@book {582,
	title = {British Planarians},
	year = {1981},
	publisher = {Cambridge University Press},
	organization = {Cambridge University Press},
	address = {Cambridge},
	author = {Ian R. Ball and T. B. Reynoldson}
}
@article {781,
	title = {<i>Dugesia hepta</i>, nuova specie di Planaria di acqua dolce di Sardegna appartenente alla superspecie Dugesia gonocephala (Dug{\`e}s) (Turbellaria, Tricladida)},
	journal = {Bollettino della Societa Sarda Scienze Naturali},
	volume = {20},
	year = {1981},
	pages = {97-107},
	abstract = {<p>A planarian belonging to the group D. gonocephala s.l. was found in 13 sites in Sardinia (11 in the catchment area of the Rio Mannu of Porto Torres and 2 in that of the Coghinas). It is morphologically related to D. benazzii Lepori of Sardinia and Corsica but presents a different karyotype: 2n = 14; n = 7 chromosomes instead of 2n = 16; n = 8 chromosomes. The latter is the most common in the superspecies D. gonocephala of central European and Mediterranean distrubution areas. The planarian in question was considered a distinct species with the group D. gonocephala s.l. and the denomination D. hepta sp. nov. is proposed.</p>
},
	issn = {0392-6710},
	author = {Maria Pala and Salvatore Casu and Rosa Alba Vacca}
}
@article {588,
	title = {The phyletic status of the Paludicola},
	journal = {Hydrobiologia},
	volume = {84},
	number = {1},
	year = {1981},
	pages = {7-12},
	publisher = {Kluwer Academic Publishers},
	abstract = {Is the assumption of the monophyly of the Paludicola (freshwater triclads) justified? There seems little doubt on morphological grounds of the close relationship between the Planariidae and the Dendrocoelidae but it is difficult to connect, phylogenetically, the Dugesiidae with these groups. A connection between the former and some of the latter has been unknowingly implied by the author in previous papers, thus raising an anomaly since this would mean that the Dugesiidae are not monophyletic. Is it possible that the Dugesiidae and the Planariidae + Dendrocoelidae have arisen independently from marine ancestors? The implications of such a speculation are examined.},
	issn = {1573-5117},
	doi = {10.1007/BF00026156},
	url = {http://link.springer.com/article/10.1007\%2FBF00026156},
	author = {Ian R. Ball}
}
