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Diacalymene Trilobite Fossil – Split Nodule with Positive/Negative, Upper Ordovician Morocco
Diacalymene Trilobite Fossil – Split Nodule with Positive/Negative, Upper Ordovician Morocco - Image 2

Diacalymene Trilobite Fossil – Split Nodule with Positive/Negative, Upper Ordovician Morocco

Original price was: £42.00.Current price is: £37.80.

A highly collectible and visually complete Diacalymene trilobite fossil preserved as a classic split nodule, displaying both the positive and negative impressions. This specimen comes from the Ktaoua Group of the Upper Ordovician period, discovered in the fossil-rich Anti-Atlas Mountains of Morocco.

Diacalymene is a well-known genus of trilobites in the order Phacopida, family Calymenidae, recognised by its semi-circular cephalon (head), distinct axial lobes, and segmental thorax. These trilobites thrived in marine environments during the Ordovician and are often found in compact nodular limestone concretions that split cleanly in half.

Fossil Type: Trilobite (extinct marine arthropod)

Genus: Diacalymene

Geological Age: Upper Ordovician (~450 million years ago)

Formation: Ktaoua Group, Anti-Atlas Region, Morocco

Depositional Environment: The Ktaoua Group represents a shallow marine platform rich in calcareous sediments. Trilobites were preserved in nodules that formed within these sediments under low-energy, anoxic bottom conditions that enabled rapid fossilisation.

Morphological Features:

  • Fully articulated trilobite in natural enrolment or prone position
  • Cephalon, thorax, and pygidium clearly visible
  • Clean split nodule with positive and negative halves
  • Fine preservation of exoskeletal detail

Notable:

  • Excellent example of a nodular trilobite fossil
  • Ideal for collectors, educational use, and display
  • Exact specimen shown in the photo is the one for sale

Authenticity: All of our fossils are 100% genuine natural specimens and include a Certificate of Authenticity. Please refer to the image for exact sizing – the scale cube shown equals 1cm.

 

This Diacalymene trilobite fossil nodule from the Anti-Atlas Mountains provides a striking and scientifically valuable insight into marine life of the Ordovician seas—an essential addition for any fossil collection.

(Actual as seen)

Only 1 left in stock

SKU: UF3678 Category:

Description

A highly collectible and visually complete Diacalymene trilobite fossil preserved as a classic split nodule, displaying both the positive and negative impressions. This specimen comes from the Ktaoua Group of the Upper Ordovician period, discovered in the fossil-rich Anti-Atlas Mountains of Morocco.

Diacalymene is a well-known genus of trilobites in the order Phacopida, family Calymenidae, recognised by its semi-circular cephalon (head), distinct axial lobes, and segmental thorax. These trilobites thrived in marine environments during the Ordovician and are often found in compact nodular limestone concretions that split cleanly in half.

Fossil Type: Trilobite (extinct marine arthropod)

Genus: Diacalymene

Geological Age: Upper Ordovician (~450 million years ago)

Formation: Ktaoua Group, Anti-Atlas Region, Morocco

Depositional Environment: The Ktaoua Group represents a shallow marine platform rich in calcareous sediments. Trilobites were preserved in nodules that formed within these sediments under low-energy, anoxic bottom conditions that enabled rapid fossilisation.

Morphological Features:

  • Fully articulated trilobite in natural enrolment or prone position
  • Cephalon, thorax, and pygidium clearly visible
  • Clean split nodule with positive and negative halves
  • Fine preservation of exoskeletal detail

Notable:

  • Excellent example of a nodular trilobite fossil
  • Ideal for collectors, educational use, and display
  • Exact specimen shown in the photo is the one for sale

Authenticity: All of our fossils are 100% genuine natural specimens and include a Certificate of Authenticity. Please refer to the image for exact sizing – the scale cube shown equals 1cm.

 

This Diacalymene trilobite fossil nodule from the Anti-Atlas Mountains provides a striking and scientifically valuable insight into marine life of the Ordovician seas—an essential addition for any fossil collection.

Additional information

Era

Ordovician
Origin

Morocco

Ordovician Information

The Ordovician Period (485–443 million years ago) was a time of marine expansion and biodiversity growth, following the Cambrian Explosion. Warm, shallow seas covered much of the continents, supporting trilobites, brachiopods, corals, and the first true reefs. Jawless fish (early vertebrates) diversified, and the first sea scorpions (eurypterids) became dominant predators. On land, the first primitive plants (moss-like bryophytes) began colonizing damp environments. The climate was initially warm, but by the late Ordovician, a major ice age caused a drastic drop in sea levels, triggering the Ordovician-Silurian mass extinction, which wiped out nearly 85% of marine species. Despite this, the period laid the foundation for the rise of more complex ecosystems in the Silurian.

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