goniatite
Concise Oxford English Dictionary © 2008 Oxford University Press:
goniatite /ˈgəʊnɪətʌɪt/
▶noun Palaeontology an ammonoid fossil of an early type with simple angular suture lines.
– origin C19: from mod. L. Goniatites, from Gk gōnia ‘angle’.
'goniatite' also found in these Oxford entries:

