Two new species ofSyphacia(Nematoda: Oxyuridae) in endemic murid rodents from Sulawesi, Indonesia

Abstract

AbstractTwo new species ofSyphacia(Nematoda: Oxyuridae) are described from endemic murids of Sulawesi, Indonesia:Syphacia(Syphacia)taeromyossp. n. andS.(S.)paruromyossp. n. parasitic in the caecum ofTaeromys celebensisandParuromys dominator, respectively. They are readily distinguished from all of the congeners recorded from Indonesia–Australian regions by having a round cephalic plate, vesicular lateral alae in the male, posteriorly positioned excretory pore in the male, and/or lacking cervical alae.Syphacia (S.) paruromyosdiffers fromS. (S.) taeromyosby having a whip-like tail appendage in the male, longer relative distance between excretory pore and vulva, and larger eggs. The round cephalic plate in both sexes and developed vesicular lateral alae in the male are morphological traits common in endemicSyphaciaspecies hitherto known from Sulawesi murids, suggesting that they have derived from a common ancestor and evolved with their hosts in the isolated insular environment.