Oldest Australian vespertilionid (Microchiroptera) from the early Miocene of Riversleigh,Queensland

An upper molar of a small bat, here described from an early Miocene freshwater lime-stone deposit at Riversleigh, northwestern Queensland, is the oldest record in Australia of the microchiropteran family Vespertilionidae. The new taxon is referred to the cosmopolitan genus Leuconoe, but it does not appear to be closely related to the two extant Australian species of this genus.     

Traditional and computed tomographic (CT) techniques link modern and Cenozoic fruits of Pleiogynium (Anacardiaceae) from Australia

Computed tomography (CT) and traditional techniques were used to study the internal morphology of modern fruits of Pleiogynium timoriense (DC.) Leenh., and phosphatized and silicified fruits that were considered to belong to the genus. The results demonstrate that phosphatized fruits from the Oligocene–Miocene Dunsinane site at Riversleigh and silicified fruits from the Oligocene Glencoe Site, which are both in Queensland, are referable to Pleiogynium. The Riversleigh material (Pleiogynium wannanii Rozefelds, Dettmann & Clifford sp. nov.) is very similar to extant P. timoriense (DC.) Leenh. Both possess locules that, in the vertical axial plane, are asymmetrically reniform and enclosed by a two-layered endocarp, the inner layer woody and resistant to decay, the outer of fibres and parenchyma, surrounded by a mesocarp of fibres and sclereids and a parenchymatous exocarp. The outer mesocarp is sculpted by meridionally arranged, elongate depressions (germination apertures) situated at the dorsal surface of each locule; erosion of the mesocarp and outer endocarp provides passage for emergence of the embryo’s radicle on germination. The silicified material from Glencoe (P. parvum Rozefelds, Dettmann & Clifford sp. nov.) is smaller in all its parts and has locules that are ovate in the vertical axial plane. Discrete, cap-like, opercula are not evident in the fruit wall of the fossil and extant fruits studied. The presence of Pleiogynium, and associated taxa, indicates the existence of rainforest communities at Glencoe, and mixed open forest/rainforest at Riversleigh during Oligocene–Miocene times. The multilocular, fossil fruit described as Pleiogynium mitchellii Collinson, Manchester and Wilde from the Eocene deposits at Messel Quarry, Germany, is not considered to belong in the genus, as evidence of elongate depressions on the dorsal surface of the fruit stones has not been demonstrated conclusively, and its internal morphology/anatomy differs significantly from that of Pleiogynium.     

A new ‘bone-cracking’ dasyurid (marsupialia), from the Miocene of Riversleigh,northwestern Queensland

Ganbulanyi djadjinguli gen. et sp. nov. is described on the basis of an upper molar and premolar from an early-late Miocene site in Riversleigh, northwestern Queensland. The paucity of material constrains certainty in the determination of it's phylogenetic position. But, among dasyuromorphians, and dependent on the interpretation of tooth homology, this species shows unequivocal synapomorphies only with the derived dasyurine Sarcophilus, and/or Barinya wangala, a possible sister taxon to the modern dasyurid radiation (i.e., Sminthopsinae, Phascogalinae, Dasyurinae). Other apomorphies, evident in G. djadjinguli, are common to both carnivorous thylacinids and dasyurids within the order. Some dental features of Ganbulanyi djadjinguli are treated as adaptations to a ‘bone cracking’ habitus. If this interpretation is correct, then this species represents the only pre-Pliocene Australian taxon known to occupy such a niche and perhaps the smallest specialist ‘bone-cracker’ within Mammalia.     

A new Miocene carnivorous marsupial,Barinya kutjamarpensis (Dasyuromorphia), from central Australia

Binfield, P., Archer, M., Hand, S.J., Black, K.H., Myers, T.J., Gillespie, A.K. & Arena, D.A., June 2016. A new Miocene carnivorous marsupial, Barinya kutjamarpensis (Dasyuromorphia), from central Australia. Alcheringa 41, xx–xx. ISSN 0311-5518.

A new dasyuromorphian, Barinya kutjamarpensis sp. nov., is described on the basis of a partial dentary recovered from the Miocene Wipajiri Formation of northern South Australia. Although about the same size as the only other species of this genus, B. wangala from the Miocene faunal assemblages of the Riversleigh World Heritage Area, northwestern Queensland, it has significant differences in morphology including a very reduced talonid on M₄ and proportionately wider molars. Based on the structural differences and the more extensive wear on its teeth, the central Australian species might have consumed harder or more abrasive prey in a more silt-rich environment than its congener, which hunted in the wet early to middle Miocene forests of Riversleigh.

Pippa Binfield [pippa.binfield@outlook.com], Michael Archer [m.archer@unsw.edu.au], Suzanne J. Hand [s.hand@unsw.edu.au], Karen H. Black [k.black@unsw.edu.au], Troy J. Myers [t.myers@unsw.edu.au] Anna K. Gillespie [a.gillespie@unsw.edu.au] and Derrick A. Arena [rick@sitc.net.au], PANGEA Research Centre, School of Biological, Earth and Environmental Sciences, University of New South Wales 2052, Sydney, Australia.     

A second species of the possum Durudawiri (Marsupialia: Miralinidae) from the early Miocene of Riversleigh,northwestern Queensland

Durudawiri anfractus sp. nov. (Marsupialia: Miralinidae) is described from Riversleigh. This, the second described species of the genus, is very similar in morphology to, but much larger than, D. inusitatus. Durudawiri anfractus and D. inusitatus are found at similar sites, all early Miocene. The Miralinidae remains one of the most time-restricted families of marsupial, being found so far in only the late Oligocene and early Miocene.     

Ngapakaldia bonythoni (Marsupialia,Diprotodontidae): new material from Riversleigh,northwestern Queensland,and a reassessment of the genus Bematherium

A latest Permian (late Changhsingian) radiolarian fauna is recorded from the upper Talung Formation, Hushan, Nanjing, Jiangsu Province, South China. This fauna includes 24 species belonging to 16 genera; new species are Albaillella hushanensis, Copicyntroides stellatus and Trilonche crassus. The presence of the radiolarian fauna and its taxonomic composition reveal that the Eastern Qinling-Dabie deep sea, which was located along the northern margin of the northeastern Yangtze Basin, persisted at least until the end of the Palaeozoic and that the collision between the North China and South China plates had not occurred by the end of the Permian.     

Maradidae: a new family of vombatomorphian marsupial from the late Oligocene of Riversleigh,northwestern Queensland

Black, K., March 2007. Maradidae: a new family of vombatomorphian marsupial from the late Oligocene of Riversleigh, northwestern Queensland. Alcheringa 31, 17-32. ISSN 0311-5518.

Marada arcanum gen. et sp. nov. is described from the late Oligocene Hiatus Site, Riversleigh World Heritage Property, northwestern Queensland. Although known from only a single dentary, it is assigned to a new family Maradidae, based on a unique combination of both plesiomorphic and apomorphic features. Of the known vombatomorphians, Marada is most similar to primitive wynyardiids and diprotodontoids (palorchestids and diprotodontids). Further clarification of the phylogenetic position of Maradidae within Vombatomorphia requires discovery of upper dentitions and crania.

Karen Black [k.black@unsw.edu.au], Vertebrate Palaeontology Laboratory, School of Biological, Earth and Environmental Sciences, University of New South Wales, Sydney, 2052, Australia; received 17.1.2005, revised 1.6.2005.     

New specimens of the logrunner Orthonyx kaldowinyeri (Passeriformes: Orthonychidae) from the Oligo-Miocene of Australia

Nguyen, J.M.T., Boles, W.E., Worthy, T.H., Hand, S.J. & Archer, M., 2014. New specimens of the logrunner Orthonyx kaldowinyeri (Passeriformes: Orthonychidae) from the Oligo-Miocene of Australia. Alcheringa 38, 000–000. ISSN 0311–5518.

Logrunners (Orthonychidae) are a family of ground-dwelling passerines that are endemic to the Australo-Papuan region. These peculiar birds are part of an ancient Australo-Papuan radiation that diverged basally in the oscine tree. Here we describe eight fossil tarsometatarsi of the logrunner Orthonyx kaldowinyeri, and a distal tibiotarsus tentatively assigned to this species from sites in the Riversleigh World Heritage Area, Australia. The new fossil material ranges in age from late Oligocene to early late Miocene, and extends the temporal range of the Orthonychidae into the late Oligocene; this is the geologically oldest record of the family. These specimens also include the oldest Cenozoic passerine fossils from Australia that can be confidently referred to an extant family. The distinctive features of the tarsometatarsus and tibiotarsus of extant logrunners, which are probably related to their unusual method of foraging, are also present in O. kaldowinyeri. Assuming that O. kaldowinyeri had vegetation requirements similar to those of extant logrunners, its presence in various Riversleigh sites provides clues about the palaeoenvironment of these sites.

Jacqueline M.T. Nguyen [jacqueline.nguyen@unsw.edu.au] (author for correspondence), Suzanne J. Hand [s.hand@unsw.edu.au], Michael Archer [m.archer@unsw.edu.au], School of Biological, Earth and Environmental Sciences, University of New South Wales, Sydney, NSW 2052, Australia; Walter E. Boles [walter.boles@austmus.gov.au], Ornithology Section, Australian Museum, 6 College Street, Sydney, NSW 2010, Australia; Trevor H. Worthy [trevor.worthy@flinders.edu.au], School of Biological Sciences, Flinders University, Adelaide, SA 5001, Australia. Received 19.9.2013; revised 11.10.2013; accepted 25.10.2013

http://zoobank.org/urn:lsid:zoobank.org:pub:F4F6219A-22A3-4F6B-8AEE-2957A227C0E0     

Development of the graptoloid rhabdosome

Proximal development of the dichograptoid rhabdosome is re-examined in detail. Two major types are recognised: the artus type (= dichograptid type of Bulman) in which th 1¹ is dicalycal, and the isograptid type (= isograptid + leptograptid types of Bulman) in which theca 1² is dicalycal. In branching dichograptids, distal stipe division takes place by replication of the thecal budding sequence employed in the initial dichotomy of the rhabdosome and is always of isograptid type. Dichotomies beyond the first are unknown in species with initial development of other than isograptid type. The thecal budding pattern and stipe composition of dendroids can be interpreted in terms of the structure of, and thecal notation used for, graptoloids and it is thus possible to compare directly the mode of stipe division in the two groups. It is found that both distal and proximal dichotomy in dendroids are achieved by a pattern of thecal budding closely comparable with that of the isograptid type of division in graptoloids. The isograptid development type is therefore thought to have been directly derived from dendroids, and is the primitive type for Graptoloidea. The artus type was derived via three or more independent lineages, at least one of which (that leading to the artus group of pendent didymograptids) involved an ancestor with isograptid development. Proximal end characters of Phyllograptus suggest that this genus and biserial graptolites of the family Diplograptidae shared a common ancestor.