摘要:

Sporangia andin situspores of Cretaceous-Tertiary fertile macrofossils allocated toAnemia, Pelletixia, Ruffordia, Mohriopsis, Schizaeopsis, Schizaeangium, andSchizaeopterisare compared with sporangial and spore types in extantAnemiaandMohria(Schizaeaceae), andCeratopteris(Pteridaceae). Trilete, cicatricose to canaliculate spores characteristic of extantAnemiaare identified in fossilAnemia colwellensisChandler,Anemia fremontiiKnowlton formafertilisAndrews,Pelletixia valdensis(Seward) Watson & Hill,Pelletixia amelguitaSkog, and Russian specimens ofRuffordia goeppertii(Dunker) Seward; smooth-walled spores occur inAnemia poolensisChandler. EnglishRuffordia goeppertiihave spores that are morphologically intermediate between those of extantAnemiaandCeratopteris, but sporangial features confirm alliance with the Schizaeaceae. Sporangia are unknown from fossilSchizaeopsis americanaBerry, and its spores are distinct from those of extant ferns. Distally annulate sporangia consistent with those of the Schizaeaceae occur in fossilSchizaeangium jurassicumBohra & Sharma,Schizaeopteris mesozoicaStopes & Fuji andMohriopsis plasticaAppert, but spore morphology of these taxa awaits clarification and/or documentation.

ISSN:0311-5518    

DOI:10.1080/03115519208619111

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

摘要:

The pendent graptoloidDidymograptus bidensKeble is revived and assigned to the new genusKeblograptusand included in the family Sinograptidae, subfamily Sigmagraptina. This species has a short range in the Lower Ordovician (upper Chewtonian — lower Castlemainian) and may prove to be of significant biostratigraphic value.

ISSN:0311-5518    

DOI:10.1080/03115519208619112

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

摘要:

The remains of two species (a macropodid and a diprotodontid) of large, extinct marsupials have been recovered from cave and fluvial deposits in Irian Jaya. The sites are located at 2,800–2,950 m elevation in what is today upper montane forests, although at the time of deposition (41,500 ± 1,500 ybp for the fluvial sediments) the area was covered with subalpine herbfield. The diprotodontid is described here asMaokopia ronaldigen. et sp. nov., while the macropodid is described asProtemnodon hopeisp. nov. It is likely that these were the only really large marsupial species that inhabited the region.

ISSN:0311-5518    

DOI:10.1080/03115519208619113

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

ISSN:0311-5518    

DOI:10.1080/03115519208619114

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

摘要:

Phosphorites from the Middle Cambrian Monastery Creek Phosphorite Member, Queensland, Australia, yielded a group of soft-bodied, microscopic fossils of yet unknown affinity. They are three-dimensionally preserved and composed of two structurally different units. In particular one of the described genera has an upper surface pattern that is strikingly similar to the Late PrecambrianDickinsonia; even the quilted pneu structure observed on Vendozoa might be present on the Middle Cambrian material. Alternatively, a possible relationship to sclerites that also consist of two structurally different units is discussed. Three new species of three new genera are described.

ISSN:0311-5518    

DOI:10.1080/03115519208619115

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor