ambulocetus is very interesting as it appears to have only worked while it was underwater.The skull of Ambulocetus is arranged in such a way that it could swallow food while underwater. However, as the order is also renamed for Mesonyx, the term "mesonychid" is now used to refer to members of the entire order Mesonychia and the species of other families within it. a small hoof at the end of the middle toe on its hand. Male mesonychids had thick carnassals which would have been useful for crushing bone, pointing to a scavenger lifestyle. The rounded depression in the floor of the sella turcica is thehypophyseal (pituitary) fossa, which houses the pea-sized pituitary (hypophyseal) gland. 1995. in river estuaries where fresh meets salt water, but can also suggest The sphenoid forms much of the base of the central skull (seeFigure6) and also extends laterally to contribute to the sides of the skull (seeFigure3). nutrition partner kaiser salary. They were also most diverse in Asia where they occur in all major Paleocene faunas. - . The two clades were not homogeneous: maybe diverse ecomorphs prosperated differently in different places. They were endemic to North America and Eurasia during the Early Paleocene to the Early Oligocene, and were the earliest group of large carnivorous mammals in Asia.They are not closely related to any living mammals. Like the Paleocene family Arctocyonidae, mesonychids were once viewed as primitive carnivorans, and the diet of most genera probably included meat or fish. A lateral view of the isolated temporal bone shows the squamous, mastoid, and zygomatic portions of the temporal bone. The skull is divided into the braincase ( neurocr anium) and the facial skeleton ( viscerocranium ). At the time of birth, the mandible consists of paired right and left bones, but these fuse together during the first year to form the single U-shaped mandible of the adult skull. Thewissen, S. I. Madar & S. T. Hussain - 1996.