In that same plankton tow we found LOTS and LOTS of bryozoan cyphonautes larvae. We were able to distinguish at least three kinds: the transparent and triangular ones which I think might belong to Membranipora, the oval-shaped non-trasparent ones, which might belong to Electra, and the encrusted triangular ones which might belong to a species of Conopeum (see next post).
Johnson, K. 2002. Phoronida. In: An identification guide to the larval marine invertebrates of the pacific northwest. Edited by Alan Shanks. Oregon State University Press.