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Chasmastaspidida

Classe de artrópodos quelicerados fósseis e aquáticos com registro no Ordoviciano dos EUA(uma espécie), Devoniano da Alemanha, Rússia e Escócia(quatro espécies) e Siluriano da Escócia(uma espécie). Há indícios de ocorrência desde o Cambriano. Eram anteriormente tidos como pertencentes aos Xiphosura, mas hoje são alocados em um táxon à parte. Relacionados aos Xiphosura e Eurypterida. É considerado um grupo monofilético. Apresentam quatro segmentos no mesossoma e nove no metassoma, o que difere dos Xiphosura e Eurypterida. Provavelmente foram predadores.

Referências

Jason A. Dunlop, Lyall I. Anderson & Simon J. Braddy (2004). "A redescription of Chasmataspis laurencii Caster & Brooks (Chelicerata: Chasmataspidida) from the Middle Ordovician of Tennessee, USA, with remarks on chasmataspid phylogeny" (PDF). Transactions of the Royal Society of Edinburgh: Earth Sciences 94 (4): 207–205.

Markus Poschmann, Lyall I. Anderson & Jason A. Dunlop (2005). "Chelicerate arthropods, including the oldest phalangiotarbid arachnid, from the Early Devonian (Siegenian) of the Rhenish Massif, Germany" (PDF). Journal of Paleontology 79 (1): 110–124.

Jason A. Dunlop, L. I. Anderson & S. J. Braddy (1999). "A new chasmataspid (Chelicerata: Chasmataspida) from the Lower Devonian of the Midland Valley of Scotland". Transactions of the Royal Society of Edinburgh: Earth Sciences 89: 161–165.

Lyall I. Anderson, Jason A. Dunlop & Nigel H. Trewin (2000). "A Middle Devonian chasmataspid arthropod from Achanarras Quarry, Caithness, Scotland". Scottish Journal of Geology 36: 151–158.

Jason A. Dunlop (2002). "Arthropods from the Lower Devonian Severnaya Zemlya Formation of October Revolution Island, Russia". Geodiversitas 24 (2): 349–379.

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