| Prosomapoda | |
|---|---|
 | |
| Cryptocellus goodnighti, aricinuleidarachnid | |
Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Arthropoda |
| Subphylum: | Chelicerata |
| Clade: | Euchelicerata |
| Clade: | Prosomapoda Lamsdell, 2013 |
| Groups | |
Prosomapoda is a clade ofeuchelicerates including the groupsXiphosura (horseshoe crabs) andPlanaterga (a group comprisingbunodids,pseudoniscids,chasmataspidids,eurypterids andarachnids), as well as several basalsynziphosurid 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 eucheliceratesOffacolus andDibasterium.[2][3]
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