osculum

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osculum

[′äs·kyə·ləm]
(invertebrate zoology)
An excurrent orifice in Porifera.
References in periodicals archive ?
Tubes are wider at the apex, having an elongated, bean-shaped apical oscule, up to 17 mm in diameter, sometimes divided.
Underwater it looks red with whitish scattered oscules.
Surface uneven, with low tubercules surrounded by vein-like branching surface canals, white in color, converging towards the scattered oscules.