Abstract

Re-examination of type material of the hyolithids Hyolithes ardmillanensisReed, 1909 from the lower Caradoc and H. candidusReed, 1909 from the lower Ashgill suggests that these species are representatives of the genus LeolitesMarek, 1967 to which they are referred with question. Hyolithes subcrispatusReed, 1909 from the upper Ashgill, and H. sylvestrisReed, 1909 from the lower Llandovery are referred tentatively to RecilitesMarek, 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) thraivensisReed, 1909 from the upper Ashgill is now referred to the new genus Girvanolithes, to which the Caradocian H. (O.) subexcavatusReed, 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. asteroideusReed, 1909, H. columbanusReed, 1909, H. girvanensisReed, 1909, H. immemorReed, 1909, H. multipunctatusReed, 1909 and H. penkillensisReed, 1909, and the orthothecid Hyolithes (Orthotheca) subornatusReed, 1909 are here deemed unrecognizable owing to incomplete preservation. Ceratotheca? subuncata is reassigned to the gastropod genus EcculiomphalusPortlock, 1843 with question.

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