Myo-anatomy of juvenile and adult loxosomatid Entoprocta and the use of muscular body plans for phylogenetic inferences

Journal of Morphology
A Wanninger

Abstract

The anatomy of the muscle bauplan in juvenile buds and adult specimens of the solitary loxosomatid entoprocts Loxosoma nielseni and L. annelidicola was studied by means of fluorescence staining of F-actin and confocal laser scanning microscopy. Although the general myo-anatomy of the body wall shows numerous similarities, both species express significant variations in the arrangement of their pedal muscles. In addition, L. annelidicola alone shows a distinct pair of rectum retractor muscles. Circular muscles are absent in the entire body wall of both species, as well as in previously investigated colonial taxa, which is therefore regarded as basal for Entoprocta. This is in striking contrast to the conditions found in other spiralian or lophotrochozoan taxa. The simple morphology of entoproct tentacle muscles, however, coincides with the phoronid-ectoproct condition and may be due to functional constraints of a simple filter-feeding system. This work shows that variations in the muscular anatomy provide useful characters for systematic analyses on species as well as phylum level and thus allow significant insight regarding metazoan body plan evolution. The phenomenon of phenotypic plasticity and its consequences for phylogeneti...Continue Reading

References

May 1, 1996·Journal of Molecular Evolution·L Y MackeyJ R Garey
Mar 18, 1999·Development Genes and Evolution·A WanningerG Haszprunar
Nov 1, 2001·The Biological Bulletin·S D Hill, B C Boyer
Apr 27, 2002·Nature·Patricia BeldadePaul M Brakefield
Sep 10, 2002·Journal of Morphology·Andreas Wanninger, Gerhard Haszprunar

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Citations

Mar 9, 2010·Frontiers in Zoology·Alen Kristof, Annette Klussmann-Kolb
Mar 9, 2010·Frontiers in Zoology·Thomas SchwahaAndreas Wanninger
Jan 5, 2010·Molecular Phylogenetics and Evolution·Bernhard HausdorfIris Bruchhaus
Mar 11, 2009·Journal of Morphology·Kenneth Agerlin HalbergReinhardt Møbjerg Kristensen

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