SPECIES AcceptedHolaster simplex Shumard, 1853Source: The Paleobiology DatabaseReference taxon taxon.loadingAboutMetricsOccurence imagesSynonyms and combinationsCitationHolaster simplex Shumard, 1853 in GBIF Secretariat (2023). GBIF Backbone Taxonomy. Checklist dataset https://doi.org/10.15468/39omei accessed via GBIF.org on 2025-08-08.