From ZooTerms (Dictionary of Invertebrate Zoology)
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rostellum also rostel (noun; Latin rostellum, small beak): 1. A small beak or rostrum.

2. (Arthropoda: Insecta) The tubular piercing and sucking mouth parts.

3. (Brachiopoda) Low projection between anterior muscle scars to which internal oblique muscles are attached.

4. (Platyhelminthes: Cestoda) A rounded prominence on the anterior end of the scolex, often furnished with retractile spines or hooks; sometimes referred to as an aclid organ.

5. (Platyhelminthes: Trematoda) An anterior holdfast

See also: rhynchus