Aphanopus and Trichiurus

Aphanopus carbo (Lowe 1839, up to 1.1m) is the extant black scabbardfish, close to the eel-like cutlassfish. The body is extremely elongate with an odd little diphycercal tail. The pelvic fins are vestiges in juveniles, absent in adults. The premaxilla have fangs and are ventrally concave.

Trichiurus lepturus (Linneaus 1758, 2.3m) is the largehad hairtail, a type of cutlass fish. The pelvic fins are gone. So is the caudal fin.

Linnaeus C 1758. Systema naturæ per regna tria naturæ, secundum classes, ordines, genera, species, cum characteribus, differentiis, synonymis, locis. Tomus I. Editio decima, reformata.

Lowe RT 1839. A supplement to a synopsis of the fishes of Madeira. Proceedings of the Zoological Society of London, 7: 76–92.

wiki/Black_scabbardfish
wiki/Trichiurus

Actinista

Latimeria

Lepisosteiformes

Gavinia

Lepisosteus

Robustichthys

Prionotus

Amiiformes

Prohalecites

Amia