2 NEW ISOSPORAN PARASITES (APICOMPLEXA, EIMERIIDAE) FROM THE SOUTH-AMERICAN WOODCREEPER DENDROCOLAPTES-CERTHIA

Two new species of Isospora are reported in the faecal contents of the barred woodcreeper, Dendrocolaptes certhia from Ecuador. Oocysts of I sospora magna sp. n. are reported from 1/4 barred woodcreepers. Sporul ated oocysts are ovoidal, 29.7 x 24.9 (26-31 x 23-26) mu m, with a smo oth, colorless, bilayered wall; average shape index is 1.20. No microp yle or oocyst residuum are present, but the oocyst contains 1 large, r ough polar granule. Sporocysts are ovoidal, 15.8 x 12.6 (15-20 x 11-14 ) mu m; average shape index is 1.28 with a smooth, single layered wall . The Stieda body is broad dome-like and the substieda body is inconsp icuous, with a wavy lower surface and located directly below and sligh tly to the side of the sporocyst vertical axis. Each sporocyst contain s a residuum of fine, uniform granules in a consolidated, lobate clust er. Sporozoites are sausage-shaped with an ovoid, posterior, refractil e body, a slightly smaller anterior, refractile body; nucleus is spher ical, less distinct and centrally located. Isospora concentrica sp. n. is reported from 3/6 barred woodcreepers. Sporulated oocysts are ovoi dal, 26.6 x 22.7 (24-30 x 21-25) mu m, colorless, with a smooth bilaye red wall; shape index is 1.2. No micropyle or oocyst residuum are pres ent, but the oocyst contains a single, ovoid polar body or occasionall y 2 polar bodies. Sporocysts are ovoidal to ellipsoidal, 17.2 x 11 (15 -18 x 9-12) mu m, with a squared or block-shaped Stieda body and an ov oidal or bubble-shaped substieda body located beneath the Stieda body, usually to the left or right of the sporocyst vertical axis; shape in dex is 1.6. Sporocyst residuum is compact, usually slightly ovoid and composed of uniform, fine granules. Sporozoites are vermiform and appe ar randomly arranged in the sporocysts with a round posterior refracti le body, a large circular nucleus and the anterior part marked with co ncentric lines.