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The present study aims to clarify the confused taxonomy of    Z.   schaufussi    von Frauenfeld, 1862 and    Zospeum   suarezi    Gittenberger, 1980. Revision of Iberian    Zospeum    micro snails is severely hindered by uncertainties regarding the identity of the oldest Iberian    Zospeum    species,    Z.   schaufussi    von Frauenfeld, 1862. In this paper, we clarify its taxonomic status by designating a lectotype from the original syntype series and by describing its internal and external shell morphology. Using SEM-EDX, we attempt to identify the area of the type locality cave more precisely than “a cave in Spain”. The shell described and illustrated by  Gittenberger (1980)  as    Z.   schaufussi    appears not to be conspecific with the lectotype shell, and is considered a separate species,    Z.   gittenbergeri    Jochum, Prieto &amp; De Winter,  sp. n.Zospeum   suarezi    was described from various caves in NW Spain. Study of the type material reveals that these shells are not homogenous in shell morphology. The holotype shell of    Z.   suarezi    is imaged here for the first time. The paratype shell, illustrated by  Gittenberger (1980)  from a distant, second cave, is described as    Zospeum   praetermissum    Jochum, Prieto &amp; De Winter,  sp. n.  The shell selected here as lectotype of    Z.   schaufussi   , was also considered a paratype of    Z.   suarezi    by  Gittenberger (1980) . Since this specimen is morphologically very similar to topotypic shells of    Z.   suarezi   , the latter species is considered a junior synonym of    Z.   schaufussi    ( syn. n. ). The internal shell morphology of all these taxa is described and illustrated using X-ray Micro Computer Tomography ( Micro-CT ).

zookeys

Re-evaluation of    Zospeum   schaufussi    von Frauenfeld, 1862 and    Z.   suarezi    Gittenberger, 1980, including the description of two new Iberian species using Computer Tomography (CT) (  Eupulmonata  ,   Ellobioidea  ,   Carychiidae  )