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The Genus Sparsiporina d’Orbigny, 1852 (Bryozoa, Cheilostomata): Late Eocene to Holocene

The Genus Sparsiporina d’Orbigny

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Bryozoan Studies 2010

Part of the book series: Lecture Notes in Earth System Sciences ((LNESS,volume 143))

Abstract

Sparsiporina elegans (Reuss, 1848), type species of the Phydoloporidae genus Sparsiporina, typical of late Eocene to early Oligocene sediments from northern Italy and central Europe, is redescribed mostly based on topotype material. A second species is recognised as belonging to the same genus, S. ramulosa (Calvet 1906), first described from doubtfully living material from the Capo Verde Islands and now found to be relatively common in Gelasian sediments from Southern Italy. The two species show close similarities in zooid morphology, zooid arrangement along the branches and growth form, but differ mostly in the morphology of the avicularia, the morphology and location of the ovicells and the zooidal dimensions. The stratigraphical and geographical distributions of both species included in the genus are discussed, as well as their ecological requirements, which probably changed slightly during geological time.

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Acknowledgements

D. Gordon (NIWA) is thanked for discussions and for making available photos of some topotypes of S. elegans. Photos of the types of this species were kindly supplied by N. Vávra (Department of Paleontology, Vienna) whereas those of S. ramulosa were made available by P. Louzet (MNHN, Paris). J.-L. d’Hondt and J.-G. Harmelin are kindly acknowledged for information about S. ramulosa, A. Viola (Scienze Biologiche, Geologiche e Ambientali, Catania) for SEM analysis, S. Castelli and L. Franceschin (Dipartimento di Geoscienze, Padova University) for the composition of Fig. 18.1 and laboratory assistance. A special thank is due to N Vávra and P Moissette (Université Claude Bernard, Lyon) for reviewing the manuscript. Research was funded by Catania PRA grants to A. Rosso. Catania Palaeontological Research Group: contribution number 371.

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Rosso, A., Braga, G. (2013). The Genus Sparsiporina d’Orbigny, 1852 (Bryozoa, Cheilostomata): Late Eocene to Holocene. In: Ernst, A., Schäfer, P., Scholz, J. (eds) Bryozoan Studies 2010. Lecture Notes in Earth System Sciences, vol 143. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-16411-8_18

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