Two new arthrodires (placoderm fishes) from the Upper Devonian Gogo Formation, Western Australia

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Abstract

Two new eubrachythoracid arthrodires are described from the Late Devonian (Frasnian) Gogo Formation, Canning Basin, Western Australia. Fallacosteus turneri gen et sp.nov., known from a complete individual, is an advanced camuropiscid with a snout similar to that of Camuropiscis concinnus. It differs in the arrangement of the cheek plates, and in the proportions of the headshield, the median dorsal plate and spinal plate, and has a characteristic suborbital plate indented posteriorly to meet the marginal plate. Fallacosteus is placed phyletically as the sister taxon to Tubonasus, implying that the tubular rostra of Rolfosteus and Tubonansus are convergent features. Pinguosteus thulborni gen. et sp. nov., known from an incomplete trunkshield, is believed to be a coccosteoid having unusually broad, short armour devoid of dermal ornament. Functional morphology of the camuropiscids is discussed. -Author

Original languageEnglish
Pages (from-to)51-63
Number of pages13
JournalMemoirs - Queensland Museum
Volume28
Issue number1
Publication statusPublished - 31 Mar 1990
Externally publishedYes
EventDe Vis Symposium - Queensland Museum, Brisbane, Australia
Duration: 12 May 198714 May 1987

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