Bacci, G.; La Greca, M. (1953). Genetic and Morphological Evidence for Subspecific Differences between Naples and Plymouth Populations of Ophryotrocha puerilis. Nature. 171(4364), 1115-1115.
None. Last paragraph: "From a strictly genetic point of view, the 0phryotrocha from Plymouth now studied should be named as a separate species from the Naples 0phryotrocha which is the true puerilis, since Claparede and Mecznikow collected their specimens in the Bay of Naples. However, a number of considerations, which will be discussed elsewhere, induce us to adopt the trinomial nomenclature (0phryotrocha puerilis puerilis Clap. and Mcczn. from the Bay of Naples, and 0. puerilis siberti Mcint. from Whitstable and Plymouth) in order to stress the close relationship between the two populations. A more detailed paper on this subject will be submitted elsewhere."
