A primitive eubrachythoracid arthrodire from Gogo, Western Australia

A new eubrachythoracid arthrodire, Hanytoombsia elegans gen. et sp. nov., is described from the Upper Devonian Gogo formation of Western Australia. Its structure and relationships are discussed within the framework provided by a new sketch cladogram for arthrodires. H. elegans is morphologically similar to Coccosteus cuspidatus , but its relationships among primitive eubrachythoracids are unknown.     

The ontogeny of supraneurals and neural arches in the cypriniform Weberian Apparatus (Teleostei: Ostariophysi)

A study of nine cyprinid and six catostomid species focused on the early ontogeny of supraneurals and neural arches of the Wehcrian apparatus. These elements chondrify during the mesolarval stage, and there is strong temporal correlation with chondrification of the dorsal-fin pterygiophores. Supraneurals 2 and 3 form from separate chondrification centers that subsequently coalesce. In some cyprinids and catostomids, Sn 2 is at first bilaterally paired. This observation demonstrates that supraneurals are not always unpaired, and provides circumstantial evidence that the paired claustra are homologous to Sn l. Claustra in 14 of 15 species examined possessed at least a cartilage rudiment. No evidence was found to support the currently prevalent hypothesis that the claustra form from dissociated parts of the first neural arch.     

A second eubrachythoracid arthrodire from Gogo, Western Australia

A new genus of long-snouted, eubrachythoracid arthrodire, Camuropiscis gen. nov., is described from the Upper Devonian Gogo formation of Western Australia. It is represented by two species, the type C. concinnus sp. nov. and C. laidlawi sp. nov. These species are interchangeable with Coccosteus spp. in a sketch cladograin for arthrodires; their phylogenetic relationships are not known in any detail. C. concinnus has a well-preserved pelvic girdle and throws new light on the structure of this element in arthrodires.     

Corrigendum: Renaming of Kimberia Dennis-Bryan & Miles, 1983

Mr Neville Pledge, Curator of Fossils at the South Australian Museum, has informed us that the name Kimberia which we used to describe a new genus of arthrodire from Gogo (Dennis-Bryan & Miles, 1983) is preoccupied by a gastropod. This was described by Cotton & Woods (1935) as a subgenus of Turritella Lamarck, the type species being Turritella (Kimberia) kimberi. We therefore propose to substitute the name Kimberleyichthys gen. nov. for the arthrodire.