Anatosuchus ("duck crocodile", the name from the Latin anas ("duck") and the Greek souchos ("crocodile"), for the broad, duck-like snout) is an extinct genus of notosuchian crocodyliforms discovered in Gadoufaoua, Niger, and described by a team of palaeontologists led by the American Paul Sereno in 2003, in the Journal of Vertebrate Paleontology.

Differences in the skull indicate that the unusual broad, flattened shape developed as the animal grew older.

[2] The premaxillae are broad and flat, and form a line straight across the front of Anatosuchus's snout; each holds six recurved teeth which point backwards into the mouth.

The internarial processes of the premaxillae taper steeply up towards the projecting nasals; they begin as very wide, meaning that the external nares are dorsoventrally compressed.

[2] The maxillae are, by quite a long way, the largest and most expansive bones in the skull; each holds nineteen small recurved teeth.

The upper of these rami form a long suture with the nasal, and then meet the prefrontal and lacrimal directly above the antorbital fenestra.

The prefrontal bones are shaped rather like a stylised capital I, wider at each of the ends, and effectively separate the nasals and lacrimals.

The frontal-parietal suture is strong and highly interdigitating; although the frontals bear a medial crest, the parietal skull table is flat save for the deep pits across it.

The supraoccipitals are small and triangular, with a short vertical nuchal keel on the occiput; large flanges extend off this to each side.

Each side of the skull has three Eustachian foramina present - two on each basioccipital, one anterior and one posterior, and one between basisphenoid and otoccipital in the basal tuber.

The articular has a glenoid for the quadrate condyles; it is saddle-shaped, with no anterior or posterior lip, although there is a prominent attachment crest posteroventral to the jaw joint.

[2] The teeth have subconical crowns that curve in towards the centre of the mouth; all are fairly small and not very worn, indicating relatively little use.

The proatlas is an inverted V-shaped piece of bone with a dorsal keel and is quite large relative to the atlas, which is made up of two separate neural arches.

Dorsal ribs bend ventrally after they clear the osteoderm shield, forming a slight flange along the anterior margin; the ones closer to the posterior end have only one head.

The radii have strongly flared proximal ends, and are noticeably shorter than the ulnae since these extend along the edges of the radiales.

[2] In the initial description of Anatosuchus, it formed a clade with Comahuesuchus, within a less inclusive Notosuchia, also found to be monophyletic.