Evolution of mammals - Wikiwand Figure 1:In mammals, the quadrate and articular bones are small and part of the middle ear; the lower jaw consists only of dentary bone While living mammal species can be identified by the presence of milk-producing mammary glands in the females, other features are required in classifying fossils, because mammary glands and other soft-tissue features are not visible in fossils
Eutherians experienced elevated evolutionary rates in the . . . Goswami A 2012 A dating success story: genomes and fossils converge on placental mammal origins Evodevo 3, 4 ( 10 1186 2041-9139-3-18) [PMC free article] [Google Scholar] 16 O'Leary MA, et al 2013 The placental mammal ancestor and the post-K–Pg radiation of placentals Science 339, 662–667
The evolution of the placenta in: Reproduction Volume 152 . . . Cartilaginous fish Viviparity is the most common mode of reproduction in elasmobranchs However, there is a wide range in the degree of maternal provisioning of the embryo after ovulation (Wourms Lombardi 1992), with embryos of some species depending entirely on the yolk sac for all of pregnancy, e g the spiny dogfish, which at birth weighs 40% less than the yolk-filled fertilized egg from
Mole (animal) - Wikipedia In Middle English, moles were known as moldwarps [a] By the era of Early Modern English, the mole was also known in English as mouldywarp or mouldiwarp, [b] a word having cognates in other Germanic languages such as German (Maulwurf), [7] and Danish, Norwegian, Swedish and Icelandic (muldvarp, moldvarp, mullvad, moldvarpa), where muld mull mold refers to soil and varp vad varpa refers to
2. 2. 3: The Origin of Primates - Social Sci LibreTexts The Paleocene was the first epoch in the Age of Mammals Soon after the Cretaceous-Tertiary (K-T) extinction event, new groups of placental mammals appear in the fossil record Many of these groups achieved a broad range of sizes and lifestyles as well as a great number of species before declining sometime in the Eocene (or soon thereafter)