Martillichthys is an extinct genus of pachycormiform fish, known from the late Middle Jurassic (Callovian) Oxford Clay, England. It is a member of the suspension feeding clade within the Pachycormiformes, most closely related to Asthenocormus.LISTON, J. J. 2008. A review of the characters of the edentulous pachycormiforms Leedsichthys, Asthenocormus and Martillichthys nov. gen. 181–198. In ARRATIA, G., SCHULTZE, H. P. and WILSON, M. V. H. (eds). Mesozoic Fishes 4 – Homology and phylogeny. Verlag Dr Friedrich Pfeil, Munich, 502 pp
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