Pentamerus

noun
Pen·​tam·​er·​us | \pen‧ˈtamərəs\

Definition of Pentamerus 

: a genus (the type of the family Pentameridae) comprising Paleozoic brachiopods of the order Protremata abundant in the Silurian and having the shell rostrate and oval or somewhat pentagonal with its cavity divided by two internal vertical ridges and a spondylium in each valve

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History and Etymology for Pentamerus

New Latin, from penta- (from Greek) + -merus -merous

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