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The Hassi Nebech area of the SE Tafilalt (Tafilalt Basin, Anti-Atlas, Morocco) yielded the richest and most diverse late Givetian ammonoid fauna on a global scale. Above the distinctive regional "Lower Marker Bed" ( Synpharciceras clavilobum  Zone), abundant loosely collected limonitic specimens derive from hypoxic shales of the  Taouzites taouzensis  to  Petteroceras errans  zones. The ontogenetic morphometry and intraspecific variability of a total of 30 species representing five families, the Acanthoclymeniidae, Taouzitidae, Pharciceratidae, Petteroceratidae, and Tornoceratidae, are documented. New taxa are:  Pseudoprobeloceras praecox  n. sp.,  Scaturites minutus  n. gen. n. sp.,  Darkaoceras velox  n. sp.,  Pharciceras decoratum  n. sp.,  Ph. fornix  n. sp.,  Ph. subconstans  n. sp.,  Ph. involutum  n. sp.,  Lunupharciceras incisum  n. sp.,  Transpharciceras procedens  n. gen. n. sp.,  Stenopharciceras progressum  n. sp.,  Pluripharciceras  n. gen. (type species:  Synpharciceras plurilobatum  Petter, 1959),  Plu. orbis  n. sp.,  Synpharciceras frequens  n. sp.,  Lobotornoceras bensaidi  n. sp.,  Nebechoceras eccentricum  n. gen. n. sp., and  Phoenixites lenticulus  n. sp. The documentation of conch and particularly suture ontogeny and intraspecific variability necessitates a revised diagnosis for ten taxa.  Manticoceras pontiformis  Termier &amp; Termier, 1950,  Probeloceras costulatum  Petter, 1959, and  Pseudoprobeloceras nebechense  Bensaïd, 1974 are regarded as subjective junior synonyms of  Ps. pernai  (Wedekind, 1918).  Sandbergeroceras acutum  Termier &amp; Termier, 1950 is a subjective synonym of  Taouzites taouzensis  (Termier &amp; Termier, 1950).  Pharciceras applanatum  Bensaïd, 1974 is transferred to  Extropharciceras . Other forms ( Ph . aff.  tridens ,  Ph . cf.  subconstans  n. sp.,  Extropharciceras  n. sp. 2,  Ex . cf.  arenicum ,  Ex . cf.  applanatum ,  Synpharciceras  sp.,  Plu . cf.  plurilobatum ) are described in open nomenclature.    doi: 10.1002/mmng.201300001

Late Givetian ammonoids from Hassi Nebech (Tafilalt Basin, Anti-Atlas, southern Morocco)