 However, in 1986, David Martill compared the bones of "Leedsichthys" to a pachycormid that he had recently discovered, "Asthenocormus".The unusual proportions of that specimen gave a wide range of possible sizes.Some were as low as 13.5 metres (44.3 feet), but extrapolating from the gill basket resulted in an estimated length of 27.6 metres (90.6 feet) for "Leedsichthys" specimen NHM P.10156 (the earlier BMNH P.10156).