Maclurina manitobensis(Whiteaves) (Ordovician Gastropoda): the largest known Paleozoic gastropod

• Published in: Journal of Paleontology
• Main Authors: Rohr, David M., Blodgett, Robert B., Furnish, William M.
• Format: Article in Journal/Newspaper
• Language: English
• Published: Cambridge University Press (CUP) 1992
• Subjects: Arctic
• Online Access: http://dx.doi.org/10.1017/s0022336000021004; https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022336000021004

The concept of the Ordovician gastropod genus Maclurites Le Sueur, 1818, at present includes much variation. Maclurina Ulrich in Ulrich and Scofield, 1897, is removed as a subjective synonym of Maclurites and reestablished as a separate genus. Species of Maclurites with spiral grooves on the outer whorl surface and a relatively small umbilicus are transferred to Maclurina. Maclurina manitobensis (Whiteaves, 1890) forms a distinctive part of the Late Ordovician-age “Arctic Ordovician fauna.” An unusually large specimen (25 cm in diameter) from the Bighorn Dolomite (Upper Ordovician), Wyoming, is illustrated; this Wyoming specimen is the volumetrically largest Paleozoic gastropod ever reported.