Monotypic
Also known as Sooty Storm-petrel(!)

Relationship to Tristram's Storm-petrel is a little unclear, and may represent a pairing akin to the cool- and hot-season breeding populations of Band-rumped Storm-petrel (discussed in Monteiro and Furness, 1998). Based on personal experience of both from the Ogasawara Islands, however, I would say there are clear structural, plumage and size differences between Matsudaira's and Tristram's Storm-Petrel and they are readily identifable in the field.
 

Identification

Medium to large all dark storm-petrel reminiscent of Black Storm-petrel but with diagnostic white primary shafts. Head relatively large with steep forehead.
 

Where and When

Breeds on Kita-iwo-jima and Minami-iwo-jima in the Japanese Volcano Islands. Ranges through tropical waters from the western Pacific into the Indian Ocean as far as the east coast of African. Kita-iwo-jima has not been visited for many years and the current population status is unknown.
 

Photographs on the web

None
 

Literature

Monteiro, L.R. and Furness, R.W. (1998) Speciation through temporal segregation of Madeiran Storm-petrel (Oceanodroma castro) populations in the Azores? Phil. Trans. R. Soc London B 353:945-953.