Cybeloides and Lonchodomas Trilobites from Scotland

Description: I have recently been able to acquire a number of specimens coming from the famous Upper Ordovician Lady Burn Starfish Beds of the Girvan District of Scotland. While it is the most important starfish locality in the British Isles, it also contains a diverse representation of trilobite crinoids, carpoids and others. Specimens from the locality are not often made available, so this divers grouping is most uncommon. This part/counterpart example shows a Lonchodomas and the negative of a Cybeloides trilobite on one side and the positive of the Cybeloides on a second portion. Both trilobites are thought to have used their spines to keep them supported at the surface of a soft sea floor, showing two diverse evolutionary solutions to the same problem. The Cybeloides is additionally thought to have used its spines to help conceal its outline from predators. Both are rarely offered, particularly on the same matrix block, making this a highly desirable specimen.