Echinocystitid with heavily imbricate, scale-like interambulacral plates, and uniserial half-ambulacra. Ambulacral ... [details]
Named for Anticosti Island where the type species was located. [details]
The species name recognizes Allen Petryk, who collected the specimen. [details]
Silurian (Llandovery, late Aeronian to early Telychian) [details]
Silurian (Llandovery); late Aeronian to early Telychian, though the precise horizon is unknown. [details]
latest Llandovery, Silurian, crenulata-zone; Thompson et al. 2022: "Llandovery, Telychian" [details]
Ludfordian (Ludlow) [details]
C. murchisoni Zone; Wenlock, Homerian [details]
Sheinwoodian or Homerian, Wenlockian, Middle Silurian [details]
Homerian, Wenlock, Silurian [details]
Llandovery,Telychian [details]
Lower Ludlow [details]
Gorstian, Early Ludlow, Late Silurian [details]
The associated fauna indicates that this new echinoid was most probably from a horizon from the Goéland Member of ... [details]
Lower Lentwardine Formation [details]
Klinteberg Formation [details]
Rochester Formation [details]
Sheinwoodian, Wenlock [details]
“About the age of the Slite Group” (Calner and Jeppsson 2003; Jeppsson et al. 2006) [details]
Wenlock Limestone [details]
Miss Phillips’ Conglomerate (Wych Formation) [details]
Hemse Marl [details]
Apparently attributed to Maccoya tentatively in Thompson et al. 2022 (Maccoya is placed under quotation marks in ... [details]
Anticosti Island, Quebec [details]
Lentwardine, Herefordshire, England, UK [details]
Klinteberget, Gotland, Sweden [details]
Rochester, New York, USA [details]
Lansa, Farön, Sweden [details]
Dudley, Worcestershire, England, UK [details]
Under Worcester Beacon, Malvern Hills, Worcestershire, England, UK [details]
Mannegarde, Lye and Linde klint, Gotland, Sweden [details]
Holotype: MPEP488.1 (a single specimen that has been broken into four primary pieces). MPEP = Musée de ... [details]