A new species of plerocercoid larval trypanorhynch cestode, Nybelinia sp. is recorded from red mullet fishes Mullus barbatus belonging to family Mullidae that were collected from the Red Sea, Suez Governorate, Egypt. This larva was isolated from body cavity and external stomach wall. By using scanning electron microscope, this plerocercoid larva is characterized by subcylindrical scolex, four elongated bothridia with deep grooves, tentacular armature is homeoacanthous, homeomorphous and there are a muscular rings around the basal parts of tentacles. For the first time, the bothridial pits are described in a species of genus Nybelinia, so that this structure is considered a characteristic feature of the present new species. In addition to, three kinds of microtriches are detected on the surface of present Nybelinia sp., filamentous, spiniform and bifurcate hook-like microtriches. Concerning to the transmission electron microscopy revealed that the distal cytoplasm of the tegument is thick, rich in discoid electron-lucent vesicles and mitochondria. The basal matrix is poorly developed and the basal region under the musculature layer possess many large spherical electron-dense vesicles. The fibrils of the wall of tentacles are arranged in discrete blocks of parallel fibrils. The bulb musculature consists of layers of striated muscles are arranged into discrete blocks of myofibrils.

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