Thomas H. Rich, Timothy F. Flannery, Alistair R. Evans, Matt White, Timothy Ziegler, Alanna Maguire, Stephen Poropat, Peter Trusler & Patricia Vickers-Rich (2020)
Multiple hypotheses about two mammalian upper dentitions from the Early Cretaceous of Australia.
Alcheringa: An Australasian Journal of Palaeontology (advance online publication)
doi: https://doi.org/10.1080/03115518.2020.1829042
https://www.tandfonline.com/doi/full/10.1080/03115518.2020.1829042
Ben Creisler
Recent papers not yet mentioned:
Thomas H. Rich, Timothy F. Flannery, Alistair R. Evans, Matt White, Timothy Ziegler, Alanna Maguire, Stephen Poropat, Peter Trusler & Patricia Vickers-Rich (2020)
Multiple hypotheses about two mammalian upper dentitions from the Early Cretaceous of Australia.
Alcheringa: An Australasian Journal of Palaeontology (advance online publication)
doi: https://doi.org/10.1080/03115518.2020.1829042
https://www.tandfonline.com/doi/full/10.1080/03115518.2020.1829042
Two enigmatic, poorly preserved specimens of mammalian upper molars have been recovered from the Eric the Red West locality in Victoria, Australia. They are two of the three known specimens of mammalian upper molars from the Mesozoic of Australia. The two are quite different from one another. One is likely to be a tribosphenic mammal, the other may have a distant relationship to the monotreme or haramyid Kollikodon.=====
Free pdf:Michael BUCHWITZ, Lorenzo MARCHETTI, Maren JANSEN, Daniel FALK, Frank TROSTHEIDE & Joerg W. SCHNEIDER (2020)
Ichnotaxonomy and trackmaker assignment of tetrapod tracks and swimming traces from the Middle Permian Hornburg Formation of Saxony-Anhalt (Germany).
Annales Societatis Geologorum Poloniae 90: (advance online publication)
doi: https://doi.org/10.14241/asgp.2020.23
http://www.asgp.pl/sites/default/files/in_press_90_Buchwitz_et_al.pdf
Here we describe new material of tetrapod tracks and swimming traces from the Konberg quarry, a tracksite of the late middle Permian Hornburg Formation in Saxony-Anhalt, central Germany. A relatively well-preserved trackway and several isolated imprints are assigned to Capitosauroides isp. Among others, toe proportions in the manus and pes footprints of the newly described specimens and the long, proximal and detached pedal digit V imprint are similar to the type ichnospecies Capitosauroides bernburgensis from the Early Triassic of Bernburg, Saxony-Anhalt. In these features the new Konberg material differs from other ichnotaxa, such as Amphisauropus and Varanopus, which may look similar in their relative length of the sole, digit proportions and/or and in the digit tip imprint morphology. The comparatively large manus imprint, which is wider than long, the relative length and shape of the sole impression, the digit proportions that are indicative for more ectaxonic manus and more mesaxonic pes, the low pace angulation and the low imprint-size-normalized stride length in the Konberg track type are distinct from C. bernburgensis. It shares, however, a certain similarity with recently described material of Capitosauroides from middleâlate Permian tracksites. These observations are in agreement with the results of a multivariate analysis including Capitosauroides and morphologically similar ichnotaxa. Our findings would justify the erection of a new ichnospecies if more trackways with a similar or slightly better preservation were at hand. Hornburg Formation material previously assigned to Amphisauropus is herein considered as indetermined tetrapod tracks, whereas the occurrence of Dromopus isp. is confirmed. This reassignment shortens the stratigraphic range of the ichnogenus Amphisauropus, which appears to be restricted to the early Permian, since younger occurrences are questionable. In agreement with the attribution of Capitosauroides to eutheriodont producers, we regard the Konberg material assigned to this ichnogenus as tracks of small and possibly semi-aquatic therapsids. Abundant tetrapod swimming traces that occur together with Capitosauroides isp. on the same bedding planes are interpreted as having been made by the same group of producers. The subaquatic traces often consist of short parallel claw mark sets. In agreement with a derived amniote producer group, they indicate propulsion by parasagittal limb movement rather than axial undulation.ÂÂ