Scanning electron microscopy of Boreostrongylus seurati (Nematoda: Heligmosomidae) from the Egyptian desert gerbil Gerbillus gerbillus with notes on its phylogeny.

A heligmosomid nematode Boreostrongylus seurati, belonging to the subfamily Nippostrongylinae, is described and figured based on specimens collected from duodenum of Egyptian gerbil Gerbillus gerbillus (Olivier) collected in Giza and Sinai Peninsula, Egypt. Both light and scanning electron microscopy were used to describe adult worms and their bursa and the synlophe. The ultrastructural morphology of some features of the worms is also described including mouth opening, cuticular surface, spicules, cephalic and bursal papillae.