Compared to other plant families, the taxonomy of the family is poorly understood due to their great diversity, difficulty in identifying and reduced taxonomic work done on it.

Their widespread distribution over almost the entire Cambrian world, as well as the taxonomic diversity of the species, might be explained by surmising that that they were planktonic during their larval stage.

This finding substantially extended the geographical range of these animals and has raised new questions about the worldwide distribution and great taxonomic diversity they achieved within a relatively short time.

At all taxonomic levels, gastropods are second only to the insects in terms of their diversity.

This taxonomic diversity can be attributed to geographical isolation, climate changes, glaciation, microhabitat differentiation, and different histories of migration or evolution or both.

They are the largest extant conifer family in species diversity, with between 220-250 species ( depending on taxonomic opinion ) in 11 genera, and the second-largest ( after Cupressaceae ) in geographical range, found in most of the Northern Hemisphere with the majority of the species in temperate climates but ranging from sub arctic to tropical.

* Any of the first three definitions, but the clade also has a low taxonomic diversity ( low diversity lineages ).

A close link has been found between vertebrate taxonomic and ecological diversity, that is, the diversity of animals and the niches they occupy.

In 2004, a number of concerned plant enthusiasts founded the North American Sarracenia Conservancy ( NASC ), which aims to " serve as a living record of the taxonomic, morphological and genetic diversity of the genus Sarracenia for purposes of conservation and cultivation.

Each criterion explained less than 24 % of the variation in the other factors, suggesting that even within a single taxonomic class, different mechanisms are responsible for the origin and maintenance of various aspects of diversity.

An evolutionary radiation is an increase in taxonomic diversity or morphological disparity, due to adaptive change or the opening of ecospace.

This region was characterized by lower taxonomic diversity in communities where lambeosaurine were less common and centrosaurs were completely lacking.

Specimens are arranged in 27 cases in taxonomic sequence, thus enabling a complete tour of the diversity of the animal kingdom.

In Ireland also the microscopic Hymenoptera and Diptera are more readily collected, especially in the North, and the macrofauna diversity is very limited by geography so that Ireland the Hymenoptera and Diptera offer more scope for taxonomic study especially of higher taxa.

An animal is a taxonomic member of the Kingdom Animalia.

Amblypoda is a taxonomic hypothesis uniting a group of extinct, herbivorous mammals.

Two other subspecies are described from West and Central Africa, but taxonomic clarification is required.

The major difference between this hypothesis and the single-cause hypotheses is that its proponents view the suggested single causes as either not sufficient in strength to cause the extinctions or not likely to produce the taxonomic pattern of the extinction.

* Some waterfowl, such as gulls, penguins, pelicans, storks, and herons ( Note, waterfowl is not being used in the taxonomic sense-e. g.

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.

This sort of definitional problem is one reason why the use of physical characteristics to name taxonomic groups is now discouraged.

The taxonomic implication is that Owen ’ s original Diprotodon optatum is the only valid species.

Based on the fossil record, the background rate of extinctions on Earth is about two to five taxonomic families of marine invertebrates and vertebrates every million years.

He referred to the amoeba he observed microscopically as ' Amoeba coli '; however it is not clear whether he was using this as a descriptive term or intended it as a formal taxonomic name.

Equidae ( sometimes known as the horse family ) is the taxonomic family of horses and related animals, including the extant horses, donkeys, and zebras, and many other species known only from fossils.

The division of the entire Kingdom Animalia into vertebrates ( about 40000 species in part of one phylum ) and invertebrates certainly is convenient in some practical contexts, but to put it into taxonomic perspective, it is roughly on the same scale as dividing the animal kingdom into Gastropoda ( perhaps 60000 species in part of one phylum ) and non-Gastropoda ; worthwhile only in certain constrained contexts.

The first component of its taxonomic designation, Panthera, is Latin, from the Greek word for leopard, πάνθηρ, the type species for the genus.

This five kingdom scheme is still far from the phylogenetic ideal and has largely been supplanted in modern taxonomic work by a division into three domains: Bacteria and Archaea, which contain the prokaryotes, and Eukaryota, comprising the remaining forms.

Malpighiales is divided into 32 to 42 families, depending upon which clades in the order are given the taxonomic rank of family.

Thus, the term is more one of common application to macroscopic fungal fruiting bodies than one having precise taxonomic meaning.

Merritt Ruhlen notes that this definition is not properly taxonomic but amorphous, since there are broader and narrower degrees of relatedness, and moreover, some linguists who broadly accept the concept ( such as Greenberg and Ruhlen himself ) have criticised the name as reflecting the ethnocentrism frequent among Europeans at the time.

Such an understanding of ontological categories, however, is merely taxonomic, classificatory.

Proboscidea ( from the Latin proboscis ) is a taxonomic order containing one living family, Elephantidae, and several extinct families.

The result of phylogenetic studies is a hypothesis about the evolutionary history of taxonomic groups: their phylogeny.

This article has been described as a "… tour de force, for it covers in less than seven pages the entire taxonomic syntax of Ilocano.

Since chitons were first described by Linnaeus ( 1758 ) there have been extensive taxonomic studies at the species level.

The family was first described by John Edward Gray in 1821, and later assigned to taxonomic ranks within the order of Proboscidea.

Revue et Magasin de Zoologie Pure et Appliquée 2 < sup > e </ sup > Série, T. X Séptembre 1858: 386 .</ ref > The zoologist Reginald Innes Pocock recognized the taxonomic classification of Otocolobus in 1907, described several skulls in detail, and considered the manul being an aberrant form of Felis.

The species ' taxonomic name, Phocaena phocaena, is the Latinized form of the Greek φώκαινα, phōkaina, " big seal ", as described by Aristotle ; this from φώκη, phōkē, " seal ".

Modern scientific taxonomy has been described as " basically a Renaissance codification of folk taxonomic principles.

The name dates back to the taxonomic name of the first species described by Carolus Linnaeus, which he gave the name Caecilia tentaculata.

( 1994 ) redefined the phylum Myxozoa to solve the taxonomic and nomenclatural problems arising from the two host life cycle of myxozoans as first described by Wolf and Markiw ( 1984 ).

The precise meaning is different depending on which taxonomic group is being described.

Its taxonomic history has become entangled with that of the Checker Barb ( Puntius oligolepis ) of Indonesia, described as Capoeta oligolepis by Pieter Bleeker in 1853 and subsequently often placed in Barbus.

There have been over 40 described subspecies of the red squirrel, but the taxonomic status of some of these is uncertain.

First described in 1777 by English illustrator John Frederick Miller, M. murinus remained the only species of its genus, as well as the name used for all mouse lemurs on Madagascar, between the first major taxonomic revision in 1931 and an extensive field study conducted in 1972.

Its taxonomic name may change in the future, because there is a chance it was described and named before 1983.

Callus tissue initiation has been described for many plant taxonomic divisions: Callus Nicotiana tabacum

Knightia belongs to the same taxonomic family as herring and sardines, and resembled the former closely enough that both Knightia alta and Knightia eocaena were originally described as species of herring.

::< font size = 2 >( Note: this list includes names of more recently described species that may, under further taxonomic scrutiny, prove to be synonyms.

In 1994, Murray and Schleifer published a taxonomic note in which they recommended that the new category of indefinite rank ( Candidatus ) be established for certain putative taxa that could not be described in sufficient detail to warrant establishment of a new taxon.

The taxonomic note proposing the establishment of the provisional status Candidatus for incompletely described procaryotes was published in the January 1995 issue of the IJSB.

Although color varieties have no actual taxonomic significance, a large number of color varieties have been described, prominent among them being the varieties serpentinus, vulgaris, cellarius ( typical ), johnstoni, maculatus, ferrussaci, obscurus, fasciatus and rufescens, of Alfred Moquin-Tandon, and cornaliee, of Pini.

Museum collections that had not been previously described were studied ; and sometimes new major taxonomic families — and even orders — had to be described.

Separately isolated in 1935 and described as Lactobacillus sporogenes in the Fifth edition of Bergey's Manual, it exhibits characteristics typical of both genera Lactobacillus and Bacillus, its taxonomic position between the families Lactobacillaceae and Bacillaceae was often debated.