Tucanoichthys tucano, specimen TCWC 20316.01, 14.4 mm SL, c&s. A. Supraneural elements associated with neural spines of vertebra 7–9, left side, lateral view. B. Vertebral centra 11–15, left side, lateral view. C. Vertebral centra 18–24, left side, lateral view. D. Vertebral centra 25–31(PU2), left side, lateral view. E. Caudal fin skeleton, left side, lateral view. Margin of uroneural and hypural 6 outlined with thin white line in E. Double white asterisk (**) indicates the position of caudal diastema. Abbreviations: CC, compound centrum; CRC, caudal radial cartilage; En, epineural; Ep, epipleural; Ep1–2, epural 1–2; H1–6, hypural 1–6; HS, hemal spine; KD, calcification of kidney; NS, neural spine; OC, opisthural cartilage; PH, parhypural; PS, pleurostyle; PU2, pleural centrum 2; R, rib; Sn, supraneural; SnC, supraneural cartilage; Ur, uroneural; V11–26, vertebral centrum 11–26.

  Part of: Mattox GMT, Conway KW (2021) Osteology of Tucanoichthys tucano Géry and Römer, an enigmatic miniature fish from the Amazon basin, Brazil (Teleostei: Characiformes: Characidae). Vertebrate Zoology 71: 645-667. https://doi.org/10.3897/vz.71.e71886