1 A forward projection or extension of the snout (e.g. of a fish). The typical profile of an oceanic shark reveals a massive rostrum projecting well forward and above the low-slung mouth.
2 The snout-like extension to the head that forms the specialized piercing and sucking mouth-parts of the Hemiptera (true bugs). The stylets are sheathed by the labrum, which forms a jointed tube closed dorsally at the base by the labrum. In feeding, only the stylets enter the tissues of the host plant or prey.
3 In prawns, a spine-like extension of the cephalothorax.
4 (guard) In Belemnitida, a massive deposit of fibrous calcite.
5 In Brachiopoda, a beak-like process on the umbo.
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