2 literature references for Pontodrilus litoralis (Grube, 1855):

Author: Erséus, C.; Healy, B.M.
Year: 2001
Title: Oligochaeta, in: Costello, M.J. et al. (Ed.) (2001). European register of marine species: a check-list of the marine species in Europe and a bibliography of guides to their identification. Collection Patrimoines Naturels, 50:
Author: Erseus, C.
Year: 2009
Title: Oligochaeta. In: Gordon, D. (Ed.) (2009). New Zealand Inventory of Biodiversity. Volume One: Kingdom Animalia. 584 pp