fusulina
noun
fu·su·li·na
| \ ˌfyüzəˈlīnə, -lēnə\
Definition of fusulina
1
capitalized
: a genus (the type of the family Fusulinidae) of large fossil spindle-shaped foraminiferans having a test with 4-layered walls and deeply folded septa and serving as an index fossil in various Lower and Middle Pennsylvanian rocks
2
plural -s
: an animal or fossil of Fusulina or a related genus
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