| Praecambridium Temporal range: Late Ediacaran, around
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|---|---|
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| Artist's restoration of P. sigillum | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | †Proarticulata |
| Class: | †Cephalozoa |
| Family: | †Yorgiidae (?) |
| Genus: | †Praecambridium Glaessner & Wade, 1966 |
| Species: | †P. sigillum
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| Binomial name | |
| †Praecambridium sigillum Glaessner and Wade, 1966
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Praecambridium sigillum is an extinct organism that superficially resembles a segmented trilobite-like arthropod.[1] It was originally described as being a trilobite-like arthropod, though the majority of experts now place it within the Proarticulata as a close relative of the much larger Yorgia.[2][3] It is from the Late Ediacaran deposit of Ediacara Hills, Australia, about 555 million years ago. On average, P. sigillum had at least 5 pairs of segments, with each unit becoming progressively larger as they approach the cephalon-like head.
- ^ Glaessner, M.F.; Wade, M. (1971). "Praecambridium – a primitive arthropoda". Lethaia. 4 (1): 71–77. Bibcode:1971Letha...4...71G. doi:10.1111/j.1502-3931.1971.tb01280.x.
- ^ Ivantsov, Andrey Yu. (2007). "Small Vendian transversely Articulated fossils". Paleontological Journal. 41 (2): 113–122. Bibcode:2007PalJ...41..113I. doi:10.1134/S0031030107020013. S2CID 86636748.
- ^ Ivantsov, A.Y. (2001). "Vendia and Other Precambrian "Arthropods"". Paleontological Journal. 35 (4): 335–343.