(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.
Cetacean
Definition:
(n.) One of the Cetacea.
Example Sentences:
(1) Wildlife campaigners say they oppose the keeping of cetaceans in captivity because these animals tend to have poor health and suffer stress-related illnesses as a result.
(2) We offer anatomical evidence for a two layer arterio-venous countercurrent heat exchanger at the cetacean testis.
(3) The Institute of Cetacean Research, a quasi-governmental body that oversees the hunts, had hoped to use sales from the meat to cover the costs of the whaling fleet's expeditions, she said.
(4) At the same time, cetaceans are under threat from a variety of pressures including direct and indirect takes, pollution, and competition for habitat and prey.
(5) Gross compositional data for milk samples of Tursiops truncatus, Sousa plumbea and Delphinus delphis are presented and compared with existing cetacean milk values.
(6) "We are totally against [weakening the original resolution]," said Aimee Leslie, WWF's global cetacean and marine turtle manager.
(7) This unit, which characterizes all delphinids, shows stringent hybridization homology with a 1,740-bp repeat that is characteristic of all other cetacean families.
(8) The Institute of Cetacean Research blamed low demand on the complicated auction procedure and reluctance among food suppliers to attract criticism from anti-whaling groups such as Sea Shepherd .
(9) "For 2013, the catch limits allow the slaughter of 16,655 small cetaceans, but our analysis of available scientific data raises very serious concerns about the sustainability of these hunts."
(10) The lipid components of porpoise lipokeratinocytes appear to subserve not only barrier function in a hypertonic milieu, but also underlie the unique buoyancy, streamlining, insulatory, and caloric properties exhibited as adaptations to the cetacean habitat.
(11) Parasites from 5 species of cetaceans are reported along with their possible role as a contributing factor in stranding behavior.
(12) Pontoporia is less specialized in its shoulder anatomy that most delphinid cetaceans, and shares several characteristics with some mysticetes.
(13) The tandemly organized common cetacean component, which comprises a large portion of all cetacean--both odontocete (toothed whale) and mysticete (whalebone whale)--genomes has a repeat length of 1,760 bp and the three clones analysed showed a high degree of conformity.
(14) Seventeen specimens representing nine cetacean genera (Delphinus, Stenella, Tursiops, Grampus, Delphinapterus, Globicephala, Kogia, Mesoplodon, and Phocoena) were studied post mortem.
(15) The sequence difference between human and the whale and human and the cow was at the same level, indicating that the rate of evolution of the mtDNA rRNA genes is about the same in artiodactyls and cetaceans.
(16) As air breathers that are inseparably tied to the surface, cetaceans are highly trackable; they may thus help in the monitoring of habitat degradation and other long-term ecologic change.
(17) Our observations indicate that these RIAs can reliably detect serum FSH and LH from bottlenosed dolphins and represent the first quantitation of these hormones in cetaceans.
(18) We sequenced the mitochondrial DNA D-loop regions from two cetacean species and compared these with the published D-loop sequences of several other mammalian species, including one other cetacean.
(19) The predominant cell of cetacean epidermis, not found in normal terrestrial mammals, is a lipokeratinocyte, which elaborates not only keratin filaments, but also two types of lipid organelles: first, lamellar bodies, morphologically identical to those of terrestrial mammals, are elaborated in great abundance in all suprabasal epidermal layers, forming intercellular lipid bilayers in the stratum corneum interstices: and second, non-membrane-bounded droplets appear and persist in all epidermal layers.
(20) I do not believe that scientific studies of whales (or any cetacean species) must be lethal in order to be effective for management and conservation of the species.