Comparative body wall musculature and muscle fibre ultrastructure in branchiobdellidans (Annelida: Clitellata), and their phylogenetic significance |
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Authors: | Roberto Valvassori Magda de Eguileor Giulio Lanzavecchia Stuart R Gelde |
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Institution: | (1) Department of Biology, University' degli Studi di Milano, Via Celoria 26, I - 20133 Milano, Italy;(2) Department of Biology, University of Maine at Presque Isle, 181 Main Street, 04769-2888 Presque Isle, Maine, USA |
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Abstract: | The body wall muscles in five species of branchiobdellidans are all arranged in the oligochaete pattern and the muscle fibres are obliquely striated. The structure of the circular muscle fibres do vary to some degree. The longitudinal muscle fibres in Ankyrodrilus legaeus, Branchiobdella kozarovi, and Xironogiton instabilis all are round circomyarian and thus double-obliquely striated. These species represent three of the four genera composing the family Branchiobdellidae. Although Bdellodrilus illuminatus and Cambarincola fallax, from the families Bdellodrilidae and Cambarincolidae, respectively, also possess a few round circomyarian fibres, most are polyplatymyarian comparable to single-obliquely striated fibres. A similar division of branchiobdellidan families is obtained based on the number of anterior nephridial pores. The muscular structure in the branchiobdellidans shows both similarities and differences with the leeches and the lumbriculid oligochaetes. One phylogenetic explanation for this is that the branchiobdellidans separated from the common clitellate ancestor before the oligochaetes and leeches became recognizable taxa. |
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Keywords: | branchiobdellidans muscles ultrastructure phylogeny |
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