Actinocyclus tenuissimus Cleve

Reported by Lobban et al. (2012), still a valid species but in view of discussion in J.S. Park et al. (2022), we reconsidered the specimens. While the size and stria density are in the range of A. tenuissimus, the central area and instinct interfascicular rows are characteristic of A. subtilis (Gregory) Ralfs, to which we now refer all our Guam specimens (see also Lobban & Tharngan in prep.).