In many cases, species that are geographically and phylogenetically very distant from each other have adopted similar morphological structures, physiological functions, and behavioral skills. Morphology of the eyeball from the humpback whale (Megaptera novaeangliae). Vertebral anatomy in the Florida manatee, Evolution of hyperphalangy and digit reduction in the Cetacean manus, Functional morphology and homology in the odontocete nasal complex: implications for sound generation, Hydrodynamic trail‐following in harbor seals (Phoca vitulina), The use of tusks in feeding by dugongid sirenians: observations and tests of hypotheses, Functional anatomy of the hands of fur seals and sea lions, Structural correlates of forelimb function in fur seals and sea lions, Swimming in the California sea lion: morphometrics, drag and energetics, Kinematics and estimated thrust production of swimming harp and ringed seals, Examination of the three‐dimensional geometry of Cetacean flukes using CT‐scans: hydrodynamic implications, Fore limb myology of the pygmy hippopotamus (, Sink or swim? In addition, pygmy hippos bear weight on all of their toes and can prevent the toes from splaying. While most mammals are bilaterally symmetrical, most odontocetes are characterized by directional asymmetry of the skull (i.e., the direction of deviation is consistent). You are currently offline. Anatomical features of the tongue of two chiropterans endemic in the Egyptian fauna; the Egyptian fruit bat (Rousettus aegyptiacus) and insectivorous bat (Pipistrellus kuhlii). Osteology and Functional Morphology of the Forelimb of the Marine Sloth Thalassocnus (Mammalia, Tardigrada). This special issue of the Anatomical Record explores many of the anatomical adaptations exhibited by aquatic mammals that enable life in the water. Although baleen is an aquatic adaptation that enables filter feeding, it has an additional use in humpback whales. Lung breathing. Vascular adaptations channel excess heat from locomotor muscles or the reproductive organs to large flat surfaces (flukes, flippers, fin) which act as radiators (Rommel et al., 1992, 1993, 1995, 2001). A Special Construction of Subepidermal Capillary Loops in the Hippopotamus ( There is so much we still have to learn about aquatic mammals. If hippopotamuses cannot swim, how did they colonize islands: a reply to Mazza. Of interest, the evolution of tail flukes in sirenians is convergent with the evolution of tail flukes in cetaceans. Lung volumes collapse under the high pressures of a deep dive (Boyd, 1975; Ridgway and Howard, 1979). Learn about our remote access options. Anatomical observations on a range of fossil and living marine and freshwater mammals are presented, including sirenians (manatees and dugongs), cetaceans (both baleen whales and toothed whales, including dolphins and porpoises), pinnipeds (seals, sea lions, and walruses), the sea otter, and the pygmy hippopotamus. This has resulted in a multitude of anatomical, physiological, and behavioral differences that allow them to adapt efficiently to diverse functions and lifestyles. Exuberantly sharing knowledge about animal form and function (even if it frightens a poor city boy) is what makes Albertine and Reidenberg so fascinating—and in the case of the latter, is what she has done with this special issue of The Anatomical Record , “The Anatomical Adaptations of Aquatic Mammals” . Flying mammals Morphological Analysis of the Flippers in the Franciscana Dolphin, Pontoporia blainvillei, Applying X‐Ray Technique. The bubbles may also help herd prey into a tighter schooling formation, making it easier to engulf larger numbers of prey during feeding. Most odontocetes also reduce the number of phalangeal elements in digit V, while mysticetes typically retain the plesiomorphic condition of three phalanges. (2007, this issue) test this hypothesis by examining the relationship between skull asymmetry relative to skull size and maximum relative prey size consumed. (2007, this issue) uses CT scans to describe the thickness ratios of cetacean flukes. In addition, the tympanoperiotic complex becomes acoustically isolated from the skull by means of the development of air sinuses. The first fossils definitively corresponding to a mammal were found in rocks of the Jurassic . Cooper et al. These traits enable axial locomotion, specifically dorsoventral bending. Anatomical adaptations of aquatic mammals. La forma de la pupila en el reino animal: de la pseudopupila a la pupila vertical. Lorecentral.org is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to amazon.com.
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