Fig. 1.
Location map. A, map showing the location of the fossil site (black circle) in southern Minas Gerais State, southeastern Brazil; B, stratigraphic column and image of the Entre-Córregos Formation outcrop, type locality for †Bryconetes enigmaticus. Modified from Santos (1999) and Castro-Fernandes et al. (2013).
Fig. 2.
†Bryconetes enigmaticus n. gen. n. sp., holotype, UFRGS 19114. A, fossil specimen as preserved in lateral view; B, silicone peel from the counterpart; C,posterior part of the fish, with the caudal fin; D, enlargement of the caudal fin skeleton illustrating the modified neural arches and dorsal procurrent fin rays; E, detail of the anteriormost ventral procurrent rays showing the fused laminar rays (arrows). Scale bars = 5 mm.
Fig. 3.
Interpretative drawings for †Bryconetes enigmaticus n. gen. n. sp. based on the holotype (UFRGS 19114) and a silicone cast of the counterpart. A, anterior region of the fish; B,circumorbital bones, showing the striae and punctuation from the neuromasts in the inforaorbital 3. Scale bars = 2 mm. Abbreviations: aa, anguloarticular; c2-4, centra 2 to 4 (Weberian apparatus); cl, cleithrum; d, dentary; en, endopterygoid; ep, epiocipital; f, frontal; h, hyomandibular; io1-6, infraorbital 1 to 6; io.c, infraorbital sensory canal; ip, interopercle; le, lateral ethmoid; mx, maxilla; na.c4, neural arch of fourth vertebra; n.cx, neural complex; op, opercle; p, parietal; pa, parasphenoid; pm, premaxilla; po, preopercle; po.c, preopercular canal; pr, prootic; pt, pterotic; ptt, posttemporal; pts, pterosphenotic; q, quadrate; ra, retroarticular; scl, supracleithrum; soc, supraoccipital; sp, sphenotic; spo, supraorbital; v5, fifth vertebra.
Fig. 4.
†Bryconetes enigmaticus n. gen. n. sp., holotype, UFRGS 19114. A, a dentary tooth. B, first vertebra of Weberian apparatus. Arrow points to the facet for reception of scaphium. Scale bars = 200 µm.
Fig. 5.
†Bryconetes enigmaticus n. gen. n. sp., holotype, UFRGS 19114. A, dorsal fin. B, anal fin. Scale bars = 5 mm.
Fig. 6.
Diagramatic representation of the caudal-fin skeleton of † Bryconetes enigmaticus n. gen. n. sp. based on the holotype (UFRGS 19114). Abbreviations: a.vr, anterior ventral procurrent caudal-fin rays; cc, compound centrum; c.fr, principal caudal-fin rays; d.pr, dorsal procurrent caudal-fin rays; enp, especialized neural arch of compound centrum; ep, epurals; hp1-6, hypurals 1 to 6; hsp, haemal spine; mna, modified neural arch of preural centrum 2; php, parhypural; pr.c2-3, preural centra 2-3; ur, uroneural; v.pr, ventral procurrent caudal-fin rays.