Arthropods & Trilobites Meeting - Congress - Symposium
Prague, Czech Republic, and Sardinia, Italy
Summer 2012

TRILO 2012 Conference
The 5th Conference on Trilobites and their relatives, 1st July – 4th July 2012, Prague, Czech Republic

Brigitte Schoenemann

Name:Dr. Brigitte Schoenemann
Country:Germany
Institution:University of Bonn
Address:Steinmann Institut (Paläontologie)
Universität Bonn
Nussallee 8
D-53115 Bonn

E-mail:

Contributions

Sensory Structure of Phacopid Compound Eyes

B. SCHOENEMANN1 & E.N.K. CLARKSON2
Section: Palaeobiology and palaeoecology, Presentation: Oral
Trilobite, vision, eye, sensory system, compound eye
1 Steinmann Institut (Palaeontology), University of Bonn, Nussallee 8, D-53115 Bonn, Germany, bschoenem@t-online.de 2 Grant Institute, University of Edinburgh, The King´s Buildings, West Mains Road, Edinburgh EH9 3JW, UK, Euan.Clarkson@ed.ac.uk The nature of sublensar structures in trilobite eyes hitherto has remained unknown. Using x-ray ct-scanning (µ-ct) and synchrotron techniques the construction of original sensory structures in the eyes of phacopines is revealed for the first time. They are preserved as mineral coatings on the original components, and they form rosettes of cells lying within sublensar capsules. Their arrangement is very similar to that of modern apposition eyes, revealing this eye structure to have been effective since almost half a billion years. They resemble especially the apposition eyes of Limulus, which has obviously retained an ancient visual system, which successfully holds itstown today among the modern visual principles.

Colour Patterns of Devonian Trilobites

B. SCHOENEMANN1 & E.N.K. CLARKSON2
Section: Palaeobiology and palaeoecology, Presentation: Poster
Trilobite, scutelloid trilobites, phacopid trilobitess, colour pattern, carmouflage, ecology
1 Steinmann Institut (Palaeontology), University of Bonn, Nussallee 8, D-53115 Bonn, Germany, bschoenem@t-online.de 2 Grant Institute, University of Edinburgh, The King´s Buildings, West Mains Road, Edinburgh EH9 3JW, UK, Euan.Clarkson@ed.ac.uk In several specimens of Middle Devonian Scutelluid trilobites from the Rheinische Schiefergebirge colour patterns have been observed, especially on the pygidia. Two patterns have been distinguished. In the first type (Scutellum flabelliferum (Goldfuss, 1839)) a dark area around the end of the rachis on the plateau of the pygidium shows a black semicircular region, broadly corresponding to the area outlined by the inner margin of the doublure; while there is secondly a pale coloured broad band round the periphery of the pygidium. In the second form (Scutellum geesense Rud. & E. Richter, 1956 ) there is a single curving brown band along the median steepest part of the pygidial surface. These markings are shown in several specimens of each species, illustrated here. Both patterns may enable some degree of carmouflage in sunlit shallow water with a wave rippled surface. There seem to be some dark dappled splotches on the glabella of Eldredgeops rana milleri (Stewart, 1927). from New York state. Also suggestive of camouflage. .
trilo2012

NEWS


NEW PHOTOS: Participant's photos
Participant's photos

NEW PHOTOS: Sessions and dinner
Photos from sessions and the conference dinner

NEW PHOTOS: Mid-conference trip
Photos from Mid-conference field trip

NEW PHOTOS: Pre-conference trip and Icebreaker party
Photos from Pre-conference field trip and the Icebreaker party





WHEN & WHERE

26th – 29th June: Field trip
Lower Palaeozoic of the Barrandian area, Czech Rep.

1st – 4th July: Conference
Geoscience Building of the Faculty of Science of Charles University, Albertov 6, Praha 2, Prague, Czech Republic (maps)

5th – 9th July: Field trips
Sardinian Lower Palaeozoic, Italy and Late Palaeozoic in Moravia, Czech Republic




CONTACT

Oldřich Fatka
Charles University
Prague, Czech Republic

Petr Budil
Czech geological Survey
Prague, Czech Republic

Contact e-mail:
conf (at) trilo2012 (dot) org


Sponsors and organisers of the 5th International Trilobite Conference

5th International conference on Trilobites and their relatives TRILO2012, July 2012, Prag, Czech Republic | Webdesign Pavel Bokr | Logotype Radko Šarič | Ilustrations Iva Vyhnánková | savana