Does anyone know a actual species of myliobatis with a similar dental plate?.
The plates are hexagonal with a high crown, 5 to 6 central rows in the upper tooth plate and 15 central rows in the lower tooth plate. The central plate is generally rectilinear and wide, wider than the lateral teeth.
I think these plates are different from existing species, for example, M. chilensis and M. peruvianus have a 3 and 2 rows of lateral teeth.
This fossil record is from Neogeno of Chile.
Couldn't it belong to Myliobatis aquila... see Hovestadt, D.C. and Hovestadt-Euler, M., 2013. Generic assessment and reallocation of Cenozoic Myliobatinae based on new information of tooth, tooth plate and caudal spine morphology of extant taxa. Palaeontos, 24: 1-66.
Hope this helps,
All the best,
Gilles
It is very difficult to adjudicate these dental plates to any specific species of Myliobatis, you can describe these as Myliobatis sp. because it looks like a very common dental morphotype or assume this material as a nominal species.
Many thanks Gilles and Cesar Laurito: I know, Hovestad (2013) concluded the same, the interspecific/generic distinction is very complicated. But, I think that the fossil dental plates from Chile are very different compared with modern species (M. aquila, M. californica, M.hamlyni, M. tobijei, M. chilensis and M. peruvianus). I would like to propose that Myliobatis from Chile is a extinct species, because dental plates present a one lateral rows, i dont dismiss a thaphonomic effect, but all dental plate have this characteristic.
what do you think?
best regards
Hola: If you have enough dental elements to make a specific distinction, go ahead, I do not know if you can analyze the radicular lamellae and the crown outline, this can be helpful in the determination of a new species.
We have a 7 dental plates, 4 caudal spine (one complete) and a lot isolated teeth.
Totally, analysis of radiacular lamellae and crow line its necessary and to identify the family in Chile.
best regards
Jaime
I do not remember if there is some Myliobatis species with only one lateral teeth, this could reinforce the possibility of taphonomic effects (If in some plate you can still check some interlocking mechanism you can confirm this). Still can be something different, do you discarded the Pteromylaeus possibility? The lower plate can match some characteristics.
My best regards,
Zoneibe L.
- Badges
- Science topic
- Similar topics
- Geoscience
- Asia
- India