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- Chasmataspidida ist eine ausgestorbene Ordnung innerhalb der Kieferklauenträger (Chelicerata). (de)
- Chasmataspidids, sometime referred to as chasmataspids, are a group of extinct chelicerate arthropods that form the order Chasmataspidida. Chasmataspidids are probably related to horseshoe crabs (Xiphosura) and/or sea scorpions (Eurypterida), with more recent studies suggest that they form a clade (Dekatriata) with Eurypterida and Arachnida. Chasmataspidids are known sporadically in the fossil record through to the mid-Devonian, with possible evidence suggesting that they were also present during the late Cambrian. Chasmataspidids are most easily recognised by having an opisthosoma divided into a wide forepart (preabdomen) and a narrow hindpart (postabdomen) each comprising 4 and 9 segments respectively. There is some debate about whether they form a natural (i.e. monophyletic) group. (en)
- カスマタスピス類（Chasmataspidid, Chasmataspid, 学名：Chasmataspidida）は、鋏角類に属する化石節足動物の分類群（目）の1つ。カブトガニやウミサソリに似た姿で、4節の幅広い前腹部と9節の細い後腹部をもつ。代表的なだけでなく、など十数種も含まれる。 少なくとも古生代のオルドビス紀からデボン紀にかけて生息し、さらに早期のカンブリア紀から本群由来の可能性がある生痕化石も発見される。希少で未だに不明点が多く、ウミサソリなどとの類縁関係が議論の的となっている。 (ja)
- I casmataspididi (Chasmataspidida), a volte indicati come casmataspidi (Chasmataspida), sono un gruppo di artropodi chelicerati estinti, forse imparentati con gli xifosuri, gli euripteridi o gli aracnidi. Vissero tra l'Ordoviciano medio e il Devoniano medio (circa 470 - 390 milioni di anni fa) e i loro resti fossili sono stati ritrovati in Europa, Nordamerica e Asia. (it)
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- 31065 (xsd:nonNegativeInteger)
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- Caster & Brooks, 1956 (en)
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- Summarized phylogenetic position of Chasmataspidida as of 2010s. (en)
- Internal phylogeny of Chasmataspidida based on Selden, Lamsdell & Liu , with addition of Diploaspis praecursor based on Lamsdell & Briggs . (en)
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- (Possible Cambrian record) (en)
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- Reconstruction of Dvulikiaspis menneri , Octoberaspis ushakovi , Hoplitaspis hiawathai , Chasmataspis laurencii and Diploaspis casteri . (en)
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- Fossils of Hoplitaspis hiawathai. (en)
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- *†Chasmataspididae (Caster & Brooks, 1956)
*†Diploaspididae (Størmer, 1972)
*†Kiaeria (Størmer, 1934) (en)
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- *Diploaspidida (Simonetta & Delle Cave, 1978) (en)
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- Chasmataspidida ist eine ausgestorbene Ordnung innerhalb der Kieferklauenträger (Chelicerata). (de)
- Chasmataspidids, sometime referred to as chasmataspids, are a group of extinct chelicerate arthropods that form the order Chasmataspidida. Chasmataspidids are probably related to horseshoe crabs (Xiphosura) and/or sea scorpions (Eurypterida), with more recent studies suggest that they form a clade (Dekatriata) with Eurypterida and Arachnida. Chasmataspidids are known sporadically in the fossil record through to the mid-Devonian, with possible evidence suggesting that they were also present during the late Cambrian. Chasmataspidids are most easily recognised by having an opisthosoma divided into a wide forepart (preabdomen) and a narrow hindpart (postabdomen) each comprising 4 and 9 segments respectively. There is some debate about whether they form a natural (i.e. monophyletic) group. (en)
- カスマタスピス類（Chasmataspidid, Chasmataspid, 学名：Chasmataspidida）は、鋏角類に属する化石節足動物の分類群（目）の1つ。カブトガニやウミサソリに似た姿で、4節の幅広い前腹部と9節の細い後腹部をもつ。代表的なだけでなく、など十数種も含まれる。 少なくとも古生代のオルドビス紀からデボン紀にかけて生息し、さらに早期のカンブリア紀から本群由来の可能性がある生痕化石も発見される。希少で未だに不明点が多く、ウミサソリなどとの類縁関係が議論の的となっている。 (ja)
- I casmataspididi (Chasmataspidida), a volte indicati come casmataspidi (Chasmataspida), sono un gruppo di artropodi chelicerati estinti, forse imparentati con gli xifosuri, gli euripteridi o gli aracnidi. Vissero tra l'Ordoviciano medio e il Devoniano medio (circa 470 - 390 milioni di anni fa) e i loro resti fossili sono stati ritrovati in Europa, Nordamerica e Asia. (it)
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- Chasmataspidida (en)
- Chasmataspidida (de)
- Chasmataspidida (it)
- Chasmataspidida (ja)
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