[Radiolaria Phaeodaria] See astropyle.

[Cubo-/Scyphomedusae] of a scyphistoma, the mound on which the mouth is situated.

[Polychaeta] Eversible, non-muscular part of the pharynx (strictly); often used interchangeably with pharynx.

[Pteropoda] Usually elongated part of the mouth and esophagus with or without buccal organs (Pneumodermopsis in ventral view).

Alternative form for Proboscis : [Polychaeta] Proboscides.