Does Anyone know if the presence of foramina within the longitudinal grooves on ungual claws is common in any type of dinosaurs? The mention of these foramina is rare in the literature (e.g. in a Theropod from France related to Allosaurus: Pérez-Moreno et al., 1993), but I have the doubt if it is that they are usually absent or that the authors do not bother to describe them. Thanks in advance!