| Family | Scientific Name | Author | Year | Common Name |
| Paralepididae | Stemonosudis rothschildi | Richards | 1967 | Longsnout Pikesmelt |
All Stemonosudis Species: Pectoral fins short, longest fin ray shorter than anal-fin base. Large mandibular teeth fixed or flexible and with smooth edges. Pelvic-fin origins well in front of a vertical from first dorsal-fin ray (by at least one length of dorsal-fin base). No luminous tissue on belly; no black spot before eye. Dorsal-fin rays 8-10. Ventral adipose fin between vent and anal fin present. Anal-fin rays 35 or more. Color light, some with saddle-like blotches dorsally.
Stemonosudis rothschildi
Unique Characteristics: 5 dorsal blotches in advance of the dorsal fin. Anal-fin rays 33 (Richards 1967).
Similar Species:
Stemonosudis intermedia, Multibone Pikesmelt
Multibone Pikesmelt, Stemonosudis intermedia. Anteriormost ventral saddle-like patch a continuation of the peritoneal pigment sections; peritoneal pigment sections 16-17. 7-8 saddle-like blotches dorsally and ventrally behind dorsal fin. Anal-fin rays 42-48 (FAO 2020).
References:
(FAO 2020) Sutton, T.T., P.A. Hulley, R. Wienerroither, D. Zaera-Perez, and J.R. Paxton. 2020. Identification guide to the mesopelagic fishes of the central and south east Atlantic Ocean. FAO Species Identification Guide for Fishery Purposes. Rome, FAO. 2020. https://doi.org/10.4060/cb0365en.
Richards, W.J. 1967. Stemonosudis rothschildi, a new Paralepidid fish from the Central Pacific. California Fish and Game, 53(1):35-39.