摘要:

Cones from the Early Cretaceous of southeastern Victoria, and Middle Jurassic of southeastern Queensland are described and illustrated. They are compared withPalissya bartrumifrom the Jurassic of New Zealand and thePalissyatype material,P. sphenolepis, from the Liassic of Sweden and Germany. Cones from Australia and New Zealand share the same basic structure. They are composed of stalked sporophylls arranged helically on a central axis, with paired, cup-shaped processes attached adaxially to the sporophyll blade. These processes surround indentations in the sporophyll surface that are probably the sites where seeds were once attached. Morphological differences, the number of adaxial processes per sporophyll, and geographical and chronological separation, are the basis for describing the Victorian and Queensland specimens as several new species.

ISSN:0311-5518    

DOI:10.1080/03115519508619268

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor

摘要:

The genusChasmazoonis introduced forCellepora abditaMacGillivray (1895) from the Tertiary of Victoria.Chasmazoon abditumhas colonies capable of both an encrusting and free-living mode of growth, and the latter were probably anchored by basal rhizoids. The large, simple orifices and striated, peristomial ovicells ofC. abditumare distinctive, andStichoporina parvicapitataCanu & Bassler (1935), which has closely similar characters, is considered to be synonymous.

ISSN:0311-5518    

DOI:10.1080/03115519508619269

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor

ISSN:0311-5518    

DOI:10.1080/03115519508619270

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor

摘要:

Hadronomaswas a large kangaroo similar in size toSimosthenurus occidentalis. Its pes was relatively long and robust, resembling those of the sthenurinesProcoptodonandSthenurusin possessing ligamentous specialisations of the fourth proximal phalanx, anteroposterior compression of fourth proximal and median phalanges, broad, blunt ‘hoof-like’ terminal fourth phalanx, a shallow calcaneocuboidal ‘step’, anteroposterior as opposed to mediolateral differentiation of the ankle joint, high, rounded profile of the astragalar trochleae and a reduced, medially situated proximal ventromedial facet of the cuboid. The upper and lower limb girdles resemble those of sthenurines in that the coracovertebral angle of the scapula is elevated and produced anteriorly in the form of a rectangular process. The innominate is anteroposteriorly broad and the ischium is flattened in cross section. The tibia possesses a sinuous shaft and an elongated, smoothly convex tibial crest that tapers gradually into the diaphysis.Hadronomas's postcranial skeleton differs from other sthenurines in retaining a large functional fifth digit and in showing no proximodistal compression of the cuboid. A character analysis of the postcranial skeleton ofHadronomasindicates that the genus represents a primitive member of the Sthenurinae, and that the Sthenurinae and the Macropodinae diverged at an early stage in macropodid evolution.

ISSN:0311-5518    

DOI:10.1080/03115519508619271

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor