Photostomias Collett, 1889

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 : 44

Photostomias Collett, 1889

Diagnosis. Photostomias can be distinguished in the Malacosteinae by the pectoral fin present only in larvae and transformed juveniles up to about 27 mm SL, absent in large juveniles and adults; pelvic-fin origin well before midlength of body, greatly elongate, 36.8–52.3% SL; 6 pelvic-fin rays, proximal ray flattened and separate from remaining five elongate rays; halves of each pelvic-fin ray fused together along their anterior margins for most of their length; pelvic fins attached near base to pelvic girdle by a thin membrane; chin barbel absent; one row of photophores on each side of isthmus (Morrow, 1964c; Fink, 1985; Kenaley, Hartel, 2005; Sutton et al., 2020). Seven valid species (Fricke et al., 2022).