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Subspecies is abbreviated as subsp. or ssp. and the singular and plural forms are the same ("the subspecies is" or "the subspecies are"). In zoology , under the International Code of Zoological Nomenclature , the subspecies is the only taxonomic rank below that of species that can receive a name.
Variety is defined in the code as follows: "Variety (varietas) the category in the botanical nomenclatural hierarchy between species and form (forma)". The code acknowledges the other usage as follows: "term used in some national and international legislation for a clearly distinguishable taxon below the rank of species; generally, in ...
These differences arise because there are few available ranks and many branching points in the fossil record. Within species further units may be recognised. Animals may be classified into subspecies (for example, Homo sapiens sapiens , modern humans) or morphs (for example Corvus corax varius morpha leucophaeus , the pied raven).
The ratites are mostly large and long-legged, flightless birds, lacking a keeled sternum. Traditionally, all the ratites were place in the order Struthioniformes . However, recent genetic analysis has found that the group is not monophyletic, as it is paraphyletic with respect to the tinamous , so the ostriches are classified as the only ...
Plumage (from Latin pluma 'feather') is a layer of feathers that covers a bird and the pattern, colour, and arrangement of those feathers. The pattern and colours of plumage differ between species and subspecies and may vary with age classes. Within species, there can be different colour morphs.
Pigeon guillemot Adult in breeding plumage Conservation status Least Concern (IUCN 3.1) Scientific classification Domain: Eukaryota Kingdom: Animalia Phylum: Chordata Class: Aves Order: Charadriiformes Family: Alcidae Genus: Cepphus Species: C. columba Binomial name Cepphus columba Pallas, 1811 Range The pigeon guillemot (Cepphus columba) is a species of bird in the auk family, Alcidae. One of ...
Both sexes have a white spot behind the eye. Both sexes also have a forked tail, but the male's is more deeply indented than the female's. The subspecies differ significantly in their plumage. [6] Males of the nominate subspecies have a glittering yellow-green forecrown that transitions through golden yellow to blue on the crown.
Like S. v. faroensis, but intermediate in size between that subspecies and S. v. vulgaris. Birds from Fair Isle, St. Kilda and the Outer Hebrides are intermediate between this subspecies and the nominate and placement with S. v. vulgaris or S. v. zetlandicus varies according to the authority. S. v. granti: Hartert, EJO, 1903 Azores