Planaterga

{{Short description|Clade of arthropods}}

{{Automatic taxobox

| taxon = Planaterga

| authority = Lamsdell, 2013

| fossil_range = {{Fossil range|earliest=505|Ordovician|Recent}}

| image = Limuloides limuloides specimen In 60018.jpg

| image_caption = Fossil of Limuloides limuloides, a bunodid

| image2 = Eatoniana namaquensis 46890827.jpg

| image2_caption = Eatoniana namaquensis, a mite arachnid

| subdivision_ranks = Groups

| subdivision = * †Bembicosoma

• †?Bunaia
• †Pasternakevia
• †Bunodidae
• †Pseudoniscidae
• Dekatriata

}}

Planaterga is a clade of prosomapod euchelicerates including several synziphosurid genera (mainly bunodids and pseudoniscids) and the group Dekatriata (which in turn includes arachnids, chasmataspidids and eurypterids).{{Cite journal|last=Lamsdell|first=James C.|date=2012-12-18|title=Revised systematics of Palaeozoic 'horseshoe crabs' and the myth of monophyletic Xiphosura|journal=Zoological Journal of the Linnean Society|language=en|volume=167|issue=1|pages=1–27|doi=10.1111/j.1096-3642.2012.00874.x|issn=0024-4082|doi-access=free}} Planaterga is defined by the opisthosoma with tergites broadest at third or fourth and lacking enlarged axial nodes, carapace (prosomal dorsal shield) with reduced genal spines, as well as somite VII (first opisthosomal segment) with reduced appendages and microtergite.