Ascarosepion
Ascarosepion is a genus of parasitic nematodes that are found in marine fish. This genus contains only one species, Ascarosepion viviparum, which is unique in its ability to give birth to live young instead of laying eggs, a characteristic not typically observed in other parasitic nematodes. It is known to infect various fish species in the family Scorpaenidae, commonly referred to as scorpionfish.
Common Names
There are no commonly used names for Ascarosepion or Ascarosepion viviparum.
Characteristics
Ascarosepion viviparum is a relatively small nematode, typically measuring around 2-3 cm in length. Its most distinctive feature is its viviparous reproductive strategy, meaning it gives birth to live young instead of laying eggs. This adaptation allows for the direct transfer of larvae into the host's bloodstream, ensuring a high survival rate.
The parasite exhibits sexual dimorphism, with the male being smaller than the female and possessing a curled tail. The female, in contrast, has a long, slender body with a distinct vulva located in the anterior region.
Environment
Ascarosepion viviparum is exclusively found in marine environments, primarily infecting scorpionfish (family Scorpaenidae). The parasite's life cycle is complex and involves multiple stages, including free-living larvae that infect their host through ingestion of contaminated food.
The parasite's geographic distribution is limited to the Mediterranean Sea and the northeastern Atlantic Ocean. It is found in a range of depths, but its prevalence is higher in shallower waters.
References
Further information and scientific literature can be found through these links: