疊盤角石 Treatise on Invertebrate Paleontology (英语:Treatise on Invertebrate Paleontology ) in the section on the Trocholitidae, pp K359-K362, in the Chapter on the
優原穴鱟成,體節邊緣有棘刺。最後一個體節則為很長的尾刺。 古無脊椎動物論文(英语:Treatise on Invertebrate Paleontology )(Treatise on Invertebrate Paleontology )描述優原穴鱟有「小型楔形心臟裂片,藉由不同的軸相接,環紋腹盾與突起的尾端。」
原正形贝目 编. Part H, Brachiopoda (Revised). Treatise on Invertebrate Paleontology (英语:Treatise on Invertebrate Paleontology ). Boulder, Colorado; Lawrence, Kansas:
小嘴貝綱support,而其他目的腕足成圈。 Treatise on Invertebrate Paleontology , Part H, Brachiopoda Revised. [2013-03-06]. (原始内容存档于2020-02-16). Treatise on Invertebrate Paleontology , Part
海神石by Chris Pellant and Roger Phillips Treatise on Invertebrate Paleontology (英语:Treatise on Invertebrate Paleontology ), Part L Ammonoidea; Geological Society