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Gillicus arcuatus
Temporal range: 100–66 Ma
Late Cretaceous
Gillicus arcuatus.JPG
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Superorder: Osteoglossomorpha
Order: Ichthyodectiformes
Family: Ichthyodectidae
Subfamily: Ichthyodectinae
Genus: Gillicus
Hay, 1898
Species: G. arcuatus
Binomial name
Gillicus arcuatus
Cope, 1875

Gillicus arcuatus was a relatively small, 2-metre long ichthyodectid fish that lived in the Western Interior Seaway, in what is now central North America, during the Late Cretaceous. Like its larger relative, Ichthyodectes ctenodon, G. arcuatus had numerous small teeth lining its jaws, and ate smaller fish by sucking them into its mouth. Gillicus would also filter feed and were also eaten by their own relative, Xiphactinus. In particular, one 13 feet (4.0 m) fossil specimen was collected by George F. Sternberg with another, nearly perfectly preserved 6 feet (1.8 m) long ichthyodectid Gillicus arcuatus, inside of it. The larger fish apparently died soon after eating its prey, most likely due to the smaller fish prey struggling and rupturing an organ as it was being swallowed. This fossil can be seen at the Sternberg Museum of Natural History in Hays, Kansas.

Gillicus arcuatus within the stomach of Xiphactinus audax, George F. Sternberg's most famous fossil find.