monaxon

plural monaxons

1. A monaxonal spicule of a sponge.

   A desma consists of an ordinary minute monaxon, triradiate or tetraxon spicule called crepis, on which layers of silica have been deposited irregularly.

   2017, Zoology for Degree Students (For B.Sc. Hons. 1st Semester, As per CBCS), →ISBN, page 185

   2 more examples

   The monaxons are all of large size, being at least twice as thick as the basal rays of the triradiate systems, and not less than 300 μ in length, allowing for those which are apparently not full-grown.

   1905, Zoological Society of London, Proceedings of the General Meetings for Scientific Business of the Zoological Society of London, page 10

   In this sponge the ordinary monaxons vary greatly in size but agree in their characters, and form one class in which every gradation can be found between the two extremes of size. […] Again, his fig. 25, intended to represent a large monaxon with many cells on it, is not convincing to me, as it is not possible with the magnification given (300) to determine the relation of the cells to the spicule.

   1908, Quarterly Journal of Microscopical Science, pages 312, 313