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Unusual Model of Lumbriculids' Helical Muscles: Comparison with Body Wall Muscles in Other Microdriles by Magda de Eguileor; Giulio Lanzavecchia; Roberto Valvassori; Plinio Lanvecchia is a Environmental Science article available to read on EtoBox.

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Longitudinal body wall muscles of lumbriculids are characterized by unique peculiarities; they are ribbonshaped, with regularly distributed Z-elements and sarcotubules crossing the fibres from one side to another. These act as a sequence of pivots for mechanical and functional control during contraction. Myosin filaments are equally ribbon-shaped, and in the XZ plane they appear sigmoid. All these characteristics can be deduced from a comparison between theoretical computerized images and corresponding electron micrographs. The muscles of lumbriculids are only apparently similar to those of enchytraeids and tubificids, and are completely different from the muscles of haplotaxids and branchiobdellids. A comparison between body wall muscles of these microdriles suggests the opportunity of using the muscle organization and ultrastructure as a taxonomic character.

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Author

Magda de Eguileor; Giulio Lanzavecchia; Roberto Valvassori; Plinio Lanvecchia

Publisher

Springer; Springer-Verlag; Springer (Kluwer Academic Publishers); Kluwer Academic Publishers; Springer Science and Business Media LLC (ISSN 1573-5141)

Published

1987

Language

EN

Field

Environmental Science (Physical Sciences)