 The dentition is similar in morphology between the two groups, with the exception of the deciduous lower third premolar varying from one genus to the next.The similarity between the two continues to cause the genus "Marmosops" to be frequently misidentified due to the lack of knowledge regarding the species along with the overlooked traits that help separate them from other opossums.The "Marmosops" are also commonly confused with the genus "Gracilinanus", but this is quickly ruled out by a large number of differing characteristics.