ACRIOCERAS TABRELLI Heteromorph Ammonite – Lower Hauterivian Cretaceous, Morocco

Description

For sale is an authentic and scientifically valuable heteromorph ammonite fossil, ACRIOCERAS TABRELLI, originating from the Lower Hauterivian Stage of the Early Cretaceous Period. This striking fossil was discovered in Morocco, a region renowned for its diverse and well-preserved ammonite fauna.

Taxonomic Classification:

• Order: Ammonitida
• Superfamily: Ancyloceratoidea
• Family: Acrioceratidae
• Genus & Species: Acrioceras tabrelli

Geological Context:

• Period: Cretaceous
• Stage: Lower Hauterivian (~132–130 million years ago)
• Depositional Environment: Marine outer shelf to slope setting. Fine carbonate sediments accumulated in low-energy, open marine environments, allowing the preservation of delicate ammonite forms like Acrioceras. These ammonites likely lived in mid-water zones and were adapted for a planktonic or weakly nektonic lifestyle.

Morphological Features:

• Classic heteromorph structure with open helicoidal coiling, gradually transitioning into more linear, curved shaft sections
• Strong ribbing and nodose ornamentation, with complex suture lines on well-preserved specimens
• Irregular coiling and spacing are considered evolutionary adaptations that may have affected buoyancy and mobility

Scientific Notes:

• Acrioceras tabrelli is a key index species for biostratigraphy in Lower Hauterivian sequences, particularly within the Tethyan domain
• These ammonites showcase the diversity of heteromorph evolution, breaking from traditional planispiral coiling typical of earlier ammonite groups

Locality Information:

• Morocco – Cretaceous fossil-bearing formations here are globally recognized for their exceptional ammonite assemblages, often preserved in detail due to minimal tectonic disturbance and fine marine sedimentation.

Authenticity & Display:

All of our fossils are 100% Genuine Specimens and are provided with a Certificate of Authenticity. The images show the actual fossil you will receive. Please refer to the included photo for full measurements—scale rule cube = 1cm.

This is a carefully selected specimen of Acrioceras tabrelli, chosen for its clarity of structure and scientific importance. Ideal for collectors of heteromorph ammonites, palaeontology enthusiasts, or educational institutions.

Own a genuine relic from over 130 million years ago—an excellent addition to any fossil collection or natural history display.