Cleistosphaeridium

{{short description|Genus of protists (fossil)}}

{{Taxobox

| image =

| image_caption =

| image_alt =

| domain = Eukaryota

| unranked_regnum = SAR

| unranked_superphylum = Alveolata

| phylum = Dinoflagellata

| classis = Dinophyceae

| ordo = Gonyaulacales

| familia = incertae sedis

| genus = Cleistosphaeridium

| genus_authority = Davey et al., 1966Davey et al., 1966, p. 166

| subdivision_ranks = Species

| subdivision =

}}

Cleistosphaeridium is a genus of dinoflagellates in the order Gonyaulacales.