GEM Acernaspis Trilobite with Preserved Soft Tissue

Exibiting Segmentation of some limbs, claw feet, annulated antennae, and chromatophores

Acernaspis sp

Trilobites Order Phacopida, Family Phacopidae

Geologic Time: Early Silurian (~435 Million Years Ago)

Size (25.4 mm = 1 inch): Trilobites is 18 mm long (curve measure) by 8 mm wide on a 90 mm by 100 mm matrix

Fossil Site: Jupiter Formation, Eastern Quebec, Canada

Code: STF27

Price: Sold

Acernaspis Trilobite with Preserved Soft TissueDescription: The trilobite presented here is rarely offered since few have ever collected in this region, but what makes this one truly exceptional is the fact that it exhibits a type of soft tissue preservation I have only seen once Acernaspis Trilobite Screen Saverbefore. During the course of finish work along the edges of the thorax the preparator was astonished to see evidence of limbs and antennae preserved in a combination of iron (some flakes of pyrite) and calcite, an unprecedented occurrence. Segmentation of some limbs, claw feet, and annulated antennae are all evident. To the best of my knowledge no other example of this type of preservation has been reported in this taxon. And if that were not enough, there are several spots of preserved coloration in the form of chromatophores seen on the left pleural lobe. This extends preserved coloration in the phacopids back into the Silurian (see my other offerings for examples of Eldregeops) It is only through painstaking work with 50 nanometer powder that the features here were brought to light without complete destruction during the preparation process.

Reference: Palaeontographica Canadiana, Monograph 22, 2004.

Fossil Sales

click trilobite pictures to enlarge

Acernaspis Acernaspis Silurian Trilobite Acernaspis Phacopid Trilobite
Below: Melanophores (camouplage spots)
Below: Antennae with segmentation
Melanophores Trilobite Coloration Preserved
Trilobite Segmented annulated antennae
Below: Trilobite legs and claws
Below: Antenna with pyritic inclusions on the left pleural lobe
Below: Segmentation of some limbs, claw fee
Trilobite color chromatophores Trilobite Legs Trilobite segmented legs
Image J

Fossil Mall Navigation:
l Home l Fossils for Sale Map l Museum and Rare Fossils l How to Buy Fossils l

Navigate by Fossil Category:
l Trilobites
l Ammonites l Fish Fossils l Invertebrate Fossils l
l Crinoids and Echinoderms l Insect Fossils l Dinosaur and Reptile Fossils l
l Cambrian Explosion Fossils l Plant Fossils l Stromatolites l
l Vertebrate Fossils l Fossil Amber l Trace & Ichnofossils l

l Fossils and Paleotological Science Information l