A new generic name for the “Lepadichthys” lineatus complex with a rediagnosis of Discotrema, a senior synonym of Unguitrema, and comments on their phylogenetic relationships (Gobiesocidae: Diademichthyinae)

Viscerocranium of Rhinolepadichthys polyastrous (SAIAB 9319, 25.0 mm SL [except scanning electron micrograph]). A Hyopalatine arch and opercular series (right side) in lateral view (image reversed), outline of preopercle, opercle, and subopercle highlighted by thin black line, thin dashed line indicates damage to margin of preopercle; B lower jaw (left side) in lateral view; C close-up of posterior teeth on dentary (left side) in lateral view; D close-up of upper jaw teeth from Conway et al. (2015: fig. 11I); E lower gill-arch elements in dorsal view; F upper gill-arch elements (right side) in dorsal view; G close-up of PbTP3 (left side) in ventral view; H close-up of Cb5 (left side) in dorsal view; I hyoid bar (left side) in lateral view and urohyal. Abbreviations: AC, acrodin cap; ACh, anterior ceratohyal; Ana, angulo-articular; Apa, autopalatine; Bb2–4, basibranchial 2–4; Bh, basihyal; BR, branchiostegal rays; Cb1–5, ceratobranchial 1–5; CoPr, coronoid process; DHh, dorsal hypohyal; Dn, dentary; Eb1–4, epibranchial 1–4; Ect, ectopterygoid; GR, gill rakers; Hb1–3, hypobranchial 1–3; Hy, hyomandibular; Ih, interhyal; Iop, interopercle; MC, meckel’s cartilage; Mx, maxilla; Op, opercle; PbTP3, pharyngobranchial 3 toothplate; PC, pulp cavity; PCh, posterior ceratohyal; Pmx, premaxilla; Pop, preopercle; Q, quadrate; Ra, retroarticular; RT, replacement teeth; Sop, subopercle; Sym, symplectic; Ur, urohyal.