2 Works

Data from: Early evolutionary trends in ammonoid embryonic development

Kenneth De Baets, Christian Klug, Dieter Korn & Neil H. Landman
During the Devonian Nekton Revolution, ammonoids show a progressive coiling of their shell just like many other pelagic mollusk groups. These now extinct, externally shelled cephalopods derived from bactritoid cephalopods with a straight shell in the Early Devonian. During the Devonian, evolutionary trends toward tighter coiling and a size reduction occurred in ammonoid embryonic shells. In at least three lineages, descendants with a closed umbilicus evolved convergently from forms with an opening in the first...

Data from: The biogeography of Sulawesi revisited: is there evidence for a vicariant origin of taxa on Wallace’s “anomalous island”?

Björn Stelbrink, Christian Albrecht, Robert Hall & Thomas Von Rintelen
Sulawesi, the largest island in the Indonesian biodiversity hotspot region Wallacea, hosts a diverse endemic fauna whose origin has been debated for more than 150 years. We use a comparative approach based on dated phylogenies and geological constraints to test the role of vicariance versus dispersal in the origin of Sulawesi taxa. Most divergence time estimates for the split of Sulawesi lineages from their sister groups postdate relevant tectonic vicariant events, suggesting that the island...

Registration Year

  • 2012
    2

Resource Types

  • Dataset
    2

Affiliations

  • Humboldt University of Berlin
    2
  • University of Zurich
    1
  • University of Giessen
    1
  • American Museum of Natural History
    1
  • University of London
    1