The ray showed variations in its orientation that were parallel to the y − 1 axis (Fig. 1c), on the y − 1 axis (Fig. 1d), or posteriorly projecting to the y-axis (Fig. 1e) and did not pass the y − 1 axis. Adoral ciliature spirals varied from 170◦to 215◦. Spec-imens are deposited in the National Institute of AmazonianResearch (INPA), Manaus, AM, Brazil under the number 010and