species

(redirected from species difference)
Also found in: Dictionary, Thesaurus, Legal, Encyclopedia.

species

 [spe´shēz]
a taxonomic category subordinate to a genus (or subgenus) and superior to a subspecies or variety; composed of individuals similar in certain morphologic and physiologic characteristics.
type species the original species from which the description of the genus is formulated.

spe·cies

, pl.

spe·cies

(spē'shēz), Avoid the mispronunciation spē'sēz. The singular and plural forms of this word are both species. Specie is not the singular of species. A species name begins with a lowercase letter and is printed in italic type: [Branhamella] catarrhalis, [Pneumocystis] jiroveci. When a species is unknown or not identified, the abbreviation sp., in roman type, is used: Rhizpus sp. (one unidentified species of Rhizopus), Bacteroides spp. (more than one unidentified species). Avoid slang abridgments of species names such as "H. flu" (Haemophilus influenzae).
1. A biologic division between the genus and a variety or the individual; a group of organisms that generally bear a close resemblance to one another in the more essential features of their organization, and breed effectively producing fertile progeny.
2. A class of pharmaceutical preparations consisting of a mixture of dried plants, not pulverized, but in sufficiently fine division to be conveniently used in the making of extemporaneous decoctions or infusions, as a tea.
[L. appearance, form, kind, fr. specio, to look at]

species

/spe·cies/ (spe´shēz) a taxonomic category subordinate to a genus (or subgenus) and superior to a subspecies or variety.
type species  the original species from which the description of the genus is formulated.

species

(spē′shēz, -sēz)
n. pl. species
1. Biology A group of closely related organisms that are very similar to each other and are usually capable of interbreeding and producing fertile offspring. The species is the fundamental category of taxonomic classification, ranking below a genus or subgenus. Species names are represented in binomial nomenclature by an uncapitalized Latin adjective or noun following a capitalized genus name, as in Ananas comosus, the pineapple, and Equus caballus, the horse.
2. Chemistry A set of atoms, molecules, ions, or other chemical entities that possess the same distinct characteristics with respect to a chemical process or measurement.

species (Sp)

[spē′sēz, spē′shēz] pl. species (sp., spp.)
Etymology: L, form
the category of living things below genus in rank. A species is a genetically distinct group of demes that share a common gene pool and are reproductively isolated from all other such groups. See also deme, genus.

spe·cies

, pl. species (spē'shēz)
1. A biologic division between the genus and a variety or the individual; a group of organisms that generally bear a close resemblance to one another in the more essential features of their organization, and that breed effectively, producing fertile progeny.
2. A class of pharmaceutical preparations consisting of a mixture of dried plants, not pulverized, but in sufficiently fine division to be conveniently used in the making of extemporaneous decoctions or infusions, as a tea.
[L. appearance, form, kind, fr. specio, to look at]

species

the lowest (taxonomic) grouping of animals or plants which, at least potentially, forms an interbreeding array of populations unable to breed freely with other sorts of animal or plant. Thus members of a species have breeding compatibility and produce fertile offspring. The species is the only natural unit (taxon) of CLASSIFICATION. It is usually recognized on the basis of morphological characters (a MORPHOSPECIES), but different species can be morphologically identical (sibling species), for example, Drosophila pseudoobscura and D. persimilis exhibit behavioural differences leading to REPRODUCTIVE ISOLATION. see BINOMIAL NOMENCLATURE. For asexually reproducing organisms, such as bacteria, a precise definition of species has not been universally formulated and agreed. Generally individuals displaying a high degree of similarity based on biochemical, genetic and morphological characteristics, for example, are grouped as species.

species

a taxonomic category subordinate to a genus (or subgenus) and superior to a subspecies or variety; composed of individuals similar in certain morphological and physiological characteristics, the important one of which is that they are capable of interbreeding to produce fertile and viable offspring.

species difference
the difference between species in their response to therapeutic agents, poisons and infections due to physical, biochemical, immunological differences.
species specialist
a veterinarian who specializes in the diseases and management of an individual animal species.
type species
the original species from which the description of the genus is formulated.
References in periodicals archive ?
Differences in VIP projections from the SCN to ORX neurons may contribute to species differences in the regulation of the sleep wake cycle: whereas in grass rats regulation may be in part mediated by direct projections from the SCN to areas involved in arousal, in the nocturnal lab rat this regulation may involve an indirect pathway that connects the SCN to neurons in the lateral and posterior hypothalamus.
Debates on the genetics of species differences predate the neo-Darwinian synthesis, when some biologists thought species differences were usually polygenic (e.
The GI tract may also play an important role in the biotransformation of metabolites of all types of compounds excreted via the bile that are subsequently reabsorbed (enterohepatic cycling), with clear species differences (Malik et al.
Because of the species differences in the relationship between body mass and metabolic rate (i.
Moreover, the aim was to illustrate species differences in germination response to soil temperature by predicting the expected time to germination for the three species at various times of the year, depending on the soil temperature fluctuations in a typical Danish soil.
This may arise through species differences in egg size, vitelline membrane permeability, lysin efficacy, success of the acrosome reaction or sperm morphology.
Statistical analyses of the heating data indicated significant species differences for heating time to 56[degrees]C, with white oak stringers heating faster than red oak stringers but not yellow-poplar stringers.
Such transmission would be rare because of species differences and the low transmissibility of LDV.
Assuming continuity between the behavior of nonhumans and humans readily allows for the identification of genuine species differences, should they exist, and thus "it is only by studying the behavior of lower animals that we can tell what is distinctly human" (Skinner, 1969, p.
During our investigations into the sources of variability in mixed northern hardwood kraft pulps, we evaluated regional and species differences between red and sugar maples.
Previous reports of severe genetic, immune, or other genetic abnormalities in cloned animals may be due to species differences or variations in cloning techniques, the researchers speculated.
Species differences in seedling survival in deeply shaded understories (i.