Three New Coccidia (Apicomplexa) from the Hood Island Lizard, Tropidurus delanonis, from the Galápagos Archipelago

Fecal samples of 14 Conolophus subcristatus from Isla Plaza Sur and of 24 Tropidurus delanonis from Isla Espafiola and several satellite islets, Galapagos Islands, Ecuador, collected during June and July 1987 were examined for coccidian oocysts. None of the samples from C. subcristatus contained oocysts, but 11 of 24 (46%) samples from T. delanonis had oocysts when examined. Two Eimeria and 1 Isospora spp. were present, which we describe here as new species. Sporulated oocysts of Eimeria tropidura n. sp. are ellipsoidal, 32.5 x 23.8 (21-38 x 19-30) im, with spheroidal to subspheroidal sporocysts, 8.2 x 7.9 (7-10 x 5-10) ,m. Sporulated oocysts of Eimeria galapagoensis n. sp. are cylindroidal, 32.8 x 14.0 (27-36 x 12-17) Am, with spheroidal sporocysts 7.5 (7.5) Aim. Sporulated oocysts of Isospora insularius n. sp. are spheroidal to subspheroidal, 24.5 x 22.3 (19-30 x 18-27) ,im, with lemon-shaped sporocysts, 16.6 x 9.3 (9-17 x 7-13) gm. Each of the 11 positive fecal samples had oocysts of only 1 coccidian species, i.e., the different coccidian species did not share individual hosts. During June and July 1987, we had the opportunity to collect fresh fecal samples from 2 species of Galapagos lizards, Conolophus subcristatus and Tropidurus delanonis. A number of the T. delanonis examined were passing coccidian oocysts that, upon closer study, represented 3 species, an isosporan and 2 eimerians that we describe here as new. MATERIALS AND METHODS During June 1987, we collected fresh fecal samples from 14 C. subcristatus from Isla Plaza Sur, and during July 1987, fresh samples were taken from 24 T. delanonis from Isla Espanola (5), Isla Gardner por Espafiola (8), Islote Osbom (7), and an unnamed islet (4) in Gardner Bay, the Galipagos Islands, Ecuador. All hosts were live-captured and fecal samples collected were placed in 2% (w/v) aqueous potassium dichromate (K2Cr207) and kept at ambient temperature. Once the samples were brought to Albuquerque in late July 1987, we followed the procedures outlined by AquinoShuster and Duszynski (1989) for storing, processing, measuring, and photographing oocysts. All measurements are in ,m with ranges in parentheses following the means. As the Galapagos Islands constitute a national park, it was not possible to keep the hosts; thus, after collecting feces from hosts, each was released.