Holophragma

{{Short description|Extinct genus of corals}}

Holophragma is an extinct genus of rugose coral known from Ordovician and Silurian rocks in Scandinavia, Russia, Australia and the United States.{{cite web|url=https://paleobiodb.org/classic/checkTaxonInfo?taxon_no=5510 |title=Holophragma |publisher=Fossilworks |date= |access-date=17 December 2021}} Two of its species can be found on the northwestern coast of Gotland, where it is one of the most common fossil genera.Sunstones and catskulls. Guide to the Fossils and geology of Gotland. Sara Elison. s.64. 2000 It was described by Gustaf Lindström in the year 1896.{{cite web|url=https://fossiilid.info/7912?mode=in_baltoscandia&lang=en |title=Holophragma |publisher=Fossiilid.info |date= |accessdate=2019-06-06}} The genus contains two species.

{{Taxobox

| name = Holophragma

|fossil_range = {{fossil range|Late Ordovician|Late silurian|Ordovician–Silurian}}

| image = File:Holophragma calceoloides.jpg

| image_alt = A illustration depicting H.calceoloides

| image_caption = The species Holophragma calceoloides.

| regnum = Animalia

| phylum = Cnidaria

| classis = Anthozoa

| ordo = †Rugosa

| familia = †Lykophyllidae

| genus = †Holophragma

| genus_authority = Lindström, 1896

| subdivision_ranks = Species

| subdivision = See list of Holophragma species

}}

== Description ==

Members of the genus Holophraga are small shoe- or horn-shaped corals. They usually lived on their side, with their calyx pointing upwards. H. calceoloides has a distinct cardinal septa, while H. mitrata does not.