Chalarostylis nyx Mühlenhardt-Siegel, 2019 Fig. 28 Holotype. North Atlantic Ocean • prep. ♀; Puerto Rico Trench, Vema-TRANSIT exped., FS Sonne stat. SO 237-14 - 2; 19 ° 04.55 ' N, 67 ° 07.86 ' W [19.07583, - 67.131; 19.07783, - 67.1295]; 4934 [4935.4–4928.3] m depth; 24 January 2015; Angelika Brandt leg.; epibenthic sledge; specimen dissected; ZMH - K- 056191. Paratypes. * • ♂; Puerto Rico Trench, Vema-TRANSIT exped., FS Sonne stat. SO 237-14 - 1; 19 ° 02.08 ' N, 67 ° 09.44 ' W [19.03467, - 67.15733; 19.03517, - 67.157]; 4552 [4918.9–4921.1] m depth; 24 January 2015; Nils Brenke leg.; epibenthic sledge; specimen dissected mounted on a permanent slide; ZMH - K- 046006. * • ♂; same data as ZMH - K- 046006; ZMH - K- 046007. * • prep. ♀; same data as holotype; dissected, mounted on a permanent slide; ZMH - K- 046008. * • 1 m. + 2 prep. ♀♀; same data as holotype; ZMH - K- 046009. Diagnosis. Carapace smooth, highly vaulted dorsally in posterior part (female); pseudorostral lobes straight, unserrated. Antenna 1, article 1 without finger-like prolongation on inner distal corner. Telson length 0.8 uropod peduncle length, with 1 pair of lateral setae and 3 terminal setae (after Mühlenhardt-Siegel 2019). Distribution. North Atlantic, Puerto Rico Trench, 4934– 4552 m depth.

Published as part of Mercado-Salas, Nancy F., Mühlenhardt-Siegel, Ute, Pereira, Emanuel & Garilao, Cristina, 2026, An annotated type catalogue and a fully digitised Crustacea collection of the Museum of Nature Hamburg, Zoology. Part I: Crustacea, Malacostraca, Peracarida, Cumacea, pp. 137-193 in Evolutionary Systematics 10 (1) on pages 137-193, DOI: 10.3897/evolsyst.10.187593