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Development of the tentacles and food groove in the jellyfish Aurelia aurita (Cnidaria: Scyphozoa)

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Abstract:

The development of the tentacle-bearing part of the rim of the jellyfish Aurelia aurita is described. The newly liberated ephyra lacks appendages at the bell rim between the rhopalial arms (null stage). The next stage (bump stage) has a subumbrellar bump near the rim. The bump then forms a tongue process (tongue stage) on its adoral side. The aboral part of the bump becomes the primordium of the tentacle. The tongue process elongates and spreads circumferentially, finally melding with the lappets of the rhopalial arms. Next the tongue process develops a groove that spreads laterally. The epithelium of the groove becomes glandular and serves as a food groove where particulate matter such as plankton is concentrated and undergoes the initial phase of digestion. The "upper" side of the split tongue process becomes the floor of the tentacle chambers, while the "lower" side becomes the pseudovelarium. The growth and differentiation zone for the medusa's rim is at the junction of the tentaculate part of the rim with the rhopalial region. It is here that tentacle buds form, followed by intertentacular lappets (partitions).

On trouvera ici la description du développement de la bordure de l'ombrelle où s'insèrent les tentacules chez la méduse Aurelia aurita. Au moment de sa libération, l'éphyrule ne porte pas de tentacules en bordure de l'ombrelle entre les bras rhopaliens (stade nul). Au stade suivant (stade bosse), apparaît une bosse sur la surface inférieure de l'ombrelle près de la bordure. Il se forme ensuite un processus en forme de langue du côté adoral de la bosse (stade langue). La partie aborale de la bosse devient le primordium des tentacules. Le processus s'allonge et s'étale en périphérie pour finalement se confondre avec les pans des bras rhopaliens. Le processus se creuse ensuite d'un sillon qui s'étend latéralement. L'épithélium du sillon devient glandulaire et sert de gouttière alimentaire où les particules, telles que les organismes planctoniques, se concentrent et commencent à être digérées. La partie « supérieure » du processus divisé devient le plancher des chambres tentaculaires et la partie « inférieure » devient le pseudovelarium. La zone de croissance et différenciation de la bordure de l'ombrelle se trouve à la jonction des zones tentaculaire et rhopaliennne. C'est là qu'apparaissent les bourgeons des tentacules et que se formeront par la suite les pans intertentaculaires (cloisons).

Document Type: Research Article

Publication date: April 1, 2001

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  • Published since 1929, this monthly journal reports on primary research contributed by respected international scientists in the broad field of zoology, including behaviour, biochemistry and physiology, developmental biology, ecology, genetics, morphology and ultrastructure, parasitology and pathology, and systematics and evolution. It also invites experts to submit review articles on topics of current interest.
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nrc/cjz/2001/00000079/00000004/art00011
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