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

J. A. Long

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

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10 Citations (Scopus)

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 language	English
Pages (from-to)	51-63
Number of pages	13
Journal	Memoirs - Queensland Museum
Volume	28
Issue number	1
Publication status	Published - 31 Mar 1990
Externally published	Yes
Event	De Vis Symposium - Queensland Museum, Brisbane, Australia Duration: 12 May 1987 → 14 May 1987

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

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",

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AB - 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

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