ID number: BIRUG: BU867 Institution: The Lapworth Museum of Geology Named collection: Holcroft Collection Definition: Acastocephala dudleyensis sp. nov. Object type: Trilobita Place collected: ENGLAND: West Midlands, Dudley Collector: Holcroft Chronostratigraphy: SILURIAN: Wenlock, Homerian Lithology: Much Wenlock Limestone Formation Type, figured or cited: Figured