A new elasmosaurid specimen from the upper Maastrichtian of Antarctica: new evidence of a monophyletic group of Weddellian elasmosaurids

O’Gorman, J.P. & Coria, R.A. September 2016. A new elasmosaurid specimen from the upper Maastrichtian of Antarctica: new evidence of a monophyletic group of Weddellian elasmosaurids. Alcheringa 41, xxx–xxx. ISSN 0311-5518

A new fossil elasmosaurid specimen, MLP 15-I-7-48, from the upper Maastrichtian Sandwich Bluff Member of the López de Bertodano Formation, Vega Island, Archipelago James Ross, Antarctica, is described. The fossil is a well-preserved anterior limb, which shares with Vegasaurus molyi from the upper Maastrichtian of Antarctica, a concave to flat anterior margin of the humeral shaft, and with Vegasaurus molyi and Aphrosaurus furlongi from the upper Maastrichtian of California, a well-defined depression on the anterior margin of the ventral surface of the humeral shaft. A phylogenetic analysis recovered MLP 15-I-7–48 as sister group of the lower Maastrichtian Vegasaurus molyi within a new clade nominated as Weddellonectia: Kawanectes lafquenianum ((Vegasaurus molyi; MLP 15-I-7–48) (Morenosaurus stocki (Aristonectinae))). This indicates that the previously proposed faunal turnover between the early and late Maastrichtian Weddellian marine reptile fauna, did not severely affect the non-aristonectine elasmosaurids. Additionally, other taxa previously considered evidence of a faunal turnover are re-evaluated.

José P. O’Gorman. [joseogorman@fcnym.unlp.edu.ar]. División Paleontología Vertebrados, Museo de La Plata, Universidad Nacional de La Plata, Paseo del Bosque s/n., B1900FWA, La Plata, Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas, Argentina. Rodolfo A. Coria. [rcoria@unrn.edu.ar]. Instituto de Investigación en Paleobiología y Geología, Universidad Nacional de Río Negro—Subsecretaría de Cultura de Neuquén—Museo Carmen Funes, Av. CVórdoba 55 (8318), Plaza Huincul, Neuquén, Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas, Argentina.     

Reassessment of Neovenericor Rossi de García,Levy & Franchi, 1980 (Bivalvia: Carditidae) using a geometric morphometric approach,and revision of planicostate carditids from Argentina

Pérez, D.E., Alvarez, M.J. & Santelli, M.B., July 2016. Reassessment of Neovenericor Rossi de García, Levy & Franchi, 1980 (Bivalvia: Carditidae) using a geometric morphometric approach, and revision of planicostate carditids from Argentina. Alcheringa 41, xxx–xxx. ISSN0311-5518.

Various systematic approaches have been applied to the Neogene planicostate carditids of Patagonia. Some authors have included these species within Venericor (known from the Eocene of North America and Europe) or in Megacardita (recorded from the Miocene of Europe). By contrast, Rossi de García et al. erected the endemic Neovenericor in 1980 for Patagonian species. The three proposed genera have variable outlines and similar hinge teeth configuration. Two geometric morphometric analyses were performed, which included the type species of the following taxa: M. jouanneti (middle Miocene, Mediterranean Basin), V. planicosta (middle Eocene, Paris Basin) and N. austroplata (early Miocene, Chenque Formation, Chubut Province). In the first approach, an Elliptic Fourier Analysis was used to test the general variability of outlines. In the second, a landmark-based method was employed to analyse the hinge configuration, followed by a Discriminant Function Analysis. The outline analysis discriminated Megacardita from the other two taxa based on its more elongate and rectangular shells. The Landmark Analysis distinguished the three taxa based on both, left and right hinges. The Discriminant Function Analysis showed significant values for this differentiation. Neovenericor has a higher hinge plate, broader and less posteriorly inclined teeth, and a less sinuous ventral edge than Megacardita; and it has larger and more posteriorly inclined teeth than Venericor. Other morphological characters of the genus include an intermediate number of radial ribs that do not dissipate ventrally, and wide and deep intercostal spaces. Thus, Neovenericor is clearly a distinct taxon. All Argentinian planicostate carditids were revised and included in this genus because they embrace its diagnostic features.

Damián E. Pérez [trophon@gmail.com], Maximiliano J. Alvarez [maxialvarez82@gmail.com] and M. Belén Santelli [mbsantelli@gmail.com], Museo Argentino de Ciencias Naturales Bernardino Rivadavia, División Paleoinvertebrados, Av. Ángel Gallardo 470 (C1405DJR), Buenos Aires, Argentina.     

A continuing agenda for gender: the role of the IGU Commission on gender and geography

In examining the development of the International Geographical Union’s (IGU) Commission on Gender and Geography over the last three decades, we first highlight the advances made to establish visibility for gender studies within the IGU and create structures for more inclusive feminist geographies across national, disciplinary and other borders. Given that many of the early and most widely-known advances were largely within Anglophone contexts, we then discuss the ongoing challenges and possibilities for advancement faced by feminist geographers who teach, research, and write on gender in other locations. While some of these challenges (such as a continued lack of recognition for gender studies, paternalistic hierarchies, and specific government regimes) are country-specific, others are related to broader issues of neoliberalism and corporatization, and inequities in academic publishing. Clearly, continued efforts are needed to strengthen the agenda for gender to promote more inclusive histories, practices and processes of gender/feminist geography in research, teaching and application in the international arena.     

Regional Polycentrism in a Mountainous Territory: The Case of Covilhã (Portugal) and Alpine Cities

The Portuguese mountain city of Covilhã possesses a singular industrial tradition. Today, many of the urban interventions undertaken result in an urban space and landscape disconnected from the mountains. Alpine mountain cities emerge as emblematic, given the representativeness the Alps assume within the context of European mountains. In the Alpine region, the polycentric system of cities condenses the characteristics associated with the topographical particularities and singular types of inter-municipal and cross-border relationships, where the economic changes and regional policies can be observed with greater clarity due to their specificity. In general terms, the quality of life, based on the landscape values, the identification of the citizens with their territory, and on the territorial planning at different scales, emerges as being linked to the construction of a brand identity based on sustainable urban development. It is in this sphere that the study of Alpine cases can inspire good practices to be applied in the Portuguese territory of the Beira Interior, namely in the medium-sized cities and in the synergies between them and the natural spaces. Thus Covilhã finds itself in an advantageous position to use its situation to construct a city brand in harmony with the mountain territory.     

Experimental explorations into the aceramic dry distillation of <Emphasis Type="Italic">Betula pubescens</Emphasis> (downy birch) bark tar

A range of experiments were conducted in an attempt to create tar from the bark of Betula pubescens (downy birch) using an aceramic dry distillation process. Fire structures based on small pits and small kiln-like mounds were explored with a focus on fire intensities and differing burn times under field-based conditions. Heat penetration presented itself as an all-important factor, and the depth of the construction of the structures and features was considered to directly correlate to the impact of the heat. Single variable experiments confirmed that the necessary reducing atmosphere was achievable despite friable soil, but that heat would not penetrate a 50- to 80-mm-deep layer of grass turf. The evolution of structures from pits towards a raised type resulted in kiln-like structures which proved more successful. Though the experiments did not successfully produce tar as a finished product, they did lead to a better understanding of the dry distillation process of the established technology of birch bark tar extraction in aceramic societies.     

Spectrochemical Characterization of Red Pigments Used in Classic Period Maya Funerary Practices

We studied the composition, colour chromaticity and form of application of red pigments in human bone samples from seven Classic period Lowland Maya sites. The samples were analysed by X‐ray diffraction, scanning electron microscopy (SEM) and X‐ray energy‐dispersive spectroscopy (EDS). Colour was measured using conventional colour identification standards (Munsell) and reflectance spectroscopy. Cinnabar and hematite were identified as the pigments used. We conclude that the reflectance method has advantages over conventional visual results, as it provides precise, objective and quantifiable optical data to distinguish the chromaticity, colour saturation and brightness of the pigments.     

Early Renaissance Production Recipes for Naples Yellow Pigment: A Mineralogical and Lead Isotope Study of Italian Majolica from Montelupo (Florence)

The Naples Yellow pigment was apparently used for the first time by the Egyptians, as a glass‐colouring agent. Also known in the Mesopotamian and Roman cultures, the recipe was lost in Western Europe between the fourth and the 16th centuries ad . The recipe for the production of lead antimonate recently discovered in the ‘Codice Calabranci’ (second half of the 15th century) at Montelupo, a small town near Florence (Italy) known for its large‐scale ceramic production, possibly represents the very first evidence of the reintroduction of Naples Yellow in Western Europe after a long period of absence. The major‐element composition of the lead antimonate pigment in the Montelupo ceramics of the 15th and 16th centuries is in accordance with the ‘Codice Calabranci’ recipes. Lead isotope analyses indicate that the lead used to produce the yellow pigments and the underlying glaze of the Montelupo majolica did not come from the Tuscan mining districts, but was possibly imported via Venice from more distant lead sources in Turkey.