Marcopoloichthys furreri sp. nov., illustrating a lateral view of the abdominal or precaudal region of the vertebral column and associated elements and the dorsal fin and endoskeletal support (paratype PIMUZ A/I 1958). Small arrows point to the epineural processes. Abbreviations: aptg, 1st anal pterygiophore or proximal radial; dptg, dorsal pterygiophores or proximal radials; int.d, interdorsal arcocentrum; int.v, interventral arcocentrum; l.dptg, last dorsal pterygiophore; pap, parapophyses; sc?: scale or scute?; sncar, supraneural carrier; sn1–8, supraneurals 1–8; 1st cv?, first caudal vertebra?; 1stdptg, first dorsal pterygiophore or fused proximal radials. Scale bar: 1 mm.