Cephalaspis lyelli Agassiz
One of the most important Lyell’s specimens is the lectotype of Cephalaspis lyelli Agassiz, 1835 (NHMUK PV OR 20087) from the Lower Old Red Sandstone of Glammis, Forfar (Scotland) that was donated by to the NHM by Lyell in 1846. This one was described and figured by his friend Jean Louis Rodolphe Agassiz (1807-1873) in his book Recherches sur les poisons fossils in 1835 (p. 135) and the figures in 1837 (pl. la, Fig. 2). It was on display for the Geological Society and currently is part of the fossil fish collections at the NHM. This almost complete animal in part (the counterpart, also at the NHM, with the registration number NHMUK PV P 3233, belonged to the collection of William Cole, 3rd Earl of Enniskillen [1807-1886]) was described by Agassiz (1835) with four other more specimens from various localities of Scotland and England. Later Edwin Ray Lankester (1847-1929) in 1870 erected two new species for three of those four specimens: Cephalaspis powriei Lankester, 1870 (now Janaspis powrieri [Lankester, 1870]) and Cephalaspis agassizi Lankester, 1870; and chose the most complete specimen of Cephalaspis lyelli Agassiz, 1835 as lectotype (NHMUK PV OR 20087). Currently this species that lived from Silurian to Devonian times (443-358 Ma) is the only one species referred to the genus Cephalaspis Agassiz, 1835.
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