From ZooTerms (Dictionary of Invertebrate Zoology)
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scutellum (noun; plural scutella; Latin diminutive scutum, shield): 1. (Arthropoda: Insecta) a. A sclerotic subdivision of the thoracic notum. b. In Coleoptera, Hemiptera, and Homoptera, the scutellum (mesoscutellum); large and usually triangular or subtriangular. c. In Diptera, a posterior rounded or triangular lobe.

2. (NEMATA: Secernentea) One of a pair of large caudal chemosensory organs opening in the lateral fields in some species of the Hoplolaiminae.