Galapagos Petrel

Here the details of the Galapagos Petrel named bird below:

SCI Name:  Pterodroma phaeopygia
Protonym:  Oestrelata phaeopygia Trans.Zool.Soc.London 9 p.507 pl.88 fig.1,3
Taxonomy:  Procellariiformes / Procellariidae / Pterodroma
Taxonomy Code:  galpet
Type Locality:  Chatham Island, Galapagos.
Author:  Salvin
Publish Year:  1876
IUCN Status:  Critically Endangered

DEFINITIONS

PTERODROMA
(Procellariidae; Ϯ Great-winged Petrel P. macroptera) Gr. πτερον pteron  wing; -δρομος -dromos  -racer, -runner  < τρεχω trekhō  to run; the gadfly petrels were so named with reference to their fast weaving flight, as if pursued by horseflies; "1. FULMAREÆ.  ...  *4. Pterodroma, Bp.   14. fuliginosa, Banks. (grisea, Kuhl nec Gm.  lugens? Soland.  atlantica, Gould.)   15. macroptera, Smith.  (brevirostris, Less.)   16. aterrima, Verr.  (carbonaria? Solander.)" (Bonaparte 1856); "Pterodroma, Bp. (Thalassoica? p. Gr. - Procellaria, p. Hombr. et Jacq. - Ossifraga, p. Reich.) Rostrum brevissimum, curvum, valde compressum: cauda cuneata. Nigrae.  Cum genere BULWERIA Procellariearum analogiam praebent. Parvulae inter congeneres conveniunt quippe statura cum gigantibus illis propriae sectionis.    M. ant. pr. Afr.  3.    1. PROCELLARIA macroptera, Smith.   ...   2. PROCELLARIA FULIGINOSA, Banks, nec Lath.   ...   *3. PROCELLARIA aterrima, Verr." (Bonaparte 1857); "Pterodroma Bonaparte, Comp. Rend. Acad. Sci. Paris, 42, 1856, p. 768. Type, by subsequent designation, Procellaria macroptera A. Smith (Coues, Proc. Acad. Nat. Sci. Phila., 1866, p. 137)." (Peters 1931, I, 60).
Var. Petrodroma, Pterodrome. 
Synon. Aestrelata, Cookilaria, Hallstroma, Oestrelatella, Proaestrelata, Rhantistes.

phaeopygia / phaeopygium
Gr. φαιος phaios  dusky, brown; -πυγιος -pugios  -rumped  < πυγη pugē  rump.