Pseudoniscidae

Pseudoniscidae is an extinct family of synziphosurine chelicerates that lived in the Silurian. Pseudoniscidae is classified inside the clade Planaterga, alongside Bunodidae and Dekatriata (chasmataspidids, eurypterids and arachnids).[1] Pseudoniscidae is composed by two genera, Cyamocephalus and Pseudoniscus (the type genus).[2][1][3]

Pseudoniscidae Temporal range: Silurian PreꞒ Ꞓ O S D C P T J K Pg N
Restoration of Pseudoniscus roosevelti and Cyamocephalus loganensis
Scientific classification
Kingdom:	Animalia
Phylum:	Arthropoda
Subphylum:	Chelicerata
Clade:	Prosomapoda
Clade:	Planaterga
Family:	†Pseudoniscidae Packard, 1886
Type species
†Pseudoniscus aculeatus Nieszkowski, 1859
Genera
†Cyamocephalus †Pseudoniscus

References

1. 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. doi:10.1111/j.1096-3642.2012.00874.x. ISSN 0024-4082.
2. Anderson, Lyall I. (1999-01-01). "A new specimen of the Silurian synziphosurine arthropod Cyamocephalus". Proceedings of the Geologists' Association. 110 (3): 211–216. doi:10.1016/S0016-7878(99)80071-6. ISSN 0016-7878.
3. Dunlop, J. A.; Penney, D.; Jekel, D. (2020). "A summary list of fossil spiders and their relatives" (PDF). World Spider Catalog. Natural History Museum Bern. pp. 1–296.