| Family | Scientific Name | Author | Year | Common Name |
| Trichiuridae | Trichiurus lepturus | Linnaeus | 1758 | Atlantic Cutlassfish |
Trichiurus lepturus
Unique Characters: Caudal fin absent, body tapering into a hair-like process. Pelvic fins absent.
Similar Species:
Crested Scabbardfish
Lepidopus altifrons
Channel Scabbardfish
Evoxymetopon taeniatus
Crested Scabbardfish Lepidopus altifrons. Caudal fin present, small, and forked. Pelvic fins present, but strongly reduced, modified to a scale-like process (flattened spine) with 0-2 tiny soft rays. Head about 6 times in standard length, with upper profile almost straight, gently rising from tip of snout to dorsal-fin origin. Total dorsal-fin elements 90-96.
Channel Scabbardfish Evoxymetopon taeniatus. Caudal fin present, small, and forked. Pelvic fins present, but strongly reduced, modified to a scale-like process (flattened spine) with 0-2 tiny soft rays. Head about 8 times in standard length, with upper profile convex, steeply rising from tip of snout to dorsal-fin origin. Total dorsal-fin elements 81-88.
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