A rare form of frontal shield development in the new cheilostome bryozoan genusUharella from the Eocene of Antarctica |
| |
| Authors: | Paul D Taylor Silvio Casadío Dennis P Gordon |
| |
| Institution: | (1) Department of Palaeontology, Natural History Museum, Cromwell Road, SW7 5BD London, U.K.;(2) Facultad de Ciencias Exactas y Naturales, Uruguay 151, 6300 Santa Rosa, La Pampa, Argentina;(3) Aquatic Biodiversity & Biosecurity, National Institute of Water & Atmospheric Research, Private Bag 14-901 Kilbirnie, Wellington, New Zealand |
| |
| Abstract: | A new cheilostome bryozoan,Uharella seymourensis n. gen., n. sp., is described from the Eocene of Seymour Island, Antarctic Peninsula. Colonies ofU. seymourensis encrust lithoclasts, locally in high densities with 1–2 mm-wide strips of unencrusted substrate between neighbouring colonies.
This unusual patterning could indicate chemical defence against encroaching colonies or may have resulted from grazing.U. seymourensis is an ascophoran-grade cheilostome with an unusual umbonuloid frontal shield apparently derived entirely or in part from
kenozooidal overgrowth. The most closely related genus appears to be the European Maastrichtian and Danian genusBrydonella
Berthelsen, 1962 with whichUharella is here united in Brydonellidae n. fam.
|
| |
| Keywords: | Bryozoa Cheilostomata Eocene Antarctica Brydonellidae n fam Uharella n gen palaeoecology |
| 本文献已被 SpringerLink 等数据库收录！ |
|
