Contributed by Louis Zachos, March 2010
|Distribution||Lower Carboniferous (Mississippian - Tournaisian) of northern Utah, western Wyoming. Upper part of Lodgepole Formation, Strawberry Creek, Lincoln Co., Wyoming; Brush Creek Member, Henderson Canyon Formation, Beirdneau Hollow, Logan Canyon, Cache Co., Utah.|
|Type||Aarchaeocidaris strawberryensis Webster, 1937, p. 37, by original designation. Holotype USNM 487247, paratypes USNM 487248, 487249|
|Species Included||Only the type species.|
|Classification and/or Status||Junior synonym of Palaechinus|
|Remarks||Additional diagnostic characters of the types are relatively thick, non-imbricate interambulacral plates with fine tuberculation; ambulacral plates all equal in size, slightly imbricate over interambulacral plates along adradial suture; pores biserial, located along adradial edge of plates; apical system small, monocyclic, 2-3 gonopores per gential plate. These characters are diagnostic for Palaechinidae, and suggest a closer affinity with Palaechinus than Maccoya.
Webster, Gary D. 1997. Lower Carboniferous Echinoderms from Northern Utah and Western Wyoming. Bulletin of the Utah Geological Survey 128, 1-65.