Donald W. Duszynski Robert N. Fisher Chris T. McAllister 2013 Between September and October 1991 and again during September 1992, skinks (<i>Emoia</i> spp.) were collected from various localities on Fiji and Papua New Guinea (PNG) and examined for coccidians. One of 4 (25%) De Vis' emo skinks (<i>Emoia pallidiceps</i>) from PNG harbored an undescribed species of <i>Isospora</i> in its feces. Oocysts of <i>Isospora grinbikpelapalai</i> n. sp. were ellipsoidal to subspheroidal, 18.1 × 14.9 (17–20 × 14–16) μm, with a bilayered wall and a length/width index (L/W) of 1.2. Both micropyle and oocyst residuum were absent, but a prominent polar granule was present. Sporocysts were ovoidal, 10.7 × 7.6 (10–11 × 7–8) μm, with a L/W index of 1.4. Stieda and sub-Stieda bodies were present, but para-Stieda bodies were absent. The sporocyst residuum consisted of large scattered globules dispersed between sporozoites. Sporozoites were elongate with spheroidal anterior and posterior refractile bodies. <i>Isospora grinbikpelapalai</i> was also found in 1 of 2 (50%) Pope's emo skinks (<i>Emoia popei</i>) from PNG. One of 13 (8%) white-bellied copper-striped skinks (<i>Emoia cyanura</i>), from Fiji, was passing another undescribed species of <i>Isospora</i> in its feces. Oocysts of <i>Isospora casei</i> n. sp. were elongate, 31.8 × 21.3 (28–35 × 18–24) μm, with a bilayered wall and a L/W index of 1.5. Micropyle, oocyst residuum, and polar granule were all absent. Sporocysts were ovoidal, 15.3 × 10.6 (14–16 × 10–12) μm, with a L/W index of 1.4. Stieda and sub-Stieda bodies were present, but para-Stieda bodies were absent. The sporocyst residuum consisted of scattered globules among sporozoites or as a cluster surrounding sporozoites. Sporozoites were elongate with spheroidal anterior and posterior refractile bodies. <i>Isospora casei</i> was also found in 1 of 2 (50%) Fiji slender treeskinks (<i>Emoia concolor</i>) from Fiji. This represents the first report of coccidia from <i>Emoia</i> spp. and, to our knowledge, the initial documentation of reptilian coccidia from herpetofauna from Papua New Guinea. application/pdf 10.1645/12-171.1 en American Society of Parasitologists Two new species of <i>Isospora</i> (Apicomplexa: Eimeriidae) from skinks <i>Emoia</i> spp. (Sauria: Scincidae), from Fiji and Papua New Guinea article