Isospora gallicolumbae sp. n. from Beccari's ground dove (Gallicolumba beccarii Salvadori) in Papua New Guinea.

Isospora gallicolumbae sp. n. is described from Beccari's ground dove, Gallicolumba beccarii Salvadori, in Papua New Guinea. The ellipsoidal oocysts average 16.0 times 20.0 micron. The oocyst wall is light green, single-layered (approximately 0.8 micron), and becomes distorted within 10 min in sugar solution. Micropyle and oocyst residuum are absent; one polar granule is present. Sporocysts are ovoid, 8.0 times 12.0 micron, with prominent conical Stieda body. Sporocyst residuum is a spherical mass (approximately 5.0 micron) of lighter and darker granules. This is the first species of Isospora reported from a host in the avian order Columbiformes.