Rananasus

{{italic title}}

{{Taxobox

|name = Rananasus

|status = fossil

|fossil_range = Early Arenig{{cite journal

| last = Sepkoski| first = Jack| title = A compendium of fossil marine animal genera (Trilobita entry)| journal = Bulletins of American Paleontology| volume = 364|page=560| year = 2002| url = http://strata.ummp.lsa.umich.edu/jack/showgenera.php?taxon=307&rank=class| access-date = 2008-01-12 }}

|regnum = Animalia

|phylum = Arthropoda

|classis = Trilobita

|ordo = Proetida

|superfamilia =

|genus = Rananasus

}}

Rananasus is an extinct genus from a well-known class of fossil marine arthropods, the trilobites. It lived during the early part of the Arenig stage of the Ordovician Period, a faunal stage which lasted from approximately 478 to 471 million years ago.