Cetacea - Wikipedia
Key characteristics are their fully aquatic lifestyle, streamlined body shape, often large size and exclusively carnivorous diet. They propel themselves through the water with powerful up-and-down movement of their tail which ends in a paddle-like fluke, using their flipper-shaped forelimbs to maneuver. [4]
Cetacean | Life Span, Evolution, & Characteristics | Britannica
2024年11月4日 · cetacean, (order Cetacea), any member of an entirely aquatic group of mammals commonly known as whales, dolphins, and porpoises. The ancient Greeks recognized that cetaceans breathe air, give birth to live young, produce milk, and have hair—all features of …
Cetacea - PMC - PubMed Central (PMC)
The anatomy of cetacea varies from domestic mammal species in many ways. The most obvious difference is musculoskeletal, with the lack of hind limbs and evolutionary transformation of the forelimb to a flipper appendage.
Cetaceans - Marine Mammal Anatomy & Pathology Library …
Below you will find links to explore the normal anatomy of a representive odontocete, the harbor porpoise (Phocoeena phocoena).
Cetacea - an overview | ScienceDirect Topics
Cetacea (whales, dolphins, and porpoises) is a model group for investigating the molecular signature of macroevolutionary transitions. Recent research has documented the remarkable convergence between echolocating bats and odontocetes across …
Cetacean Orbital Muscles: Anatomy and Function of the Circular …
Some major features in orbital and oculomotor anatomy seen in cetaceans but not in humans are (1) an “open” orbit with no caudal or ventral bony walls, (2) extremely thick scleral capsules, (3) rectus EOMs with two insertions, (4) well-developed retractor bulbi, and (5) extensive circular muscle layers outside and inside the EOMs (Motais ...
Cetacean Morphology - SpringerLink
2017年7月14日 · Cetacea (whales, dolphins, and porpoises) are mammals fully adapted to life in water so that some typical mammalian traits are not visible from their exterior appearance. The body of cetaceans is streamlined in shape. The head is connected to the body without a distinct neck so that it is merged to a single unit.
Herein we describe the gross neuromus-cular anatomy of cetacean flippers, which may have functional and evolutionary implications. Little is known of the brachial plexus morphology and motor and sensory innervation in cetaceans.
Marino - 2007 - American Association for Anatomy
2007年5月21日 · Two of the most salient features of modern cetaceans are their fully aquatic lifestyle and their large brains. This review article will offer an overview of comparative neuroanatomical research on aquatic mammals, including analyses of odontocete cetacean, sirenian, pinniped, and fossil archaeocete brains.
Skeletons of terrestrial cetaceans and the relationship of whales to ...
2001年9月20日 · Here we report on the skeletons of two early Eocene pakicetid cetaceans, the fox-sized Ichthyolestes pinfoldi, and the wolf-sized Pakicetus attocki. Their skeletons also elucidate the relationships...