Puplesis ( 1987, 1994 ) placed it in a separate monotypic species-group in " Stigmella ".
12.
Although some debate still exists, in general it is recognized that the fisher is a monotypic species with no extant subspecies.
13.
Day ( 1981 ) treats " P . cinereus " as a monotypic species despite this wide variation across its range.
14.
This is a monotypic species, although in the past Bolle's pigeon was sometimes regarded as a subspecies of the trocaz pigeon.
15.
This is a monotypic species, although in the past the canarian Bolle's pigeon was sometimes regarded as a subspecies of the Trocaz pigeon.
16.
This is a monotypic species, although in the past the Canarian Bolle's pigeon was sometimes regarded as a subspecies of the Trocaz pigeon.
17.
The Trocaz pigeon is a monotypic species, although in the past Bolle's pigeon was sometimes regarded as a subspecies of the Trocaz pigeon.
18.
From that time debate has persisted as to whether the snow petrel represents one monotypic species, one species with two subspecies, or two different species.
19.
At present, " intermedia " is considered a variant and junior synonym of " ruficrissa ", resulting in two monotypic species being recognized:
20.
Today " minimus " is either considered a subspecies of the crested serpent eagle or a monotypic species from the central Nicobar Islands; the Central Nicobar serpent eagle.
