Summary
Scanning- and transmission electron microscopy show that the long, thin notosetae ofNicomache maculata are helical over much of their length, and that their finely feathered appearance is produced by a series of minutely spiny scales. The internal structure varies considerably from one end of the seta to the other. While a helical shape could result from a rotating or asymmetrical secretion-rate gradient across the chaetoblast, we raise the possibility that the spiral represents a warp in the seta following deposition of the setal material.
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Kennedy, B., Kryvi, H. The ultrastructure of the spiral notosetae ofNicomache maculata Arwidsson (Polychaeta, Maldanidae). Experientia 34, 460–462 (1978). https://doi.org/10.1007/BF01935926
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DOI: https://doi.org/10.1007/BF01935926