摘要:

The type species ofPhoidagnostus, P. limbatusWhitehouse, 1936, is redescribed on the basis of further excavation of the holotype which has revealed an associated pygidium. This also demonstrates that the speciesHypagnostus varicosusÖpik, 1961 is a junior subjective synonym ofP. limbatus. Phoidagnostusis closely related toToragnostusandCotalagnostus.

ISSN:0311-5518    

DOI:10.1080/03115519908527807

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor

摘要:

Eastonian trilobite faunas of the Gordon Group in Tasmania include the new speciesCeraurinella oepiki, Erratencrinurus trippi, andPliomerina trisulcata, as well as a reedocalymeninid probably allied toSarrabesiaHammann & Leone, 1997.CeraurinellaandErratencrinurushave not previously been reported from Australia, the former being predominantly Laurentian but also known from NE China, the Himalaya, and Vietnam, and the latter mostly Baltic/Laurentian. Peri-Gondwanan species ofCeraurinellaappear to form a clade, within which Tasmanian and Indian (central Himalayan) taxa are closest relatives.

ISSN:0311-5518    

DOI:10.1080/03115519908527808

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor

摘要:

A reexamination ofMartiniellaGrabau and Tien, 1931 reveals that the type species,M. nasutaGrabau and Tien, is anomen nudum. Martiniellais thus restricted to its type species. A new genus,Chuiellagen. nov., is proposed to host the other Chinese species, previously ascribed toMartiniellaGrabau and Tien, 1931. In addition, a detailed microfacies, taphonomic and palaeoecological analysis of a fossiliferous bed that contains abundant specimens ofChuiellagen. nov. from the Early Carboniferous Kelitag Formation of the Damusi area in the western Kunlun Mountains, Xinjiang Province, northwest China, reveals that species ofChuiellaprobably lived in a clean, warm, shallow-water marine, high energy environment. A review of all described species ofChuiellasuggests this genus is characteristic of the Tournaisian and restricted to the palaeo-equatorial Eastern Tethyan region. Two species ofChuiellaare described, including one new species:Chuiella aitegouensisgen. et sp. nov.

ISSN:0311-5518    

DOI:10.1080/03115519908527809

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor

摘要:

This paper describes a single specimen ofMetalegocerassp. recently discovered from the upper part of the Singa Formation at Batu Asah on the main Langkawi Island off the northwestern coast of Peninsular Malaysia. The discovery represents the first report of a Permian ammonoid from the island and from the Singa Formation and confirms a Sakmarian (Early Permian) age for this part of the formation suggested by brachiopods.

ISSN:0311-5518    

DOI:10.1080/03115519908527810

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor

摘要:

The cosmopolitan, Jurassic to Recent, bivalveAcesta(Limidae) is documented from Australian Cretaceous (upper Albian) rocks in the lowermost section of the Mackunda Formation of Queensland. These specimens from Landsborough Downs, Flinders Shire, represent an endemic new species, herein namedAcesta (Acesta) backaen. sp.Acesta (A.) backaen. sp. was a shallow-water suspension feeder that inhabited the Cretaceous Australian epicontinental sea of the Great Artesian Basin. Although hinge details ofAcesta (A.) backaen. sp. are wanting, this new taxon is most closely allied withAcesta? sp. of the Miria Formation of Western Australia and can clearly be discriminated from other Cretaceous Austral forms.

ISSN:0311-5518    

DOI:10.1080/03115519908527811

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor

摘要:

Skull bones in early lungfish contain permanent insignia of the sensory lines of the head, but osteological evidence of sensory lines in derived lungfish is reduced to foramina for nerves to neuromasts, superficial grooves, or elevated ridges on some bones. This is particularly evident in anterior bones, making definition of these bones difficult, and creating problems for phylogenetic analyses. Despite a close association of the sensory lines with the bones of the developing skull in the Australian lungfish,Neoceratodus forsteri, few traces of the lines remain in the bones of the adult animal. Among derived dipnoans,Mioceratodus, a genus of neoceratodont fossil lungfish from Tertiary deposits in central and northern Australia, is unusual because traces of the supraorbital sensory line are retained in the anterior skull roofing bones of large specimens. Equivalent traces are absent from the rostral bones ofN. forsteri, and from small specimens ofMioceratodus.

ISSN:0311-5518    

DOI:10.1080/03115519908527812

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor

ISSN:0311-5518    

DOI:10.1080/03115519908527813

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor