Rostrum (from Latin rostrum, meaning beak) is a term used in anatomy for several kinds of hard, beak-like structures projecting out from the head or mouth of an animal. Despite some visual similarity, many of these are phylogenetically unrelated structures in widely varying species.

A snout is the protruding portion of an animal's face, consisting of its nose, mouth, and jaw. In many animals, the structure is called a muzzle, [1] rostrum, beak or proboscis.

2018年2月27日 · The term rostrum is defined as an organism’s beak or a beak-like part. The term is used in reference to cetaceans, crustaceans and some fish. The plural form of this word is rostra. In cetaceans, the rostrum is the upper jaw or “snout” of the whale.

In mammals, the rostrum is that part of the cranium located in front of the zygomatic arches, where it holds the teeth, palate, and nasal cavity. The beak or snout of a vertebrate may also be referred to as the rostrum.

2023年5月29日 · (1) A beak-like or snout-like projection, such as that of the crocodile or dolphin, or the beak of birds. (2) The beak or sucking mouth parts, especially of hemiptera. (3) The …

In sawfish …dangerous, but their saws (or rostrums), constituting as much as one-third their total length, can be formidable. The saws are used in feeding, in digging out bottom animals, and, when lashed about, in killing or maiming schooling fishes. These structures also contain electroreceptors called ampullae of Lorenzini, which can detect…

The beak, or rostrum, serves as a vital external anatomical structure in birds, fulfilling various functions such as eating, preening, manipulating objects, hunting, probing for food, courtship displays, and feeding young.

2019年1月29日 · To help in identifying a mammal skull, it is important to know that a mammal skull has four general regions: the rostrum, zygomatic arches, braincase and mandibles.

The sphenoidal rostrum is a kind of sting formed by the body of the presphenoid bone dorsally to the median wall (Septum sinuum sphenoidalium) that separates the two sphenoidal sinuses. It is continued by the perpendicular plate of the ethmoid bone.

Rostrum: Anteriorly each valve is developed into a rostrum that overlies and protects the first antennae and frontal organ. The rostrum is produced into a long process in some species (e.g. Conchoecilla daphnoides ), but reduced almost completely in others (e.g. Halocypris spp).