The early Ordovician (Floian) bathyurid trilobite genera 'Jeffersonia, Cullisonia' and 'Bathyurina'

Pioneering work by Christian Poulsen on Early Ordovician Laurentian faunas from Greenland established several genera which have been used often in the literature. Poulsen's original material has not previously been fully revised, and the content and identity of some genera have depended upon in...

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Bibliographic Details
Published inMemoir ... of the Association of Australasian Palaeontologists no. 45; pp. 305 - 347
Main Authors Jonathan M Adrain, Talia S Karim, Stephen R Westrop
Format Journal Article
Published 01.05.2014
Subjects
Collectors and collecting
Morphology (Animals)
Paleontology
Species diversity
Trilobites
Type specimens
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Summary:Pioneering work by Christian Poulsen on Early Ordovician Laurentian faunas from Greenland established several genera which have been used often in the literature. Poulsen's original material has not previously been fully revised, and the content and identity of some genera have depended upon interpretations of his tiny photographs. We revise the type material of the type species of 'Bathyurina' Poulsen and 'Jeffersonia' Poulsen and argue that previous interpretations of their morphology and ideas about potentially related species are not well supported. 'Jeffersonia' has been used for a group of species with distinctive pygidial morphology. New photographs of the lectotype pygidium of the type species, 'J. exterminata' Poulsen, demonstrate that it lacks this morphology. 'Jeffersonia' is restricted to its type species, which is known from a single illustrated pygidium. Other species previously assigned to the genus are transferred to 'Cullisonia' Loch. New photographs of the two known cranidia of 'B. megalops' show that they are not closely similar to those of C. timon (Billings), as has previously been suggested, but rather to those of 'Goniotelina'? 'plicolabeonus' Young, from western Utah, which is revised on the basis of new collections and reassigned to 'Bathyurina'. New species from the Fillmore Formation of western Utah are: 'Bathyurina curtisi' (Carolinites nevadensis Zone), B. sumneri ('Presbynileus ibexensis' Zone), B. hooki (currently unzoned interval above 'P. ibexensis' Zone), 'B. morrisi' ('Psalikilus spinosum' Zone), and 'B.' sp. nov. A ('Psalikilus pikum' Zone).
Bibliography:Memoirs of the Association of Australasian Palaeontologists, No. 45, May 2014: [305]-347
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ISSN:0810-8889