Rostrum of the green apple jug (Lygocoris pabulinus) well visible
The term rostrum (of Latin rostrum, meaning "beak") is used for a number of unrelated structures in different groups of animals. It may be the snout of mammals, fish or other animals as arthropods.
In the bushes the rostrum is meant to be the stingrays of, among others, the wantons (subterranean Heteroptera). The rostrum consists of a single tube, which however is formed of paired mouthpieces that have joined together. The rostrum is comparable to the butterfly proboscis, but it is immobile. The pointed snout of snout beetles is also often called rostrum.
In crustaceans, the rostrum is the pointed, forward protruding part of the carapax, between the eyes.
Abdomen also has a rostrum or proboscis and the beaky mouthpieces of some squid (Cephalopoda) are often also called rostrum.
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