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Rostrum


[R] Proboscis-like structure extending from the head and bearing the mouthparts in weevils (Curculionidae).
In the Heteroptera and Homoptera, the rostrum acts as a guide to the piercing stylets (these penetrate plant tissues) are withdrawn into it when not used (except in scale insects).
In certain mites, the propodosoma bears a rostrum enclosing the long and perforating chelicerae.

[R] Images

* Curculionidae: head and rostrum (INRA)
1:.
a: rostrum; b: antenna; c: compound eye.
2: tip of the rostrum (ventral view).
a: mandible; b: maxillary palpus; c: labium and labial palpi.
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* Aphid rostrum (Aphidoidea) (INRA)
Ventral view.
Rostrum at rest between fore and mid coxae.
a: rostrum; b: antenna (sectionned); c: compound eye; d: fore leg and mid leg.
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* Bug rostrum (Hemiptera) (INRA)
a: insertion of the antenna; b: compound eye; c: labrum; d: rostrum (modified labium); e: mandibulary stylets; f: maxillary stylets (in e and f, stylets were extracted out of the rostrum).
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