Usted buscó: petromyzontidae (Inglés - Español)

petromyzontidae
petromyzontidae

petromyzontidae (10201xxxxx)
petromyzontidae (10201xxxxx)

family petromyzontidae - lampreys
anguilas lampreas

c02 family petromyzontidae - lampreys
anguilas lampreas

family petromyzontidae - lamprey (organism)
familia petromyzontidae - lamprea

petromyzontidae to carangidae", "zoological catalogue of australia", vol.
petromyzontidae to carangidae", "zoological catalogue of australia", vol.

politics, art, religion,and myth mandates that the definition of fish can vary according to human perspective and sometimes despite science. for example, from a chef's point of view , fishes come in two basic varieties - shellfish and finfish. scientists eschew such groupings of distantly related creatures . however, lest they be hoisted with their own petards, ictiologists might tread gently on the many concepts of fish for they must acknowledge science's inability to form an absolute taxonomic definition of fish based on biological characteristics that are shared by all fishes and yet not shared with any nonfish defining characteristics widespread views of the particular characteristics that define fishes, of course, are biased by general familiarity with the widespread and well - known bony fishes. thus, the notion of a fish as an aquatic ectochemic vertebrate possessing gills, paired and unpaired fins, and scales usually suffices as a casual definition of fish. rasonable as this definition may seem, some of these characteristics are shared with other groups of animals that are not considered fishes, while others of them are not common to all fishes, for example, although most fish live in warwter, some fishes, such as the walking (clarias batracbus) or african lungfish (protopterus species ) cna epend considerable periodsout out of water, which allow them to feed (e.g .., mudskippers, perioptbalmus ssp .., and the arowanas, osteoglossum ssp.) or flee from predators (e.g., flying fishes, exocoetidae). similarly,whereas most fishes cannot control their body temperature other that through behavioral mechanisms onvolving migrations or local movements to and from wathers of varying warmth, some lamnids (lamnidae) and tunas (thunnus spp) and the swordfish (xipbias gladius ) can maintain body temperatures that are severaldegrees higher than the water that surrounds them for significant periods. certainly, most fishes possess a well- developed vertebral column; however, hagfishes ( mixinidae) lack wel- defined vertebrae, and and there is disagreement among scientists regarding wheter this characteristicexists because the ancestors of these fishes were lost from this lineage through evolutionary modification. in fact, so different are hagfishes from other fishes that aristoteles considered them members of another, illegitimate taxonomic group- wornms. unlike worms , fishes are chordates (phylum chordata ), and they posses skeletal components that form a cranium (i.e.., a brain case ). this characteristic (as well as many others ) distinguishes them from some fishlike chordates, such as the lancelets (amphioxiformes), but, of course, amphibians, reptiles, bids, and mammals also have a cranium. gills cannot be used an unequivocal characteristic defining fishes, because some amphibians have and usegillsfor at least a portion of their lives. furthermore, whereas most fishes obtain oxygen from water throug convetional gills, some fishes, significantly supplement gill respiration by aquarium oxigen from the water or atmosphere via modified portions of the gills (e.g., the walking catfish ) or skin (e.g ., the european eel, anguilla anguilla) or specialized tissues in the mouth (e.g., the north america mundsucker goby gillicbtbys mirabilis), gut (e.g., plecostomuses, plecostumus species), swin bladder (e.g., the ceratodus forsteri ). complicating matters still further, some fishes are obligate air breathers and must have access to the atmosphere or they will drown (e.g., the electric eel, electropborus paradoxa). at first glance, fins seem to define fishes. several unrelated groups of nonfishes (e.g., lancelets, sea snakes, and some amphibians ) possess finlike modifications associated with their tails that facilitate locomotion in water. furthermore, although some fishes, such as hafishes and lamreys (petromyzontidae), lack paired fins, the paired appendages of amphibians, reptiles, birds, and mammals are considered homologous to the paired fins of fishes. likewise, the scales that cover many common bony fishes are not a universally acceptable distinguishing feature, because numerous unrelated groups of fishes lack scales, for example, the hagfishes, the lampreys, and the north merican freshwater catfishes(ictaluridae). moreover, those fishes that that possess scalebs may be more or less covered by one of several basic scale types, for example, the placoid scales of sharks, the ganoid scales of gars, and the bony ridge scales of salmon and basses. these differences in the scales of fishes poin to the fact that some other aquatic chordates, such as sea snakes, also have scales, even though the outer converings of reptiles, birds, and mammals ares heavily keratinized, whereas those of fishes are not. superclass pisces as a polyphyletic group give that no one characteristic distinguishes all fishes from all other organisms, even the most committed icthyologist must admint that the superclass pisces ( an assemblage that in
lo que es un pez? el concepto de peces sin duda es más empapados en la tradición de que el respaldo de los científicos, a pesar del hecho de que los ictiólogos acountless, (es decir, los científicos que los peces estudio) han escrito innumerables páginas sobre el tema. la realidad de que los peces en el sentido más amplio, han desempeñado un papel importante en la promoción de la industria y el comercio, la exploración geográfica, política, arte, religión, y los mandatos mito de que la definición de los peces puede variar de acuerdo a la perspectiva humana y, a veces a pesar de la ciencia. por ejemplo, desde el punto de vista del chef, los peces vienen en dos variedades básicas - los crustáceos y peces. científicos evitan esas agrupaciones de las criaturas alejadas. sin embargo, para que no se izó con sus propias redes, ictiologists puede pisar con cuidado en los conceptos de peces porque hay que reconocer la incapacidad de la ciencia para formar una definición absoluta taxonómica de los peces sobre la base de características biológicas que son compartidos por todos los peces y, sin embargo no se comparte cualquier nonfish definiciÓn opiniones caracterÍsticas generalizada de las características que definen a los peces, por supuesto, están sesgadas por la familiaridad general con el amplio y bien - los peces óseos conocidos. por lo tanto, la noción de un pez como ectochemic vertebrados acuáticos poseen branquias, aletas pares y sin pareja, y las escalas por lo general es suficiente como una definición informal de los peces. rasonable ya que esta definición puede parecer, algunas de estas características son compartidas con otros grupos de animales que son