Abstract
One of the most commonly reported species in the cyclostome bryozoan family Horneridae is Hornera striata Milne Edwards, 1838. First described from the Pliocene Coralline Crag of Suffolk in England, it has since been reported from many European fossil localities. It has also been recorded from the Tertiary and Recent of New Zealand. Here we revise H. striata and some other non-fenestrate species of Hornera described by Busk (1859) and Mongereau (1972) from the Coralline Crag. Hornera lagaaiji Mongereau, 1972 from the Coralline Crag has autozooidal apertures more distantly spaced than H. striata but is otherwise very similar to this species and is placed into synonymy, as are Coralline Crag specimens identified by Busk (1859) as H. frondiculata Lamouroux, 1821. Another Coralline Crag species, H. humilis Busk, 1859, is characterized by small colony and zooid size, and is also unusual in having autozooids opening on the outside of the cone of branches. No gonozooids have been found in any of the Coralline Crag species of Hornera, despite a high incidence of colony bases implying recruitment from larvae rather than through clonal fragmentation. Recent records of H. striata from New Zealand appear to represent misidentifications of Hornera robusta MacGillivray, 1883, while the first report of this British species from New Zealand, from the Miocene Orakei Greensand Member, is provisionally assigned to H. lunularis Stoliczka, 1865.
Rory Milne died on 24th April 2011 while this article was in press.
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Acknowledgements
Andreas Kroh (Vienna) kindly allowed one of us (PDT) to study material of Hornera and other bryozoans in the Stoliczka Collection. John Simes and Chris Hollis allowed examination and SEM (by AMS) of Hornera from the GNS Science collections in Lower Hutt, New Zealand. We also acknowledge assistance from Liz Girvan (Otago Centre for Electron Microscopy), and Mary Spencer Jones and Vicki Holmes (Department of Zoology, NHM).
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Smith, A.M., Taylor, P.D., Milne, R. (2013). Hornera striata (Milne Edwards, 1838), a British Pliocene Cyclostome Bryozoan Incorrectly Recorded from New Zealand, with Notes on Some Non-fenestrate Hornera from the Coralline Crag. 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_23
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