Prosomapoda is a clade of euchelicerates including the groups Xiphosura (horseshoe crabs) and Planaterga (a group comprising bunodids, pseudoniscids, chasmataspidids, eurypterids and arachnids), as well as several basal synziphosurid genera.[1] The clade is defined by the lack of exopods (outer branches) of prosomal appendage II-V in the adult instar,[1] where in contrast the exopods of appendage II-V are well-developed in the non-prosomapod euchelicerates Offacolus and Dibasterium.[2][3]
| Prosomapoda
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|---|---|
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| Fossil of the basal prosomapod Weinbergina | |
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| Cryptocellus goodnighti, a ricinuleid arachnid | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Arthropoda |
| Subphylum: | Chelicerata |
| Clade: | Euchelicerata |
| Clade: | Prosomapoda Lamsdell, 2013 |
| Groups | |
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