Protolaeospira ambilateralis

Glasby, Christopher J.; Read, Geoffrey B.; Lee, Kenneth E.; Blakemore, R.J.; Fraser, P.M.; Pinder, A.M.; Erséus, C.; Moser, W.E.; Burreson, E.M.; Govedich, F.R.; Davies, R.W.; Dawson, E.W. (2009). Phylum Annelida: bristleworms, earthworms, leeches. <em>[Book chapter].</em> Chapt 17, pp. 312-358. in: Gordon, D.P. (Ed.) (2009). New Zealand inventory of biodiversity: 1. Kingdom Animalia: Radiata, Lophotrochozoa, Deuterostomia. Canterbury University Press, Christchurch.

Pixell, Helen L. M. (1912). Polychaeta from the Pacific coast of North America. Part I. Serpulidae, with a revised table of classification of the genus Spirorbis. <em>Proceedings of the Zoological Society of London.</em> [1912 part 3-4]: 784-805, plates 87-89 [follow p.784].