Abstract

A new species of the halecomorph fish †Tomognathus, †T. gigeri, is described on the basis of an isolated piece of a snout found in the Valanginian in the vicinity of Toulon, southeast France. Although very fragmentary, the specimen shows several of the very specialized characters of †Tomognathus, such as fused premaxillae with a posterior ventral process that sutures with an unpaired vomer, a blunt stout, a compound ethmoid ossification with no distinct lateral ethmoid and pre-ethmoid, as well as large, hollow teeth with a thin wall. Several characters, however, clearly indicate that the specimen represents a new species, which is 40 million years older than the type species (Valanginian and Cenomanian respectively). †Tomognathus had a debated systematic status for more than a century, and its placement within the halecomorphs is recent. Characters of the new species confirm this assignment, in particular the carinate shape of the acrodine tips of its teeth, which differs from those of the type species, but is similar to the teeth of the halecomorph superfamily Caturoidea.