Leucon brevirostratis Mühlenhardt-Siegel, 2025Holotype.South Atlantic Ocean • ovig. ♀; Argentine Basin; DIVA III exped. FS Meteor; stat. M 79 / 1-534; 36°0.61'S, 49°01.54'W [- 36.01017, - 49.02567; - 36.01150, - 49.02900]; 4608 [4607.8–4605.1] m depth; 16 July 2009; Pedro Martínez Arbizu leg.; epibenthic sledge; ZMH -K-064955.Paratypes.* • 5 ovig. ♀♀; same data as holotype; one specimen dissected; ZMH -K-064956. * • 2 m. + ♂ + juv. ♂ + 2 subA. ♂♂ + 6 non-ovig. ♀♀; Argentine Basin, DIVA III exped., FS Meteor stat. M 79 / 1-532; 35°59.16'S, 49°0.75'W [- 35.986, - 49.0125; - 35.98733, - 49.01483]; 4605 [4604.5–4605.4] m depth; 15 July 2009; Pedro Martínez Arbizu leg.; epibenthic sledge; ZMH -K-064994. * • 8 m. + ♂ + juv. ♂ + 6 subA. ♂♂ + 4 ovig. ♀♀ + 17 non-ovig. ♀♀; Argentine Basin; DIVA III exped. FS Meteor; stat. M 79 / 1-533; 36°0.20'S, 49°01.96'W [- 36.00333, - 49.03267; - 36.00450, - 49.03533]; 4602 [4601.8–4605.7] m depth; 15 July 2009; Pedro Martínez Arbizu leg.; epibenthic sledge; ZMH -K-064995. * • 22 m. + juv. ♂ + 9 subA. ♂♂ + 9 ♂♂ + 32 non-ovig. ♀♀; same data as holotype; ZMH -K-064996. * • subA. ♂; Brazil Basin; DIVA III exped., FS Meteor stat. M 79 / 1-604; 03°57.67'S, 28°05.36'W [- 3.96117, - 28.08700; - 3.96183, - 28.08933] 5180 [5179.8–5232.8] m depth; 05 August 2009; Pedro Martínez Arbizu leg.; epibenthic sledge; ZMH -K-064997.Diagnosis.Carapace with anterior margin serrate above antennal notch, dorsomedian line serrate to the end; antennal notch triangular and small. Maxilliped and pereopod 1–3, exopods with teeth (female) (after Mühlenhardt-Siegel 2025).Distribution.Southwest Atlantic, Argentine and Brazil Basins, 4602–5180 m depth.