Fossil Record 16 (1) 2013, 5–65 / DOI 10.1002/mmng.201300001 Late Givetian ammonoids from Hassi Nebech (Tafilalt Basin, Anti-Atlas, southern Morocco) Jrgen Bockwinkel1, R. Thomas Becker*,2 and y Volker Ebbighausen3 1 Dechant-Fein-Str. 22, 51375 Leverkusen, Germany. E-mail:
[email protected] 2 Institut fr Geologie und Palontologie, WWU Mnster, Corrensstr. 24, 48149 Mnster, Germany. E-mail:
[email protected] 3 deceased on 3rd June 2011 Abstract Received 7 January 2012 The Hassi Nebech area of the SE Tafilalt (Tafilalt Basin, Anti-Atlas, Morocco) yielded Accepted 3 September 2012 the richest and most diverse late Givetian ammonoid fauna on a global scale. Above the Published 20 February 2013 distinctive regional “Lower Marker Bed” (Synpharciceras clavilobum Zone), abundant loosely collected limonitic specimens derive from hypoxic shales of the Taouzites taou- zensis 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., Darkao- ceras 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: Syn- pharciceras 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 in- traspecific variability necessitates a revised diagnosis for ten taxa.