Redescription of Drepanopterus pentlandicus Laurie, 1892, the earliest known mycteropoid (Chelicerata: Eurypterida) from the early Silurian (Llandovery) of the Pentland Hills, Scotland. Earth and Environmental Science Transactions of the Royal Society of Edinburgh, 103(1) 2012: 77-103. 80 [Zoological Record Volume 150]