Goussia platichthyus sp. n. (Sporozoa, Coccidia) from the Flounder Platichthys flesus (L.) (Pisces: Pleuronectidae)

Abstract. Faeces from five fish caught in the delta of the Neman River (Courish Lagoon) in July through August 2000 were examined. A new species of the genus Goussia found in one of these fish is described in the paper. Oocysts irregular in shape, 30-35 x 27.5-30 μm with a membrane-like wall without oocyst residuum, sporocysts 15-20 x 10-12.5 μm are densely covered with oocyst’s wall or they lie freely in the oocyst, without Stieda body, sporocyst residuum formed by four or six granules. Sporogony: endogenous.