Lampris, Retzius, 1799

Underkoffler, Karen E., Luers, Meagan A., Hyde, John R. & Craig, Matthew T., 2018, A taxonomic review of Lampris guttatus (Brünnich 1788) (Lampridiformes; Lampridae) with descriptions of three new species, Zootaxa 4413 (3), pp. 551-565 : 556

Key to the specie of Lampris

1a. Body much longer than deep, its maximum depth contained ≥ 1.8 times in standard length; anal-fin rays <38; head and body without spots........................................................................ Lampris immaculatus

1b. Body approaching circular, its maximum depth contained ≤ 1.5 times in standard length (except in L. guttatus ); anal-fin rays ≥ 38; head and/or body with spots.......................................................................... 2

2a. Origin of pelvic fin below or posterior to middle of elongated portion of dorsal fin; maximum body depth 1.5–1.8 times in standard length; length of anal-fin base> 3.0 times in standard length; dorsal fin short, its height contained 2.5 times in standard length; white spots on body oblong, well-spaced, and small, roughly 1/4 pupil diameter; few or no spots on chest, head, or operculum................................................................................... L. guttatus

2b. Origin of pelvic fin below or anterior to middle of elongated portion of dorsal fin; maximum body depth ≤ 1.5 times in standard length; length of anal-fin base <3.0 times in standard length; dorsal-fin height contained less than 4.0 times in standard length; white spots on body irregular or mostly circular; numerous spots on chest, head, and operculum................. 3

3a. Dorsal-fin rays> 53; head depth> 2.5 times in standard length; spots on body large, ovoid, and irregular often extending well onto anal fin..................................................................................... L. lauta

3b. Dorsal-fin rays ≤ 53; head depth <2.5 times in standard length; spots on body not as described above................... 4

4a. Dorsal profile of head distinctly arched (convex); spots on body mostly circular, largest about size of pupil; posterior edges of median fins often tinged with yellow...................................................... L. australensis n. sp.

4b. Dorsal profile of head flat; spots on body mostly circular, largest distinctly smaller than pupil and densely concentrated.... 5

5a. Horizontal eye diameter <30% head length; dorsal-fin height on average 21.3% of fork length; pelvic-fin length on average 24.5% of fork length.................................................................... L. incognitus n. sp.

5b. Horizontal eye diameter> 30% head length; dorsal-fin height on average 26.3% of fork length; pelvic-fin length on average 33.6% of fork length.................................................................... L. megalopsis n. sp.