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Walliserops Hammi Chatterton Trilobite 61mm


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An order of Phacopida this Walliserops Hammi trilobite is a fine professionally cleaned and conserved arthropod fossil from the Devonian of Morocco. The natural fossil exoskeleton, the carapace, prepared in a professional Laboratory, revealing the wonderfully preserved remains of an exceptional and ancient arthropod. Seemingly prone in a defensive mode over the limestone matrix which once encased it, the limestone tomb was probably the result of a rapid smothering of silt from an underwater disturbance of some magnitude.

Genus: Walliserops Hammi (described by Chatterton)
Age: Palaeozoic era, Devonian 417 to 354 million years ago.
Origin: Emsian, Timrhanrhart Formation, Foum Zguid, Morocco, North Africa.

Walliserops Trifurcatus matrix measurements.
Length: 8.5 cm
Width: 7.3 cm

Walliserops Trifurcatus measurements.
Length actual prone: 6.1 cm
Length directly: 5.5 cm
Height: 2.2 cm
Width: 3.0 cm

Overall weight: 300 g Approximately

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Walliserops Hammi (described by Chatterton et al.) the spinous, phacopid (acastid) trilobite, cleaned and conserved, the overburden of solid limestone rock removed, the trilobite cleaned with an air-abrasive technique and so in this way of extensive preparation work the once extant arthropod which has been brought back from the past in a still life pose over the fossil seabed layer. Exhibiting the familiar morphology of the once animate carapace, the distinctive feature of this genus is of the trilobites is the three-prong nose spike. The pronged trident or fork-like structure erupting forth from the glabella (head shield) and as yet the appendage has no known use. It may have a sensory, sexual or defensive purpose, this smaller appendage similar to the longer extended trident of the Walliserops trifurcatus trilobite also found in the same fossil bed, could be a difference of sexual dimorphism, one being the female to its counterpart male asteropygid trilobite. Perhaps this may be the female, where as like a stag beetle the longer trifurcatus may have been the male. The thoracic segments are determinable, and the pygidium (tail) is intact. With excellent multi compound eye lenses distinct and discernable by the naked eye, both eye columns once more topped with a defensive spine.

Condition report: The carapace has been wonderfully exposed using the latest techniques to a very high standard. Through the series of images above, the darker carapace most appealing characteristic of the specimen. The close-up images and our cursor magnification reveal the nuances of the carapace, its undulations, texture and colour tones which have been polished by the air abrasive technique, again most attractive. The specimen has been coated with a protective verni (fossil varnish) which creates a dark tone to the quite naturally occuring colour of the exoskeleton. the profusely spinous individual is of a top calibre trilobite specimen, a superb fossil, superbly conserved.

Trident Walliserops Trifurcatus. The amazing trident, could it be a sensory organ or sexual display appendage, the exact use is not determined as yet. However the very long and pronged tridentate emanating from the head makes this little arthropod unique in its clade. Found in the Palaeozoic era, Devonian period 417 to 354 million years ago specifically, excavated from a stratum of limestone of the Emsian stage around 407 to 393 million years ago, the location of the find is Timrhanrhart Formation, Foum Zguid, Morocco, North Africa.

Delivered in a attractive black stained wooden shipping case which can also serve as a display case.