Margrethia Jespersen & Tåning, 1919

Villarins, Bárbara T., Dario, Fabio Di, Eduardo, Leandro N., Lucena-Frédou, Flávia, Bertrand, Arnaud, Prokofiev, Artem M. & Mincarone, Michael M., 2022, Deep-sea dragonfishes (Teleostei: Stomiiformes) collected from off northeastern Brazil, with a review of the species reported from the Brazilian Exclusive Economic Zone, Neotropical Ichthyology (e 220004) 20 (2), pp. 1-78 : 13

Margrethia Jespersen & Tåning, 1919

Diagnosis. Margrethia can be distinguished in the Gonostomatidae by the presence of adipose fin; dorsal-fin origin in advance of anal-fin origin; anterior rays of the dorsal- and anal-fin elongated; 14–16 pectoral-fin rays; 15–16 dorsal-fin rays; 21–26 anal-fin rays; no photophores on isthmus; a single row of large and irregular ventral photophores; SO absent; BR 10–13; OP 3; IV 13–16; AC 13–17 (Grey, 1964; Mukhacheva, 1976; Schaefer et al., 1986a). Two valid species (Fricke et al., 2022).