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Investigation of the budding process in Tethya citrina and Tethya aurantium (Porifera, Demospongiae)

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Abstract

The budding process has been studied in two congeneric Mediterranean species belonging to Tethya from different sampling sites: Marsala and Venice Lagoons (Tethya citrina); Marsala Lagoon and Porto Cesareo Basin (Tethya aurantium). Buds, connected to the adult by a spiculated stalk, differ between the two species in morphology and size, since those of T. citrina are small with elongated bodies, showing only a few spicules protruding from the apical region, whereas those of T. aurantium are round, larger, and show spicules radiating from the peripheral border. In T. citrina, cells with inclusions, varying in electron density and size, represent the main cell types of the buds. In T. aurantium, the cell component shows a major diversification, resulting from spherulous cells, grey cells, vacuolar cells and peculiar micro-vesicle cells. Neither canals nor choanocyte chambers were observed in the buds of the two species. In T. citrina, bud production is similar in both sampling sites. In T. aurantium, budding occurs more rarely in Porto Cesareo Basin, probably in relation with environmental factors, such as the covering of the cortex by sediment and micro-algae. Finally, in the buds of both species, the spicule size does not differ from that of the cortex of the adult sponges, further supporting the main involvement of the cortex in organizing the skeletal architecture of the buds.

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Authors and Affiliations

  1. Dipartimento di Zoologia dell’Università, Via Orabona 4, 70125, Bari, Italy

    Lidia Scalera Liaci, Margherita Sciscioli & Giuseppe Corriero

  2. Dipartimento di Biolgia Cellulare ed Ambientale, Via Elce di Sotto, 06123, Perugia, Italy

    Elda Gaino

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  1. Elda Gaino
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  2. Lidia Scalera Liaci
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  3. Margherita Sciscioli
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  4. Giuseppe Corriero
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Correspondence to Giuseppe Corriero.

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Gaino, E., Scalera Liaci, L., Sciscioli, M. et al. Investigation of the budding process in Tethya citrina and Tethya aurantium (Porifera, Demospongiae). Zoomorphology 125, 87–97 (2006). https://doi.org/10.1007/s00435-006-0015-z

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