Rexea prometheoides

Osteichthyes Gempylidae Genus Rexea Rexea prometheoides
Royal escolar
~20 cm TL
Characteristic features:
Colour:

Head and body greyish with a silver sheen; fins pale except black blotch on anterior of first dorsal fin.

Size:

Up to 45 cm TL.

Distribution:

Indo-West Pacific in deep, tropical waters.

Habitat:

Benthopelagic, from 135 to 540 m depth.

Biology:

Feeds on fishes, crustaceans, and cephalopods.

Similar species:

Rexea bengalensis
Bengal escolar

Rexea bengalensis

Rexea bengalensis differs in being completely scaleless (vs. posterior body with a patch of scales encompassing lower lateral line); a maximum size of 20 cm SL (vs. 40 cm SL); pelvic fin spines very short in specimens >~10 cm SL (vs. short in specimens <20 cm SL, absent in specimens >20 cm SL); base of first dorsal fin 2.7 to 3.4 times longer than base of second dorsal fin (including finlets) (vs. 2.2 to 2.6 times longer) and lateral line bifurcating below 5th to 6th first dorsal-fin spine (vs. below 4th to 5th spine).

to Rexea bengalensis

Nealotus tripes
Black snake mackerel

Nealotus tripes

Nealotus tripes differs in having a single lateral line (vs. double).

to Nealotus tripes

Promethichthys prometheus
Singleline Gemfish

Promethichthys prometheus

Promethichthys prometheus differs in having a single lateral line (vs. double).

to Promethichthys prometheus
External links:

FishBase