Viscerocranium of Poeciliopsis jackschultzi (TCWC 20082.01, paratype, female, 23.0 mm SL) a hyopalatine arch right side in lateral view (image reversed) b ventral gill arches in dorsal view c dorsal gill arches (right side) in dorsal view d dorsal gill arches (right side) in ventral view (image reversed). Opercular bones outlined in black in a. Scale bar shared between c and d. Abbreviations: Aa, anguloarticular; Apa, autopalatine; Bb1C, basibranchial 1 cartilage; Bb2-3, basibranchials 2–3; Bh, basihyal; Cb1-5, ceratobranchials 1–5; De, dentary; Eb1-4, epibranchial 1–4; Ectp, ectopterygoid; Enpt, endopterygoid; Hb1-3, hypobranchials 1–3; Hy, hyomandibular; IC, interarcular cartilage; Iop, interopercle; GR, gill raker; Mx, maxilla; Op, opercle; Pb2-3, pharyngobranchial 2–3; Pbtp4, pharyngobranchial toothplate 4; Pmx, premaxilla; Pop, preopercle; Q, quadrate; Ra, retroarticular; Sop, subopercle; Sy, symplectic.