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The microthrix pattern of common forms of the trypanorhynch cestode  Prochristianella clarkeae  Beveridge, 1990  on which the microscopically visible microtriches almost extended to the posterior end of the scolex was described using SEM and compared to other forms for which this pattern was different. The proximal bothrial surface and the scolex peduncle of all the examined specimens were covered with palmate spinitriches and papilliform filitriches. Unlike the common specimens of  P. clarkeae , on the surface of those specimens with unusual distributions of microtriches as well as those on which the microscopically visible microtriches were not observable, palmate spinitriches extended to the mid-pars vaginalis and not to the posterior end of the scolex. Statistical tests did not detect any significant difference in the measurements of the specimens possessing different microthrix patterns. Furthermore, the partial 28S rDNA confirmed that the different forms were conspecific and that  P. clarkeae  possesses an intraspecific variation in the distribution of palmate spinitriches.  Pastinachus sephen  as a new host record was also established for  Prochristianella clarkeae  reported for the first time from the Persian Gulf.

acta parasitologica

Prochristianella clarkeae  Beveridge, 1990 (Eutetrarhynchidae): a species complex or a species with intraspecific variation in the distribution of its tegumental microtriches?