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Journal of Paleontology

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ORDOVICIAN AND SILURIAN HYOLITHS AND GASTROPODS REASSIGNED FROM THE HYOLITHA FROM THE GIRVAN DISTRICT, SCOTLAND

¹ University of Maryland, Unit 29216, APO AE 09102, <jmalinky{at}t-online.de>

Re-examination of type material of the hyolithids Hyolithes ardmillanensis Reed, 1909 from the lower Caradoc and H. candidus Reed, 1909 from the lower Ashgill suggests that these species are representatives of the genus Leolites Marek, 1967 to which they are referred with question. Hyolithes subcrispatus Reed, 1909 from the upper Ashgill, and H. sylvestris Reed, 1909 from the lower Llandovery are referred tentatively to Recilites Marek, 1967. These are the first occurrences of these genera outside of Bohemia, and the stratigraphic range of Recilites is extended considerably if H. sylvestris is in fact a representative of that genus. The orthothecid Hyolithes (Orthotheca) thraivensis Reed, 1909 from the upper Ashgill is now referred to the new genus Girvanolithes, to which the Caradocian H. (O.) subexcavatus Reed, 1909 is assigned with question. Girvanolithes thraivensis is exceptional because it is one of a small number of orthothecid species for which intestinal remains are known; equally remarkable is the fact that three such specimens were found, and these are the only hyolith intestines ever reported from Britain. The hyolithid species H. asteroideus Reed, 1909, H. columbanus Reed, 1909, H. girvanensis Reed, 1909, H. immemor Reed, 1909, H. multipunctatus Reed, 1909 and H. penkillensis Reed, 1909, and the orthothecid Hyolithes (Orthotheca) subornatus Reed, 1909 are here deemed unrecognizable owing to incomplete preservation. Ceratotheca? subuncata is reassigned to the gastropod genus Ecculiomphalus Portlock, 1843 with question.

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