Class Trilobita Suborder Ptychopariina | Superfamily Ptychoparioidea | |
Similar Xystridura, Pagetia, Agnostida | ||
Penarosa is an extinct genus from a well-known class of fossil marine arthropods, the trilobites. It lived during the Middle Cambrian (Ptychagnostus atavus Zone to Ptychagnostus punctuosus Zone), approximately 505 to 500 million years ago.
References
Penarosa Wikipedia(Text) CC BY-SA