Abstract
A slender extension of a rounded stump on the proximal portion of the left genal spine of Ceraurus plattinensis Foerste, 1920 from the Middle Ordovician of Ontario, Canada records the partial regeneration of a genal spine. The regenerated spine possesses almost normal prosopon of fine granules and resembles the distal portion of the normal right genal spine. It demonstrates the following aspects about this trilobite's physiology: partial regeneration of genal spines could take place even if severed proximally. partial regeneration of genal spines could take place even in late holaspid individuals and the pattern of regeneration took place in a distoproximal order.
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