Description
This listing features a finely preserved trilobite fossil of the genus Diacalymene, preserved as a positive and negative split nodule from the Ktaoua Group, located in the Anti-Atlas Region of Morocco. This authentic fossil dates to the Upper Ordovician Period and comes with a Certificate of Authenticity. The photo displays the actual specimen you will receive.
Diacalymene trilobites are well-known from Upper Ordovician marine deposits in North Africa and represent a genus within the:
- Order: Phacopida
- Family: Calymenidae
The Ktaoua Group consists of siliciclastic marine sediments, deposited in a shallow epicontinental sea during the Katian Stage of the Upper Ordovician (~450 million years ago). The nodular preservation is a result of early diagenetic concretion formation, which encased and preserved the trilobite within fine marine silts and muds.
Morphological Features:
- Elongated, semi-oval cephalon (head)
- Thorax with well-defined axial lobes and pleurae (segments)
- Rounded pygidium (tail) with detailed segmentation
- Fossil preserved in both the convex (positive) and concave (negative) halves of the nodule
Diacalymene is appreciated for its symmetrical body plan, high-quality preservation, and complete three-part segmentation, making it a great teaching and display specimen.
Specimen Details:
- Genus: Diacalymene (likely Diacalymene ouzregui)
- Fossil Type: Trilobite (positive and negative halves in nodule)
- Geological Formation: Ktaoua Group
- Geological Age: Upper Ordovician (Katian Stage)
- Location: Anti-Atlas Region, Morocco
- Depositional Environment: Shallow marine siliciclastic basin
- Order: Phacopida
- Family: Calymenidae
This fossil is ideal for collectors, students, and educators looking to own a complete and naturally preserved trilobite fossil from a globally renowned fossil site.
Scale rule squares/cube = 1cm. Please refer to the image for full sizing.
All of our Fossils are 100% Genuine Specimens & come with a Certificate of Authenticity.
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