Sutton, M. D.; Briggs, D. E. G.; Siveter, D. J.; Siveter, D. J.; Orr, P. J. (2002). The arthropod Offacolus kingi (Chelicerata) from the Silurian of Herefordshire, England: computer based morphological reconstructions and phylogenetic affinities. Proceedings of the Royal Society B: Biological Sciences. 269(1497): 1195-1203.
Sutton, M. D.; Briggs, D. E. G.; Siveter, D. J.; Siveter, D. J.; Orr, P. J.
2002
The arthropod Offacolus kingi (Chelicerata) from the Silurian of Herefordshire, England: computer based morphological reconstructions and phylogenetic affinities
Proceedings of the Royal Society B: Biological Sciences