Acestrus

Acestrus
Temporal range:
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Istiophoriformes (?)
Genus: †Acestrus
Woodward, 1901
Species:
†A. ornatus
Binomial name
†Acestrus ornatus
Woodward, 1901

Acestrus is an extinct genus of marine ray-finned fish that lived during the lower Eocene in Europe. It contains one species, A. ornatus from the London Clay, known from a single braincase. It is thought to possibly be closely allied with billfish based on the braincase morphology, although it remains uncertain whether it had the rostrum characteristic of billfishes. Some authorities have suggested blochiid affinities.

The former species "A. elongatus" Casier, 1966 is now thought to be remains assigned to Duplexdens.

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