van Geel et al (1983b): Hook-shaped microfossil, hyaline, greatest diameter 43-117 µm. Apparently of animal origin.
Cook (2009): distinctive hook shape, is hyaline and its greatest diameter ranges from 43–117 μm.
van Geel B, Hallewas DP, Pals JP (1983) A Late Holocene deposit under the Westfriese Zeedijknear Enkhuizen (Prov of Noord-Holland, The Netherlands): palaeoecological and archaeological aspects. Rev. Palaeobot. Palynol. 38:269-335.