Both Anisacanthus and Holodiscus are what level of classification?
Holodiscus Holodiscus (syn. "Sericotheca") is a genus of flowering plants in the family Rosaceae, native to the Americas, from southwestern British Columbia, Canada and the western United States south to Bolivia.
Stigmadiscus Stigmadiscus is an extinct genus of eodiscinid agnostid trilobites. It lived during the Botomian stage, which lasted from approximately 524 to 518.5 million years ago, during the Cambrian Period.