Vidria vespa is a proetid trilobite belonging to the family Phillipsiidae. The fossils are found in Middle Permian-aged marine strata of Western Texas. It is unique among Permian-aged trilobites in having a posterior spine emanating from the pygidium of the adult (two such posterior spines are present in immature individuals).[1]

References

  1. ^ a b Weller, J. Marvin. "Permian trilobite genera." Journal of Paleontology (1944): 320-327.
  • Proetida fact sheet [1]


Allikas: https://en.wikipedia.org/wiki/Vidria
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