Promethichthys prometheus

FamilyScientific NameAuthorYearCommon Name
GempylidaePromethichthys prometheus(Cuvier)1832Roudi Escolar

Promethichthys prometheus

Unique Character: Dorsal-fin elements, including finlets, less than 55. Distance from anus to anal-fin origin much shorter than snout length, about equal to eye diameter. Caudal peduncle without keels. Dorsal-fin spines 17 or 18. Lateral line single, but not sinuous. Skin moderately smooth, scales small, not interspersed with spinous bony tubercles. No midventral keel on belly. One lateral line. 2 finlets behind both dorsal and anal fins. Pelvic fins rudimentary, of a single spine. Body depth 6.5-9 times in standard length. No free anal fin behind anus. Lateral line curved abruptly downward anteriorly.

Similar Species:

Black Gemfish
Nesiarchus nasutus

Black Snake Mackerel
Nealotus tripes

Black Gemfish Nesiarchus nasutus. Dorsal-fin elements, including finlets, less than 55. Distance from anus to anal-fin origin much shorter than snout length, about equal to eye diameter. Caudal peduncle without keels. Dorsal-fin spines 17-21. Lateral line single, but not sinuous. Skin moderately smooth, scales small, not interspersed with spinous bony tubercles. No midventral keel on belly. One lateral line. 2 finlets behind both dorsal and anal fins. Body depth less than 10-13 times in standard length. Pelvic fins well developed, with 1 spine and 5 soft rays.

Black Snake Mackerel Nealotus tripes. Dorsal-fin elements, including finlets, less than 55. Distance from anus to anal-fin origin much shorter than snout length, about equal to eye diameter. Caudal peduncle without keels. Dorsal-fin spines 20 or 21. Lateral line single, but not sinuous. Skin moderately smooth, scales small, not interspersed with spinous bony tubercles. No midventral keel on belly. One lateral line. 2 finlets behind both dorsal and anal fins. Pelvic fins rudimentary, of a single spine. Body depth 6.5-9 times in standard length. Two free anal-fin spines behind anus, first of them large, dagger-shaped. Lateral line fairly straight.

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