Hypothesis of phylogenetic relationships of Marcopoloichthys furreri sp. nov. among crown neopterygians based on 132 characters and three outgroup taxa. Strict consensus tree of two most parsimonious trees: three length 374 steps, consistency index (CI) = 0.4599 and retention index (RI) = 0.7534. An asterisk identifies a uniquely derived character. Teleosteomorphs (Node C) are supported by the following synapomorphies: foramen for glossopharyngeal nerve placed in prootic or prootic-exoccipital suture (*); four pectoral proximal radials present (*); olfactory organ with accessory nasal sacs (*); craniotemporal muscle present (*); heart with two arterial valves (in the conus arteriosus) present (]*); muscles at the basal arteria (ventral aorta) absent (*); propterygium fused with first pectoral-fin ray; dorsal or epaxial leading margin of caudal fin with basal fulcra; and quadratojugal absent (Ch.127[1]). Node D is supported by two synapomorphies: supramaxilla or most posterior supramaxilla dorsal to maxilla and mid-caudal centra (adults) with diplospondylous centra. For other nodes see text and Arratia et al. (2021).