Walcottophycus

{{Short description|Extinct genus of alga}}

{{Speciesbox

| fossil_range = {{Fossil range|Burgess Shale}}

| genus = Walcottophycus

| species = gyges

| image_caption = W. gyges

| image = Walcottophycus_gyges_as_Bosworthia_gyges_Walcott_1919.jpg

| authority = Wu et al 2016 (Walcott 1919){{cite journal|last1=Wu|first1=Mengyin|last2=LoDuca|first2=Steven T.|last3=Zhao|first3=Yuanlong|last4=Xiao|first4=Shuhai|title=The macroalga Bosworthia from the Cambrian Burgess Shale and Kaili biotas of North America and China|journal=Review of Palaeobotany and Palynology|volume=230|year=2016|pages=47–55|issn=0034-6667|doi=10.1016/j.revpalbo.2016.04.001|doi-access=free}}

}}

Walcottophycus is a probable green algae with a wefty construction, known from the mid-Cambrian Burgess Shale and Kaili Formations. Its single species, W. gyges, was originally assigned to the similar algal genus Bosworthia.