The subspecies limits are not fully understood yet, and given the species' distribution, the taxonomic identity of the Bulgarian populations needs to be clarified.

The use of molecular and morphological characters to resolve the taxonomic identity of cryptic species: the case of Miniopterus manavi (Chiroptera: Miniopteridae).

Cécile Mourer-Chauviré, Roger Bour & Sonia Ribes: The taxonomic identity of Circus alphonsi (Newton & Gadow 1893), the extinct harrier from Mauritius.

An extension of this research resulted in development of DNA-based stable-isotope probing, which allows examination of links between metabolic function and taxonomic identity of microorganisms in the environment, without the need for culture isolation.

Its taxonomic identity is not entirely clear: it might not be distinct from B. oxyrhynchus, but if it is, the rather indeterminable taxon B. matris might refer to the Rhinofish and be its valid scientific name.

In 1988 and 1989, the species was recorded in La Planada Nature Reserve, Nariño Department, but the taxonomic identity of these birds requires verification.

If taxonomic identity could be maintained right through this greatest of geological transitions, and without major disruption in design to accompany the evolution of hard parts, then the smooth continuity of the cone would be confirmed.

It is only known from its type locality in Bangladesh, but the type is presumed to be lost, and the taxonomic identity of this species remains unclear.

Its taxonomic identity is considered to be unsure.

Since the impact of Canadian Arctic char fish farming in the lake upon the native char population is unknown and the taxonomic identity of the char deemed as Salvelinus inframundus is lacking essential information, a full IUCN Red List assessment cannot be made.