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

Publication Type:Journal Article
Year of Publication:In Press
Authors:Smith, AM, Taylor, PD, Milne, R
Journal:Proceedings of the International Bryozoology Association Conference, Kiel 2010
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.

Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith