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Crotalocephalus Gibbus Trilobite 38mm


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Crotalocephalus Gibbus Trilobite 38mm. The extinct genera were bottom dwellers, foraging into the silts for organic nutrients to devour, having a hypostome, a mouth cover which is sometimes found complete under the forward doublure, near the chin end of the trilobites exoskeleton or carapace. This acted as a type of shovel element scooping up a tracked of the sea bed allowing the arthropod to filter through in a continual search for organic food, possibly soft marine animals and body parts or annelid worms. Its small holochroal eyes possibly of limited use in a wider search, suitable only for the constant lookout of bigger predators. Holochroal eyes have many biconvex lenses beneath a single cornea membrane, the cornea covers all of the lenses which are normally hexagonal and can number up to several thousand lenses per eye.

Genus: Crotalocephalus Gibbus. (Crotalocephalina).
Age: Palaeozoic era, Early Devonian period, Pragian stage 411 to 408 million years ago.
Origin: Hamar Laghdad formation, Djebel Issoumour, Alnif, Morocco, North Africa.

Crotalocephalus Gibbus measurements.
Height: 3.3 cm
Width: 3.8 cm
Depth: 2 cm

Overall measurements.
Height: 4.4 cm
Width: 3.8 cm
Depth: 3 cm

Approximate weight: 40 g

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Crotalocephalina Crotalocephalus gibbus trilobite 38mm, A fine fossilised trilobite arthropod Originating from North Africa, dating back to the Palaeozoic era, Early Devonian period, Pragian stage 411 to 408 million years ago. The order and type of this Devonian trilobite. Order of Phylum Arthropoda, Class trilobita Order Phacopida, Cheiruridae (SALTER, 1864 Phacopida Cheirurina), Super family Cheiruroidea Family Cheiruridae, Genus Crotalocephalina (Crotalocephalus) gibbus Beyrich, c1845.

The very distinct genus type of Crotalocephalus. This genus type has evolved with deep furrows criss crossing the glabella, with small protruding bulbous eyes and a nose which to the author appears like some great head of a sperm whale. The long fine thoracic segments terminating with spine like appendages now worked out of the matrix and completely free as if swimming in the ancient Devonian seas still. The pygidium spines complete as are the two spine points attached to either side of the glabella cheek shield, all these attributes making for a dynamic display. Each delicate part of the trilobites exoskeleton clearly visible in the exotic stance. Particularly good are the the thoracic terminal segments, overall a very well preserved fossilised carapace.

The Crotalocephalina Crotalocephalus gibbus trilobite professionally prepared revealing it from the rock of the fossil bed, natural contemporaneous Devonian limestone this fossil silt may have been the individuals demise, it is believed underwater landslips caused many trilobites to be suddenly covered over and trapped victims in an anoxic environment, lack of oxygen environment is beneficial for the process of quickly and successful fossilisation, aiding petrification and retarding bacterial growth.

Our Devonian trilobites are collected in the field by our associates in North Africa and prepared by technicians in the Moroccan fossil Lab. We therefore have a historical link to our fossil diggers and our specimens enabling us to authenticate and guarantee all our trilobites. We often travel fossil bed location far afield to collect directly from the fossil diggers, technicians or merchants in foreign quarters, this is how this particular fossil trilobite came to us. We feel we sometimes are required to step outside of our close team to secure specimens which have merit and this trilobite is one of those occasions when it was necessary to do just that. Secured in the Western Sahara.

Additional Information

Age No
Origin Morocco
Colour Black