The specific name, werneri, is in honor of Austrian herpetologist Franz Werner.

[2] The species I. werneri is monotypic within the genus Iguanognathus.

[3] I. werneri is known only from the holotype, which was collected in Sumatra, Indonesia.

[1] All the teeth of I. werneri (mandibular, maxillary, and palatal) have spatulate crowns, which are ribbed along the outer side.

This article relating to Natricinae is a stub.