(n. pl.) An order of marine mammals, including the whales. Like ordinary mammals they breathe by means of lungs, and bring forth living young which they suckle for some time. The anterior limbs are changed to paddles; the tail flukes are horizontal. There are two living suborders:
Example Sentences:
(1) Among mammals, Cetacea form a subgroup, in that their volumetric data fit an isometric model better than an allometric model.
(2) Thin-layer isoelectric focusing was applied to the identification of whale (Cetacea) species by using water-soluble sarcoplasmic proteins of skeletal muscles.
(3) Comparative ontogenetic investigation of cytoarchitectonics of the cerebral neocortex has been performed in Cetacea and Primates using paraffin frontal and sagittal cerebral sections stained after Nissl.
(4) As demonstrates the investigation of the blood system in the whale (Balaenoptera edeni) performed by means of the macropreparation of corrosive casts and sawcuts, in this species, as in other Cetacea, there is a well developed complex of the arterial rete mirabile, owing to which the brain is supplied with blood.
(5) Completely aquatic marine mammals of the order Cetacea such as whales and dolphins have a reduced or absent olfactory system and neither a vomeronasal organ nor an accessory olfactory bulb.
(6) (Trematoda : Campulidae) a bile duct parasite of the striped dolphin, Stenella coeruleoalba (Meyen, 1833) (Cetacea : Delphinidae), from the Mediterranean Sea.
(7) The non-deciduate placenta in Cetacea that take their origin from ancient carnivores (from procreodonts) demonstrates, in its turn, that the non-deciduate placenta was the initial form.
(8) Similar agranular character of the cerebral cortex differentiation is maintained during the whole subsequent ontogenesis in the Cetacea (heterogenetic type of the neocortex after Brodman).
(9) The above sequence identities and differences reflect the close taxonomic relationship of these five species of Cetacea.
(10) Peculiarities of the cerebral cortical plate differentiation in the Cetacea (absence of the internal granular layer IV) is determined at the stage of stratification.
(11) Perhaps, a comparatively more simple initial architectonics of the Cetacea brain limited the level of their functional possibilities, the latter is comparable only with anthropoid apes.
(12) Although the vomeronasal organ is present in most mammals, it is absent in Cetacea, other fully adapted aquatic species and certain Chiroptera and Old World monkeys-except in the foetal stage.
(13) Absence of the layer IV in the cerebral neocortex determines some other principles in the spatial organization of the cortical-subcortical and in the intracortical connections in the Cetacea brain.
(14) The non-deciduate placenta is especially characteristic for lower primates and Cetacea.
(15) It has been shown, moreover, that among species with convoluted brains, marine mammals (Cetacea) form a subgroup in that the cerebrocortical surface in these animals is more folded than in terrestrial mammals of similar brain size.
(16) Neurohypophysial hormone-Neurophysin complexes have been prepared from posterior pituitary glands of Artiodactyla (ox, sheep, pig), Perissodactyla (horse) and Cetacea (whale), by fractionated salt precipitation.
(17) Jacobson's organ of the vomeronasal system is found in every order of mammals with the possible exception of Cetacea.
(18) At two first stages of the prenatal ontogenesis (formation of the cortical plate and its differentiation into layers) there is not any principle differences between the Cetacea and Primates.
(19) Systemic viral disease has not previously been documented in Cetacea.
(20) The composition and contents of acidic glycolipids in the kidney of a striped dolphin (Stenella coeruleoalba, the order Cetacea, whales) were determined.