Peytoia infercambriensis
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Scientific classification 
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Cassubia is an anomalocaridid-like genus from the Early Cambrian of Kashubia - Poland,[1] known from drillcore material, but generally accepted to represent the raptorial appendage of an anomalocaridid.[2]
Etymology
Cassubia is derived from the Latinization of Kaszuby, the region in Poland where the holotype specimen was discovered.[3] The species name refers to its being discovered in Lower Cambrian rocks.[4]
History
The holotype--and only--specimen was recovered from the Kościerzyna borehole, in Lower Cambrian rocks. It was described by Kazimiera Lendzion in 1975 and given the name Pomerania infercambriensis,[4] a name which soon proved to be preoccupied by a Middle Jurassic ammonoid.[3] In his initial description, Lendzion interpreted the fossil as preserving 11 thoracic segments and a chelicera of a Leanchoilia-like arthropod.[4] Subsequent study identified it as an anomalocaridid-like frontal appendage.[5]
Classification
Cassubia infercambriensis may represent a transitional form between taxa with two rows of similar ventral spines such as Anomalocaris pennsylvanica and taxa with highly differentiated ventral spines such as Peytoia nathorsti.[5] It bears particular similarity to Anomalocaris pennsylvanica and Tamisiocaris borealis.[5][2]
Description
The frontal appendage was made up of at least 18 segments and had long, straight ventral spines. It is not known whether the ventral spines were paired like in most related taxa. On the anterior edge of the spines were minute serrations which may form the bases of setae.[5]
Paleobiology
If the ventral spines possessed setae, Cassubia infercambriensis may have used its frontal appendages to filter through fine sediment.[5]
References
- ^ Budd, G. E.; Jensen, S. (2000). "A critical reappraisal of the fossil record of the bilaterian phyla". Biological Reviews of the Cambridge Philosophical Society. 75 (2): 253–95. doi:10.1111/j.1469-185X.1999.tb00046.x. PMID 10881389.
- ^ a b Daley, Allison C.; Peel, John S. (2010). "A possible anomalocaridid from the Cambrian Sirius Passet Lagerstätte, North Greenland". Journal of Paleontology. 84 (2): 352–355. doi:10.1666/09-136R1.1.
- ^ a b Lendzion, Kazimiera (1977). "Cassubia - a new generic name for Pomerania Lendzion, 1975". Geological Quarterly. 21 (1).
- ^ a b c Lendzion, Kazimiera (1975). "Fauna of the Mobergella zone in the Polish Lower Cambrian". 19 (2): 237–242.
{{cite journal}}: Cite journal requires|journal=(help) - ^ a b c d e Dzik, Jerzy; Lendzion, Kazimiera (1988). "The oldest arthropods of the East European Platform". Lethaia. 21: 29–38. doi:10.1111/j.1502-3931.1988.tb01749.x.