| a new isospora sp. from carduelis tristis (aves: fringillidae) from ontario, canada. | isospora gryphoni n. sp. is described from oocysts found in the feces of the american goldfinch, carduelis tristis, from guelph, ontario, canada. the oocysts are spherical to subspherical, with a double-layered, smooth, colorless oocyst wall, 29.2 x 30.7 microm (25-33 x 28-34; n = 30) with 2-4 rice-grain-shaped polar bodies; no micropyle or residuum. sporocysts are ovoid, 22.2 x 13.4 microm (15-25 x 12-14.5; n = 30) with a small stieda body, indistinct substiedal body, and prominent sporocyst re ... | 1998 | 9488354 |