Marcopoloichthys furreri sp. nov., illustrating the caudal fin and its endoskeleton. A. Photograph of holotype, PIMUZ A/I 2886; photograph was taken by T. Scheyer; B. Drawing of endoskeleton. Abbreviations: da, dorsal arcocentra; H1–5, hypurals 1–5; hsPU2–4, haemal spine of preural centra 2–4; int, interhaemal; PH, parhypural ot haemal spine of preural centrum 1; nsPU1–3, neural spine of preural centra 1–3; UN, uroneurals; va, ventral arcocentra. Small arrows point to a series of anterior processes. Scale bars: 1 mm.