High Quality Content by WIKIPEDIA articles! Rhynchonkos is an extinct genus of microsaur. It is the only member of the family Goniorhynchidae. Originally known as Goniorhynchus, it was renamed in 1981. The type and only species is R. stovalli, found from the Early Permian Hennesey Formation in Cleveland County, Oklahoma.Rhynchonkos shares many similarities with Eocaecilia, an early caecilian from the Early Jurassic of Arizona. The close similarity between Rhynchonkos and Eocaecilia may be an indication that caecilians are descendants of microsaurs. However, such a relationship is no longer widely accepted.