202515.fig.002a
(a)
202515.fig.002b
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202515.fig.002c
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202515.fig.002d
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Figure 2: Histology of the integument of Newfoundland Ophryotrocha sp. (a) Overview of the epidermis and cuticle showing detail of parapodia (note muscular support structure (asterisk) and chaeta (thin arrow)) and orientation of mucus channels. Thick arrows indicate a thin layer of mucus (scale bar = 5 μm). (b) Detail of mucus channel showing secretory cells with basal nuclei and eosinophilic apical cytoplasm (thick arrow). Note thin mucoid secretion on the luminal surface of cells lining channel (thin arrow) (scale bare = 1 μm). (c) Detail of mucus channel from anterior portion of worm. Note the presence of a more viscous mucoid secretion (thick arrows) in this region compared to the previous (Scale bar = 1 μm). (d) Detail of cells lining anterior glandular structure. Note basal nucleus and granular apical cytoplasm (large arrow) with associated viscous secretion (arrowhead) (scale bar = 1 μm).