Family Opisthognathidae is a group of marine fishes, commonly known as jawfish. If you are looking for synonyms for this family, there are a few options that you can consider. One of the most commonly used synonyms is the family name Opisthognathus, which is derived from the name of the type genus. Another synonym that can be used is the family name Orthopristis, which is based on an earlier classification. However, it is important to note that while these names are used interchangeably, the family Opisthognathidae is the official name recognized by the International Commission on Zoological Nomenclature.