A novelEimeriaSchneider, 1875 species is described from an Australian pied oystercatcherHaematopus longirostrisVieillot, in Western Australia. The pied oystercatcher was admitted to the Kanyana Wildlife Rehabilitation Centre (KWRC), Perth, Western Australia in a poor body condition, abrasion to its right hock and signs of partial delamination to its lower beak. Investigation into potential medical causes resulted in a faecal sample being collected and screened for gastrointestinal parasites. Unsporulated coccidian oocysts were initially observed in the faeces and identified asEimeriaupon sporulation. The sporulated oocysts (n= 20) are ellipsoidal, 20-21 × 12-13 μm in shape and have thick bi-layered walls which are c.2/3 of the total thickness. Micropyle is present, robust and protruding, and occasionally has a rounded polar body attached to the micropyle. Within the oocyst, a residuum, in addition, two to five polar granules are present. There are four ellipsoidal sporocysts 9-11×5-6 μm with flattened to half-moon shaped Stieda bodies. Sub-Stieda body and para-Stieda body are absent. The sporocysts contain sporocyst residuums composed of a few spherules scattered among the sporozoites. Within the sporozoites, anterior and posterior refractile bodies are present, but the nucleus is indiscernible. To further characterise the novelEimeriaspeciesfromH. longirostris, molecular analysis was conducted at the 18S ribosomal RNA locus, using PCR amplification and cloning. Two cloned sequences from the novelEimeriawere compared with those from otherEimeriaspp. with the highest genetic similarity of 97.6% and 97.2% from Clone 1 and 2, respectively withEimeria reichenowi(AB544308) from a hooded crane (Grus monachaTemminck) in Japan. Both sequences grouped in a clade with theEimeriaspp. isolated from wetland birds, which includeEimeria paludosa(KJ767187) from a dusky moorhen (Gallinula tenebrosaGould) in Western Australia,Eimeria reichenowi(AB544308) and Eimeria gruis (AB544336) both from hooded cranes. Based on the morphological and molecular data, thisEimeriasp. is a new species of coccidian parasite and is named Eimeria haematopusi n. sp. after its hostH. longirostris.