Margrethia obtusirostra 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 : 13-14

Margrethia obtusirostra Jespersen & Tåning, 1919

( Fig. 4C )

Diagnosis. Margrethia obtusirostra differs from M. valentinae Parin, 1982 by having the last photophores of the anterior AC group above the anal-fin base (vs. last photophores of the anterior AC group behind the anal-fin base); last 2 IV displaced ventrally (vs. last 2 IV in a straight line with anterior IV) (Grey, 1964; Schaefer et al., 1986a).

Geographical distribution. Circumglobal, from 43ºN to 45ºS, except the eastern Pacific Ocean (Grey, 1964; Bordes et al., 1999; Quéro et al., 1990a; Hutchins, 2001; Moore et al., 2003; Kenaley, Stewart, 2015c; Fricke et al., 2018; Sutton et al., 2020). In the western Atlantic , known from off Canada to southern Brazil, including the Gulf of Mexico and the Caribbean Sea (Grey, 1964; Parin et al., 1974; Vinnichenko, 1997; McEachran, Fechhelm, 1998; Figueiredo et al., 2002; Harold, 2003; Judkins, Haedrich, 2018). In Brazilian waters, the species was previously reported from off Bahia to Rio de Janeiro States and off Rio Grande do Sul State (Figueiredo et al., 2002; Menezes et al., 2003; Braga et al., 2007), with additional records off the Trindade and Martin Vaz Archipelago , outside the Brazilian EEZ (Parin et al., 1974; Judkins, Haedrich, 2018). Larvae were also recorded off Rio de Janeiro State (Bonecker et al., 2012, 2014). The specimen of M. obtusirostra examined here was collected off the Rocas Atoll , at 525 m depth ( Fig. 3B ) .

Specimen examined. 1: NPM 3384, 1 (27 mm), AB1#22.

Figures

FIGURE 3 | Records of species of Diplophidae (A), Gonostomatidae (B, C) and Sternoptychidae (D, E, F) collected during the ABRACOS expeditions off northeastern Brazil. Oceanic islands: RA, Rocas Atoll; FN, Fernando de Noronha Archipelago.

FIGURE 4 | A. Gonostoma atlanticum, NPM 4615, 61 mm SL; B. Gonostoma denudatum, NPM 6519, 122 mm SL; C. Margrethia obtusirostra, NPM 3384, 27 mm SL; D. Sigmops bathyphilus, NPM 4764, 155 mm SL; E. Sigmops elongatus, NPM 3182, 173 mm SL; F. Zaphotias pedaliotus, NPM 4407, 62 mm SL. Scale bars = 10 mm.