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A morphological and taxonomic appraisal of the oldest anomalocaridid from the Lower Cambrian of Poland

2015; Cambridge University Press; Volume: 152; Issue: 5 Linguagem: Inglês

10.1017/s0016756815000412

1469-5081

Allison C. Daley, David Legg,

Aquatic Invertebrate Ecology and Behavior

Abstract Material previously referred to as Cassubia infercambriensis was re-examined and found to represent a composite fossil of a Peytoia -like anomalocaridid frontal appendage and an arthropod of uncertain affinities comparable to some bivalved arthropod taxa. The frontal appendage is referred to the genus Peytoia based on the presence of elongated ventral spines bearing a single row of auxiliary spines. As well as representing the oldest example of an anomalocaridid in the fossil record (Series 2, Stage 3), Peytoia infercambriensis is also the only record of this group from the East European Craton, therefore extending both the temporal and geographic range of the anomalocaridid family Hurdiidae.