Lower Cretaceous ammonites from the Neuquen Basin, Argentina: Viluceras, a new Valanginian subgenus of Olcostephanus

M. B. Aguirre-Urreta, and P. F. Rawson

1999

Article

Cretaceous Research 20:343-357

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Taxa discussed in this work:

• Olcostephanus (Olcostephanus)
• Olcostephanus (Olcostephanus) mingrammi
• Olcostephanus (Olcostephanus) minigrammi
• Olcostephanus (Viluceras)
• Olcostephanus (Viluceras) araucanus
• Olcostephanus (Viluceras) duraznoensis
• Olcostephanus (Viluceras) permolestus

Taxonomy:

• Olcostephanus (Olcostephanus) mingrammi belongs to Olcostephanus (Olcostephanus) - Aguirre-Urreta and R (1999)
• Olcostephanus (Viluceras) belongs to Ammonites (Olcostephanus) - Aguirre-Urreta and R (1999)
• Olcostephanus (Viluceras) permolestus belongs to Olcostephanus (Viluceras) - Aguirre-Urreta and R (1999)
• Olcostephanus (Viluceras) araucanus belongs to Olcostephanus (Viluceras) - Aguirre-Urreta and R (1999)
• Olcostephanus (Viluceras) duraznoensis belongs to Olcostephanus (Viluceras) - Aguirre-Urreta and R (1999)