In addition, fossil remains of some hitherto undescribed prehistoric species have been found.

: Similar but hitherto undescribed remains are known from on Kauaʻi and Oʻahu.

An undescribed prehistoric species is known only from Early Pleistocene fossil remains found at Dursunlu, Turkey ; it might however be referrable to a paleosubspecies of an extant species considering its age ( see also Greater Scaup ).

However, the position of the undescribed fourth species was only based on a single synapomorphy ( derived group-defining character ) in one specimen, so some uncertainty in its placement remains.

Sasí remains undescribed, so it is not clear how divergent it may be.

This scheme has been described as chaotic, possibly omitting undescribed species including synonyms remains.

In 2008, fossil remains of an undescribed plesiosaur currently informally named Predator X were unearthed in Svalbard.

Discoveries included unexpected sub-fossil remains of large extinct lemurs and surviving but previously undescribed species of blind fish, shrimps and other invertebrates.

A leg of an undescribed small diver was found in the Late Oligocene deposits at Enspel ( Germany ); it too may or may not belong to Colymboides.

Less closely related is the Robertson Dwarf Chameleon, another aridland species which is found in Western Cape province inland from the range of the Cape Dwarf Chameleon and may be a cryptic species complex, and an undescribed population from the Swartberg mountains.

Both feelings involved an expected change in activity in the anterior insula, anterior cingulate, hypothalamus, and midbrain, but they also found a previously undescribed pattern of cortical activity on the posterior medial surface of each brain hemisphere, a region involved in the default mode of brain function, and implicated in self-related processes.

A currently undescribed genus in the western United States may hold an altitude record for the family, being found up to over 11, 000 feet ( 3, 300 meters ).

Despite many fossil birds being found in the islands between these two areas being found none of these were of undescribed Cyanoramphus species.

Another mekosuchine fossil, currently undescribed, has been found in Miocene deposits from New Zealand.

The very large Orthonyx hypsilophus from Green Waterhole Cave and an undescribed species found in Pyramids Cave which was a bit smaller than the Australian Logrunner are probably of Late Pleistocene age.

Additional populations have been found at the periphery of its range, but these are thought to represent new, undescribed species.

The last galeaspid is an as of yet undescribed species and genus from the Fammenian epoch of the Late Devonian, found in association with the tetrapod Sinostega and the antiarch placoderm Remigolepis, in strata from the Northern Chinese province of Ningxia.

Some 70 – 95 % of all beetle species, depending on the estimate, remain undescribed.

While more work on undescribed specimens is required before firm consensus is reached, the discovery of P. spinosa, which strongly resembles modern Chaetognaths, in sediments of a similar age in Chengjiang biota places doubts on its position in the Chaetognath crown group.

It might be based on some of the Chinese material they mentioned as undescribed.

* " Medicarum Observationum rararum liber, 1567, ( A book of medical observations on rare, hitherto undescribed diseases ), translated into German as:

Recent evidence suggests that birds on the Atlantic coast of southwest Europe are distinct from all three, and may be an as-yet undescribed subspecies ( Yésou et al., Brit.

One consists of forms that radiated on the seawards slopes of the Drakensberg mountains: the southern Drakensberg Dwarf Chameleon, the northern Transvaal Dwarf Chameleon, and what appears to be undescribed species from the Ngome Forest on the SE slopes.

In spring 2004, a previously undescribed disease killed off 60 % of Yellow-eyed Penguin chicks on the Otago peninsula and in North Otago.

The katipo has only one known direct predator: a small, undescribed native wasp from the family Ichneumonidae has been observed feeding on katipo eggs.

" He said it was " an undescribed species ", indicating that it was distinct from the species ( L. culpaeus and L. griseus ) that occur on the mainland.

( Additional note on the metamorphosis of some species of Diptera hitherto undescribed or known but imperfectly ).

( 2004 ) suggested it was a basal carnosaur ( possibly a sinraptorid ) on the basis of data from undescribed specimens.

By 1986, at least 20 such birds had been observed in various locations on the south and east coasts of the continent, although no consensus existed about their identity ; among the theories postulated were that the birds were aberrant individual or a previously undescribed subspecies of the Dunlin, or that they were a stereotyped hybrid ( meaning that all birds of some hybrid parentage appear near-identical ).

It appears to belong to a group of Mediterranean and adjacent Atlantic species which includes the Yelkouan Shearwater ( Austin 1996 ) and one to three prehistorically extinct taxa, Hole's and possibly also Olson's Shearwater and an undescribed form of unclear distinctness from Menorca ( Alcover 2001 ).

The Yelkouan Shearwater appears to belong to a group of Mediterranean and adjacent Atlantic shearwaters which includes the Balearic Shearwater and one to three prehistorically extinct taxa, Hole's and possibly also Olson's Shearwater as well as an undescribed population of uncertain distinctness from Menorca.

Around 620 species have been recognised so far, with may more undescribed.

The subphylum Crustacea comprises almost 67, 000 described species, although the number of undescribed species may be 10 – 100 times higher.

Skin impressions from an as-yet undescribed specimen show that some species may have been covered in bristle-like structures, similar to the more primitive ceratopsian Psittacosaurus.

Other undescribed species may exist.

A population of the Tenkile recently discovered from the Bewani Mountains may represent an undescribed subspecies.

Some undescribed fossils from the Middle Jurassic of England may represent earlier versions.

Additionally, still undescribed species are known to exist ( e. g. the " Apurimac Tapaculo " and " Millpo Tapaculo "; both from Peru ), while some species as currently defined actually may include several species ( e. g. the southern population of the Large-footed Tapaculo may represent a yet undescribed species ).

It may have been an undescribed taxon, but more likely it was not ; it could simply have been a vagrant of a known species.

The undescribed Viti Levu Gallinule of Fiji would either be separated in Pareudiastes if that genus is considered valid, or may be a completely new genus.

Similarly, the undescribed Mangaia " swamphen ," currently tentatively assigned to Porphyrio, may belong to Gallinula / Pareudiastes.

Some undescribed specimens in the BYU collections may have reached up to long, though these await more detailed study.

Some may have grown larger ; undescribed specimens of Utahraptor in Brigham Young University collections belonged to individuals that may have reached up to long, though these await more detailed study.

In biology, the abbreviation has one additional use in open nomenclature: it denotes specimens or populations that resemble a known taxon, but differ in details ; they thus may or may not refer to an undescribed taxon.