From ZooTerms (Dictionary of Invertebrate Zoology)
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obturaculum (noun; Latin diminutive obturare, to plug or close): (Arthropoda: Insecta) In Anoplura, a connective-like tissue structure that divides the hemocoel of the head from the thoracic hemocoel; continuous posteriorly with a heavy coat surrounding the thoracic ganglia; neck-plug.