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This study presents new insights in the anatomy of genital organs of some large helicid gastropods from northern Africa. The genetic analysis with the markers  COI ,  16S ,  H3 , and 5.8 S rRNA+ITS2 reveales a high support for    Alabastrina    and    Otala    as separate evolutionary lineages within the   Otalini  . The position of    Siretia    as another separate lineage within the   Otalini   is discussed. “   Tingitana   minettei   decussata   ” clusters within the    O.   xanthodon    clade and confirms that the genus    Tingitana    can be synonymised with    Otala   . The genus    Alabastrina    differs from all other known genera by possession of a penial appendix. This character state is also found in topotypic    A.   tistutensis   . Examination of the twin penial papilla system in    Otala    recovers a reduction of the proximal penial papilla in    O.   punctata   . The position of    Helix   murcica    as a separate subspecies of    O.   lactea    is not supported, and it is here considered to be a synonym of the latter species.

zookeys

Anatomical and phylogenetic investigation of the genera    Alabastrina    Kobelt, 1904,    Siretia    Pallary, 1926, and    Otala    Schumacher, 1817 (  Stylommatophora  ,   Helicidae  )