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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 ...
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 ...
Today, it is treated as a single species with four subspecies. Along with the nominate subspecies A. g. guarauna, A. g. dolosus, A. g. elucus (both J. L. Peters, 1925), and A. g. pictus (F. A. A. Meyer, 1794) are recognized. The difference between the subspecies are related to slight differences in size and plumage. [6]
Birds of the latter two locations have been separated as subspecies californica, and the north west Australian population has been named as subspecies bedouti, but neither is usually considered distinct; [15] the American biologist Robert Pitman and colleagues found no consistent differences between these three subspecies. [29]
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.
Differences between the subspecies are small and geographically gradual. On average, the male of E. c. caliginosa is slightly smaller and darker than the same sex of the nominate subspecies, and also has more streaking on its back, a greenish tint to the yellow of the head and more chestnut on the flanks.
The differences between subspecies are small, making subspecific boundaries hard to define, and the exact distribution of S. a. heineken is unclear, since birds from northwest Africa may be of this form. [13] About 2% of male blackcaps on Madeira and the Azores are melanistic, with black plumage on the whole head and upper breast. [14]