Bicknell, R.D. and Pates, S., 2019. Xiphosurid from the
Tournaisian (Carboniferous) of Scotland confirms deep
origin of Limuloidea. Scientific reports, 9(1), pp.1-13.
open access
A related paper is:
Bicknell, R.D., Pates, S. and Botton, M.L., 2019. Euproops
danae (Belinuridae) cluster confirms deep origin of
gregarious behaviour in xiphosurids. Arthropoda Selecta.
Русский артроподологический журнал, 28(4), pp.549-555.
open access
Alternative file of above paper
Yours,
Paul H.