angustisellate

adjective
an·​gus·​ti·​sel·​late

Definition of angustisellate 

paleontology

: having sutures in which there are a prominent ventral saddle, deep lateral lobes, and deep umbilical saddles used of a stage in the development of the ammonoid shell

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First Known Use of angustisellate

1884, in the meaning defined above

History and Etymology for angustisellate

angusti- + sellate

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The first known use of angustisellate was in 1884

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