The actual number of species in each group depends on the taxonomic classification followed.

The members of this group have a complex taxonomic history, having been assigned to widely differing families in different classification systems.

Under the Cronquist system of taxonomic classification of flowering plants Asteraceae was the only family in the group, but newer systems ( such as APG II and APG III ) have expanded it to eleven.

* Class ( biology ), a taxonomic rank in biological classification

The subdivision of Canidae into " foxes " and " true dogs " may not be in accordance with the actual relations ; also the taxonomic classification of several canines is disputed.

It is closely related to numerical taxonomy which is concerned with the use of numerical methods for taxonomic classification.

That is, plankton are defined by their ecological niche rather than phylogenetic or taxonomic classification.

The taxonomic classification of the red panda has been controversial since it was discovered.

Biological classification is a critical step in the taxonomic process, as it informs the user as to what the relatives of the taxon are hypothesized to be.

In the 1970s, the taxonomic classification of Cannabis took on added significance in North America.

Molecular analytical techniques developed in the late 20th century are being applied to questions of taxonomic classification.

In biology, a genus ( plural: genera ) is a low-level taxonomic rank used in the biological classification of living and fossil organisms, which is an example of definition by genus and differentia.

Between 335 BC – 322 BC, he provided the earliest taxonomic classification of fish, accurately describing 117 species of Mediterranean fish.

If genre functions as a taxonomic classification system, it could constrain individual creativity, since " the presence of many of the conventional features of a genre will allow a strong genre identification ; the presence of fewer features, or the presence of features of other genres, will result in a weak or ambiguous genre identification " ( Schauber 403 ).

Spore types can be used as taxonomic characters in the classification within the Ascomycota.

Although the published classification deliberately did not use formal taxonomic ranks, other sources have treated each of the six as a separate kingdom.

# a taxonomic rank used in the classification of organisms.

Other taxonomic schemes have been proposed ; the most common putting the butterflies into the sub-order Ditrysia and then the " super-family " Papilionoidea, and ignoring a classification for moths.

The taxonomic placement of Welwitschia has changed many times with the development of new classification systems ( see Flowering plants: History of classification ).

Colloquial use of the term dog breed, however, does not conform to scientific standards of taxonomic classification.

Virus classification is the process of naming viruses and placing them into a taxonomic system.

The Code then defines a cultivar as a " taxonomic unit within the classification category of cultivar ".

The presence and morphology of the temporal fenestra are critical for taxonomic classification of the synapsids, of which mammals are part.

Hardwicke's originally proposed taxonomic name was removed from the 1827 publication of his paper with his permission, and naming credit is now given to Cuvier.

Quantum evolution is a component of George Gaylord Simpson's multi-tempoed theory of evolutionary change, proposed to explain the rapid emergence of higher taxonomic groups.

Until 1993, with the taxonomic changes proposed by Taylor, et al., the family Conidae contained only Conus species, but then the family was split into several subfamilies, including many which were previously in the family Turridae.

As a result, acarologists ( the people who study mites and ticks ) have proposed a complex set of taxonomic ranks to classify mites.

The phylogeny of the Acari is still disputed and several taxonomic schemes have been proposed for their classification.

However, the grouping of Sibley & Monroe ( besides leaving the subfamily rank vacant ) is overly coarse due to methodological drawbacks of their DNA-DNA hybridization technique and most of their proposed revisions of taxonomic rank have not been accepted ( see for example Ciconiiformes ).

Garman proposed that it was allied with the " cladodonts ", a now-obsolete taxonomic grouping containing forms that thrived during the Palaeozoic era, such as Cladoselache from the Devonian period ( 416 – 359 Ma ).

A taxonomic classification with fewer species has also been proposed.

The Nektaspida ( also called Naraoiida, Nectaspia and Nectaspida ) is an extinct order of soft-bodied arthropods proposed by Raymond in 1920 ; its taxonomic status is uncertain.

The discoverers ( archaeologist Mike Morwood and colleagues ) proposed that a variety of features, both primitive and derived, identify these individuals as belonging to a new species, H. floresiensis, within the taxonomic tribe of Hominini.

Several phylogenies ( and corresponding taxonomic adjustments ) have been proposed, but though looking reasonable each and every one of them is only weakly supported.

It was also proposed to locate surviving forest patches using aerial photographs and assess the species's taxonomic position.

Reasons for the proposed revisions include birds mistakenly omitted previously, new evidence on geographic distribution, taxonomic changes, etc.

Arthur Francis Hemming, Secretary of the International Commission of Zoologial Nomenclature, summarized all the citations of Hübner ’ s proposed taxonomic names, thereby constraining the possible dates of publication leading to the acceptance of Hübner's works as valid taxonomic publications.

Although several attempts have been made to synonymise many of the proposed names, the taxonomic position of West African jackals, in particular, is too confused to come to any precise conclusion, as the collected study materials are few.

Various taxonomic subdivisions of this species have been proposed.

The order was proposed in 1977 to recognize the family Hymenochaetaceae at a higher taxonomic rank.

The terms chemotype and chemovar were originally introduced to the ICNB in a proposed revision to one of the nomenclatural rules dealing with infrasubspecific taxonomic subdivisions at the 1962 meeting of the International Microbiological Congress in Montreal.