Temporal range: Early Cambrian
(Lendzion, 1975) Lendzion, 1977
Cassubia is an anomalocaridid-like genus from the Early Cambrian of Kashubia - Poland, known from drillcore material, but generally accepted to represent the raptorial appendage of an anomalocaridid.
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, a name which soon proved to be preoccupied by a Middle Jurassic ammonoid. In his initial description, Lendzion interpreted the fossil as preserving 11 thoracic segments and a chelicera of a Leanchoilia-like arthropod. Subsequent study identified it as an anomalocaridid-like frontal appendage.
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. It bears particular similarity to Anomalocaris pennsylvanica and Tamisiocaris borealis.
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.
If the ventral spines possessed setae, Cassubia infercambriensis may have used its frontal appendages to filter through fine sediment.
- 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.
- 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.
- Lendzion, Kazimiera (1977). "Cassubia - a new generic name for Pomerania Lendzion, 1975". Geological Quarterly 21 (1).
- Lendzion, Kazimiera (1975). "Fauna of the Mobergella zone in the Polish Lower Cambrian" 19 (2). pp. 237–242.
- 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.