Marcopoloichthys furreri sp. nov., illustrating the caudal fin and its endoskeleton. A. paratype PIMUZ A/I 2841; area with oblique lines represent a damaged region; B. paratype PIMUZ A/I 1958. Abbreviations: a.f, accessory fulcra; d.sc, dorsal caudal scute; e.bfu, epaxial basal fulcra; h.bfu, hypaxial basal fulcra; h.ff, hypaxial fringing fulcra; hsPU4, haemal spine of preural vertebra 4; H1–3, hypurals 1–3; nsPU1, 4, neural spine of preural vertebrae 1, 4; PH, parhypural; pr.r1–2, procurrents rays 1–2; UN, uroneurals; v.sc, ventral caudal scute; 1stPR, first principal caudal ray; 20thPR, principal caudal ray numbered 20; 21stPR, principal caudal ray numbered 21; ?, broken bases of hypurals 4 and 5? Scale bars: 1 mm.