20
1
January
159
178
THOMAS, A. T. 1977. Classification and phylogeny of homalonotid trilobites. Palaeontology, 20, 1, 159–178.
A. T. Thomas The composition, classification, and phylogeny of the Homalonotidae are discussed, and new family and subfamily diagnoses given. Plaesiacomia hughesi sp. nov. and P. vacuvertis sp. nov. from the Llanvirn of Wales and Saudi Arabia respectively, and Platycoryphe dyaulax sp. nov. from the Llandovery of Saudi Arabia, are described. The Palaeontological Association (Free Access)