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BULMAN, O. M. B., RICKARDS, R. B. 1968. Some new diplograptids from the Llandovery of Britain and Scandinavia. Palaeontology, 11, 1, 1–15.
O. M. B. Bulman and R. B. Rickards Pseudoclimacograptus hughesi (Nicholson) and P. undulatus (Kurck) are placet in the new subgenus P. (Metaclimacograptus) with the former species as type. The following new subgenera and species are described: Pseudoclimacograptus (Clinoclimacograptus) retroversus subgen. et sp. nov. and Glyptograptus (Pseudoglypto-graptus) vas subgen. et sp. nov. The Palaeontological Association (Free Access)