A sample from the holotype population of the limno‐terrestrial eutardigradeRamazzoltius varieornatuswas examined in order to elucidate the variation occurring in the size of the sclerified structures of the pharyngeal apparatus. A frequency plot of body lengths was also produced to deduce the effectiveness of this technique in estimating the number of moults exhibited by this species. Problems associated with collecting and using morphometric data in this way are discussed. Additional ultrastructural information associated with moulting is also presented. New species within the genus may be difficult to recognize in the absence of adequate data related to intraspecific variatio