Temporal range: Cambrian Stage 3
|Reconstruction of Kerygmachela kierkegaardi based on later observation of 2018.|
|Former reconstruction of Kerygmachela kierkegaardi, showing a pair of cerci.|
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Kerygmachela kierkegaardi was a gilled lobopodian from the Buen Formation (Cambrian Stage 3) of the Sirius Passet Lagerstätte, in northern Greenland. Its anatomy strongly suggests that it, along with its relative Pambdelurion whittingtoni, was a close relative of anomalocaridid (radiodont) and euarthropod. The specific name, "kierkegaardi" honors Danish philosopher Søren Kierkegaard.
It had a pair of well-developed frontal appendages that had long spines. These limbs correspond to the frontal appendages of anomalocaridids. A pair of sessile eyes located near the base of these appendages. A small anterior-facing mouth located below its head and bearing a pair of stylet-like structures. The body had 11 segments indicated by 4 turberculates on each of them, associated with 11 pairs of lateral swimming lobes with gill-like structure, along with 11 pairs of small legs (lobopods) at the lobes' bases. The body ends with a single tail spine which formerly thought to be a pair of cerci. It also had well-developed pharynx and arthropod-like gut glands.
The spiny frontal appendages suggest that it may have been a predator; however, fossils indicate total size of approximately 175 mm and, with a relatively small mouth, indicating that it would have been restricted to very small prey.
Further reading [ edit ]
- Budd, G. E. (1999), "The morphology and phylogenetic significance of Kerygmachela kierkegaardi Budd (Buen Formation, Lower Cambrian, N Greenland)", Transactions of the Royal Society of Edinburgh, 89 (4): 249–290, doi:10.1017/S0263593300002418
References [ edit ]
- Park, Tae-Yoon S.; Kihm, Ji-Hoon; Woo, Jusun; Park, Changkun; Lee, Won Young; Smith, M. Paul; Harper, David A. T.; Young, Fletcher; Nielsen, Arne T.; Vinther, Jakob (2018-03-09). "Brain and eyes of Kerygmachela reveal protocerebral ancestry of the panarthropod head". Nature Communications. 9 (1): 1019. doi:10.1038/s41467-018-03464-w. ISSN 2041-1723. PMC 5844904. PMID 29523785.
- Budd, Graham E. (1993), "A Cambrian gilled lobopod from Greenland", Nature, 364 (6439): 709–711, doi:10.1038/364709a0
- Park, Tae-Yoon S.; Kihm, Ji-Hoon; Woo, Jusun; Park, Changkun; Lee, Won Young; Smith, M. Paul; Harper, David A. T.; Young, Fletcher; Nielsen, Arne T. (2018-03-09). "Brain and eyes of Kerygmachela reveal protocerebral ancestry of the panarthropod head". Nature Communications. 9 (1): 1019. doi:10.1038/s41467-018-03464-w. ISSN 2041-1723. PMC 5844904. PMID 29523785.
- Leanchoilia guts and the interpretation of three-dimensional structures in Burgess Shale-type fossils, Paleobiology
- Vannier, Jean; Liu, Jianni; Lerosey-Aubril, Rudy; Vinther, Jakob; Daley, Allison C. (2014-05-02). "Sophisticated digestive systems in early arthropods". Nature Communications. 5 (1): 1–9. doi:10.1038/ncomms4641. ISSN 2041-1723. PMID 24785191.
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