A new record of the occurrence of Trichuris skrjabini Baskakov, 1924 in goats of Pakistan.

More than 23 Trichuroidea species have been identified in ruminants in different parts of the world. Most are pathogenic, causing trichurosis. Trichuris adults of most species within this family have a predilection for the ceca, where they may cause damage to the epithelial wall. In the present study, Trichuris spp. from large intestine of goats were analysed based on morphological and molecular characteristics. Fifty adult worms (male = 25 and female = 25) were selected for morphometric and molecular analysis. Male Trichuris were distinguished by their longer spicules, typical spicule sheaths, and small spicules that were always completely covered by the spicule sheath. The presence of an uneverted vulva in the vagina distinguished female worms. We have performed the molecular characterisation of adult warms to identify as Trichuris skrjabini. Genetic comparison of T. skrjabini rDNA ITS2 sequences with those from other Trichuris spp. was performed to assess within and between species variation and validate the use of ITS-2 rDNA as a robust species-specific marker for T. skrjabini identification. This work provides the first report of this parasite species from Pakistan and validated species-specific marker of T. skrjabini that reduces the production potential of goats in the country.