The paleontology of rostroconch mollusks and the early history of the phylum Mollusca

  title={The paleontology of rostroconch mollusks and the early history of the phylum Mollusca},
  author={John Pojeta and Bruce Runnegar},
_______________. Introduction _______________. Acknowledgments __________. Functional morphology _______. Orientation ________________. Larval shell __________ Metamorphosis ___________. Subsequent shell growth _____. Summary of shell growth ___ Opening of the valves ____. Musculature ________________. Pedal musculature ______. Pallial musculature ________ Alimentary canal _______. Feeding structures _____________ Cleaning the mantle cavity _____ Water currents and gills _____ Function of the… 
Pseudomyona from the Cambrian of North Greenland (Laurentia) and the early evolution of bivalved molluscs
logical studies of present day bivalves that the Ordo­ vician–Recent members of the Class Bivalvia Linnaeus, 1758 form a monophyletic group, although some relation­ ships within the group remain
Patterns of morphologic diversification among the Rostroconchia
The data do not suggest that morphologic evolution became more constrained among rostroconchs as a whole, but instead suggest a reduced characteristic rate of morphologic change in the clade that happened to survive the end-Ordovician extinction.
The origins of molluscs
Aplacophoran morphology therefore does not represent the plesiomorphic condition for molluscs as a whole, and the interrelationships among the conchiferan mollsuscs are still a matter of contention and require further palaeontological and molecular phylogenetic scrutiny.
Monoplacophorans and the Origin and Relationships of Mollusks
  • D. Lindberg
  • Biology, Geology
    Evolution: Education and Outreach
  • 2009
The story of the discovery and study of the Monoplacophora (or Tryblidia) and how they have contributed to our understanding of the evolution of the Mollusca highlights the importance of integrating
Yochelcionella (Mollusca) from the late Middle Cambrian of Bornholm, Denmark
Yochelcionella Runnegar & Pojeta 1974 is a small, cap-shaped mollusc characterised by the development of a tube-like extension of the subapical wall of the calcareous shell. The tube, termed a
Ordovician Orthocerida and Pseudorthocerida (Cephalopoda: Nautiloidea) from the Lower Setul Limestone of the Langkawi Islands, Malaysia
The Lower Setul Limestone in the Langkawi Islands of Peninsular Malaysia is well known for its continuous succession for most of the Ordovician Period. It is part of an extensive carbonate platform
Morphology and paleoecology of the Devonian rostroconch genus Bigalea
The genus Bigalea is a representative of the extinct molluscan class Rostroconchia. Examination of specimens of Bigalea yangi from the Gravel Point Formation of the Middle Devonian Traverse Group of
Taxonomic revision and evolution of Cambrian mollusks of the genus Aldanella Vostokova, 1962 (Gastropoda: Archaeobranchia)
Based on the revised morphology and taxonomy of species and taking into account refined stratigraphic and geographic distribution, the taxonomic position and origin of the genus Aldanella are discussed, and its phylogenetic scenario is reconstructed.
Recent Advances and Unanswered Questions in Deep Molluscan Phylogenetics*
Three recent molecular phylogenetic studies employing different markers and more data have significantly advanced understanding of molluscan phylogeny by providing well-supported topologies and generally congruent results, counter the widely held view that Gastropoda and Cephalopoda are sister taxa.
The shape of the body chamber and of the soft body attachment structures has led to a reconstruction of an ellesmeroceratid soft body that is organized like a primitive conchiferan mollusc, and a tryblidian cephalopod ancestor is supported.