Early late Viséan ammonoid assemblages in Morocco are composed of diverse and well-preserved specimens. The material
was found in a plain in the Tafilalt (eastern Anti-Atlas). Here, we describe mass-occurrences of juvenile specimens,
in which subadult and adult specimens occur in low numbers. The juveniles of some species display a conch morphology
that differs fundamentally from the adult stages. Accordingly, we emend the species diagnoses of Goniatites lazarus as
well as Calygirtyoceras darkaouaense, introduce the species Entogonites bucheri sp. nov., and discuss possible ecological
implications of the morphologic changes throughout ontogeny. In particular, we compare the changes in conch
morphology through ontogeny in the light of Pareto Optimiality according to which the morphology of organisms would
fill a polygon or polyhedron in morphospace. Data points in one of the vorteces of the polyhedron indicate optimisation
for the corresponding task. Although shape is not a proof of function, it appears plausible that juvenile conchs were
selected rather for compactness while adult conchs were positively selected for conchs with improved hydrodynamic
properties. This appears plausible because at small conch diameters, swimming movements will not suffice for effective
translocation and a planktonic mode of life is likely.
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