Calymenidius

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{{Taxobox

| name = Calymenidius

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| regnum = Animalia

| phylum = Arthropoda

| classis = Trilobita

| ordo = Ptychopariida

| superfamilia = Ptychoparioidea

| familia = Lonchocephalidae

| genus = Calymenidius

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| subdivision_ranks = Species

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}}

Calymenidius is an extinct genus of trilobites.