21169 - Top Rare Anomalocaridid Aegirocassis benmoulai filter feeding appendage Ordovician Coloborhynchus Impressive partial Spinosaurus ilium pelvic

Impressive partial Spinosaurus ilium pelvic bone

with each oxygen being shared between two tetrahedra

Striatolamia macrota: Fossilworks (Paleobiology Database)

Errachidia province

21169 - Top Rare Anomalocaridid Aegirocassis benmoulai filter feeding appendage Ordovician Coloborhynchus Impressive partial Spinosaurus ilium pelvicTop rare filter feeding appendage of the anomalocaridid Aegirocassis benmoulai Aegirocassis is an extinct genus of anomalocarid arthropod belonging to the family Hurdiidae that lived 480 million years ago during the early Ordovician. It is known by a single species, Aegirocassis benmoulai. A fossil of A. benmoulai from the Fezouata biota, Morocco was discovered by and named after Mohamed Ben Moula, a fossil collector who recognized its rare