Nidamental gland
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Nidamental glands are internal organs found in some elasmobranchs and certain molluscs, including cephalopods (specifically Decapodiformes and nautiluses) and gastropods.[1][2][3]
In cephalopods, nidamental glands are large, paired glandular structures found in the mantle cavity.[4] Accessory nidamental glands may also be present.[4] Nidamental glands are composed of lamellae and are involved in the secretion of egg cases or the gelatinous substance comprising egg masses.[1]
They are also found in phoronids.[5]