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The muscular system of the dwarf ectoparasitic male of Scolelepis laonicola (Tzetlin, 1985) was reconstructed by Falloidin-TRITC technique and confocal scanning microscopy. The anterior part of the male penetrates the female. All four main longitudinal muscle strands of the male’s body enter the female; they are twisted about 90°. Oblique muscle fibers form a pear-shaped structure; they are very similar to the peristomial muscles in Prionospio cirrifera Wiren . The well-developed musculature of the virtually immobile parasitic male of S. laonicola indicates good swimming abilities of juvenile males at the presettlement stage of the free-living larva.

zoosymposia

&lt;p class="HeadingRunIn"&gt;&lt;strong&gt;Anterior muscular system of the dwarf ectoparasitic male &lt;em&gt;Scolelepis laonicola &lt;/em&gt;(Tzetlin, 1985)&lt;em&gt; &lt;/em&gt;(Polychaeta, Spionidae)&lt;/strong&gt;&lt;/p&gt;