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*Lasanius problematicus* Traquair; 'ribs'/'fin rays'

Seggholm, [nr.] Muirkirk [Lesmahagow], (Ayrshire) [(Lanarkshire)], [Scotland] Downtonian, [Pridoli], [Silurian (Upper)] On loan 2682 to Mark Purnell of Leicester University.

Little skeletal ossification occurs in this member of the Anaspida (Lasaniidae), but unusually the fin rays/ribs appear to solid rather than void fossils.