From ZooTerms (Dictionary of Invertebrate Zoology)
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fossula (noun; plural fossulae; fossule, fossulet; Latin diminutive fossa, ditch): 1. A shallow fossa.

2. (Arthropoda: Insecta) Grooves on the head or sides of the prothorax, in which the antennae are concealed; a foveola.

3. (Mollusca: Gastropoda) A shallow linear depression of the inner lip in some Cypraeidae.