Cyamocephalus Explained

Cyamocephalus is a genus of synziphosurine,^[1] a paraphyletic group of fossil chelicerate arthropods.^[2] Cyamocephalus was regarded as part of the clade Planaterga.^{[3] [4] [5]} Fossils of the single and type species, C. loganensis, have been discovered in deposits of the Silurian-aged Patrick Burn Formation in Lesmahagow, Scotland (in the United Kingdom). Cyamocephalus is one of the two members of the family Pseudoniscidae, the other being Pseudoniscus.^{[6] [7]} Cyamocephalus differ from Pseudoniscus by the fused tergites of 6th and 7th opisthosomal segments.

Notes and References

1. Anderson. Lyall I.. 1999-01-01. A new specimen of the Silurian synziphosurine arthropod Cyamocephalus. Proceedings of the Geologists' Association. en. 110. 3. 211–216. 10.1016/S0016-7878(99)80071-6. 1999PrGA..110..211A. 0016-7878.
2. Bicknell. Russell D. C.. Pates. Stephen. 2020. Pictorial Atlas of Fossil and Extant Horseshoe Crabs, With Focus on Xiphosurida. Frontiers in Earth Science. en. 8. 98. 10.3389/feart.2020.00098. 2020FrEaS...8...98B. 2296-6463. free.
3. Selden. Paul A.. Lamsdell. James C.. Qi. Liu. An unusual euchelicerate linking horseshoe crabs and eurypterids, from the Lower Devonian (Lochkovian) of Yunnan, China. Zoologica Scripta. 2015. 44. 6. 645–652. 10.1111/zsc.12124. 55264483. 0300-3256. free.
4. Lamsdell. James C.. Briggs. Derek E. G.. Liu. Huaibao P.. Witzke. Brian J.. McKay. Robert M.. 2015. A new Ordovician arthropod from the Winneshiek Lagerstätte of Iowa (USA) reveals the ground plan of eurypterids and chasmataspidids. The Science of Nature. en. 102. 9–10. 63. 10.1007/s00114-015-1312-5. 26391849. 2015SciNa.102...63L. 8153035. 0028-1042.
5. Bicknell. Russell D. C.. Lustri. Lorenzo. Brougham. Tom. 2019-12-01. Revision of "Bellinurus" carteri (Chelicerata: Xiphosura) from the Late Devonian of Pennsylvania, USA. Comptes Rendus Palevol. en. 18. 8. 967–976. 10.1016/j.crpv.2019.08.002. 2019CRPal..18..967B. 1631-0683.
6. Book: http://www.wsc.nmbe.ch/resources/fossils/Fossils19.0.pdf. World Spider Catalog. Dunlop. J. A.. Penney. D.. Jekel. D.. Natural History Museum Bern. 2018. A summary list of fossil spiders and their relatives. 1–296.
7. Lamsdell. James C.. 2013. Revised systematics of Palaeozoic 'horseshoe crabs' and the myth of monophyletic Xiphosura. Zoological Journal of the Linnean Society. 167. 1. 1–27. 10.1111/j.1096-3642.2012.00874.x. 0024-4082. free.