Bulweria is a genus

Genus

In biology, a genus is a low-level taxonomic rank used in the biological classification of living and fossil organisms, which is an example of definition by genus and differentia...

 of seabird

Seabird

Seabirds are birds that have adapted to life within the marine environment. While seabirds vary greatly in lifestyle, behaviour and physiology, they often exhibit striking convergent evolution, as the same environmental problems and feeding niches have resulted in similar adaptations...

s in the family

Family (biology)

In biological classification, family is* a taxonomic rank. Other well-known ranks are life, domain, kingdom, phylum, class, order, genus, and species, with family fitting between order and genus. As for the other well-known ranks, there is the option of an immediately lower rank, indicated by the...

 Procellariidae

Procellariidae

The family Procellariidae is a group of seabirds that comprises the fulmarine petrels, the gadfly petrels, the prions, and the shearwaters. This family is part of the bird order Procellariiformes , which also includes the albatrosses, the storm-petrels, and the diving petrels.The procellariids are...

 named after English naturalist James Bulwer

James Bulwer

The Reverend James Bulwer was an English collector, naturalist and conchologist.Bulwer was born at Aylsham in Norfolk and studied at Jesus College, Cambridge...

. The genus has two living species

Species

In biology, a species is one of the basic units of biological classification and a taxonomic rank. A species is often defined as a group of organisms capable of interbreeding and producing fertile offspring. While in many cases this definition is adequate, more precise or differing measures are...

, Bulwer's Petrel

Bulwer's Petrel

The Bulwer's Petrel is a small petrel in the family Procellariidae, and is one of two species in the genus Bulweria . This bird is named after the Scottish naturalist James Bulwer.- Description :...

 (B. bulwerii) and Jouanin's Petrel

Jouanin's Petrel

Jouanin's Petrel is a species of seabird in the Procellariidae family.It is found in Djibouti, Indonesia, Pakistan, Kenya, Maldives, Mozambique, Oman, Saudi Arabia, Seychelles, Somalia, and Yemen....

 (B. fallax). A third species, the Small Saint Helena Petrel, (Bulweria bifax) became extinct in the early 16th century; it is known only from skeletal remains.

Bulweria petrels have long been considered related to the gadfly petrel

Gadfly petrel

The gadfly petrels are seabirds in the bird order Procellariiformes. These medium to large petrels feed on food items picked from the ocean surface....

s in the genus Pterodroma, but recent mtDNA cytochrome b

Cytochrome b

Cytochrome b/b6 is the main subunit of transmembrane cytochrome bc1 and b6f complexes. In addition, it commonly refers to a region of mtDNA used for population genetics and phylogenetics.- Function :...

 sequence

DNA sequence

The sequence or primary structure of a nucleic acid is the composition of atoms that make up the nucleic acid and the chemical bonds that bond those atoms. Because nucleic acids, such as DNA and RNA, are unbranched polymers, this specification is equivalent to specifying the sequence of...

 analysis has proven them to be closely related to the shearwater

Shearwater

Shearwaters are medium-sized long-winged seabirds. There are more than 30 species of shearwaters, a few larger ones in the genus Calonectris and many smaller species in the genus Puffinus...

s in the genus Puffinus

Puffinus

Puffinus is a genus of seabirds in the order Procellariiformes. It comprises about 20 small to medium-sized shearwaters. There are two other shearwater genera: Calonectris, which comprises three large shearwaters, and Procellaria with another four large species...

and especially the Procellaria

Procellaria

Procellaria is a genus of southern ocean long-winged seabirds related to prions and a member of the Procellariiformes order.-Taxonomy:Procellaria is a member of the family Procellariidae and the order procellariiformes. As members of Procellariiformes, they share certain characteristics. First they...

petrels (Bretagnolle et al., 1998).