Natural history museums house numerous previously undescribed species and unknown information hidden in their collections. We describe lower Carboniferous slit-bearing gastropods (order Pleurotomariida, subclass Vetigastropoda; and family Goniasmatidae, subclass Caenogastropoda) from previously unreported gastropod collections made by Jane Longstaff (Jane Donald), one of the pioneering paleontologists of Paleozoic gastropods in the late nineteenth and early twentieth centuries. The gastropods were collected from the Lower Limestone Formation (Visean, Brigantian) near Dalry, Ayrshire, Scotland. The collection consists largely of microgastropods, many of which are unusually well-preserved including delicate ornament and protoconchs (larval shells). Three new pleurotomariidan species are described—Biarmeaspira heidelbergerae new species, Neilsonia seussae new species, Tapinotomaria longstaffae new species—in addition to seven species belonging to Borestus Thomas, 1940, Stegocoelia (Stegocoelia) Donald, 1889, Stegocoelia (Hypergonia) Donald, 1892, Donaldospira Batten, 1966, and Platyzona Knight, 1945. The caenogastropod-type protoconch is documented for the first time in Hypergonia, which is therefore placed in Goniasmatidae. The new data confirm that Neilsonia Thomas, 1940 (type genus of Neilsoniinae) belongs to Pleurotomariida and is distinct from the morphologically convergent Peruvispira Chronic, 1949 (Goniasmatidae). The selenizone morphology is identical in Biarmeaspira Mazaev, 2006 and Baylea de Koninck, 1883 during their early ontogeny, and Biarmeaspira develops an angulation on the selenizone (the diagnostic feature) in late ontogeny. This corroborates earlier suggestions that Biarmeaspira evolved from Baylea. Biarmeaspira heidelbergerae n. sp. is the first Carboniferous record of Biarmeaspira, which was previously only known from the Permian. The angulated selenizone evidently evolved several times in Pleurotomariida and the repeated appearance of this character in different groups (e.g., Phymatopleuridae, Eotomariidae, Pleurotomariidae) needs further studies using phylogenetic methods.

UUID: http://zoobank.org/92ae9a99-5774-4ee9-bf5d-9a9319494ef6

While gender history has developed into a powerful branch of premodern history, we still know little about gender relations around Maximilian I. One reason is that research concentrated for a long time on the individual personality of the emperor without paying much attention to the manifold relations among men and women that in fact contributed to establishing his rule. Another reason is the specific constellations of Maximilian's relationships with his wives Mary of Burgundy and Bianca Maria Sforza, with his daughter Margaret of Austria and grand-daughter Mary of Hungary, which have been mostly discussed in the framework of their personal courts and regional politics and less in a wider comparative perspective. Against the backdrop of recent approaches to dynastic politics, role models, and agency, I will, first, discuss the gendered dimensions of Maximilian's dynastic politics in their wider geo-political and socio-cultural context. I will, second, move beyond a focus on key dynastic actors to take into account personal networks as fundamental for any type of premodern rule. Following court ladies and female servants and the social networks they were part of I will outline the interrelations between social ascent, office, and the politics of kinship and gender at court.

The distribution-free chain ladder of Mack justified the use of the chain ladder predictor and enabled Mack to derive an estimator of conditional mean squared error of prediction for the chain ladder predictor. Classical insurance loss models, that is of compound Poisson type, are not consistent with Mack’s distribution-free chain ladder. However, for a sequence of compound Poisson loss models indexed by exposure (e.g., number of contracts), we show that the chain ladder predictor and Mack’s estimator of conditional mean squared error of prediction can be derived by considering large exposure asymptotics. Hence, quantifying chain ladder prediction uncertainty can be done with Mack’s estimator without relying on the validity of the model assumptions of the distribution-free chain ladder.

Why do some conspiracy theories (CTs) remain popular and continue to spread on social media while others quickly fade away? Situating conspiracy theories within the literature on social movements, we propose and test a new theory of how enduring CTs maintain and regain popularity online. We test our theory using an original, hand-coded dataset of 5,794 tweets surrounding a divisive and regularly commemorated set of CTs in Poland. We find that CTs that cue in-group and out-group threats garner more retweets and likes than CT tweets lacking this rhetoric. Surprisingly, given the extant literature on party leaders’ ability to shape political attitudes and behaviors, we find that ruling party tweets endorsing CTs gain less engagement than CT tweets from non-officials. Finally, when a CT’s main threat frames are referenced in current events, CTs re-gain popularity on social media. Given the centrality of CTs to populist rule, these results offer a new explanation for CT popularity—one focused on the conditions under which salient threat frames strongly resonate.

The Younger Toba Tuff (YTT) eruption is regarded as one of the largest of its time and possibly responsible for changing past climate and vegetation from C3 to C4 in the Indian subcontinent. A paleosol constituting a Toba pre-tephra horizon at the Jwalapuram locality, exhibits the preservation of biogenic structures identified as Vondrichnus planoglobus and Vondrichnus obovatus. This study investigated their paleoecological and paleoenvironmental significance. These structures are hard and compact, rounded to sub-rounded, spherical to sub-spherical bodies with empty chambers, surrounded by carbonate layers, and preserved in close proximity to termite pipes and nests and rhizolith structures. Their occurrence in the Jwalapuram area is significant, as the locality has been well documented as suitable for reconstruction of past climate and vegetation in light of the impact of the YTT eruption. Based on the present findings, we assume that the investigated locality would likely have an insect population and bush to scrub vegetation, indicating a dry environment immediately before the YTT eruption.

Radiocarbon (14C) methodology was used to investigate the presence of biocarbon in different bio-based disposable packaging products. Packaging waste contributes to a municipal solid waste, which is increasing environmental concerns and resulting in the enhancement of EU regulations that aim to reduce packaging waste. The 14C amount in samples reflects how much of the biocarbon has been used. In this study, the concentration of 14C was determined in commonly used types of disposable packaging, such as cups, plates, straws, cutlery, and baking paper. Samples were made of materials such as paper, wheat bran, sugarcane, and wood. The mean concentration of the 14C isotope, measured by the accelerator mass spectrometry (AMS) technique, is greater than 100 pMC in all tested samples, indicating that the samples are modern. The relatively high 14C concentration values in the waterproof layer of the sample indicate that bioplastic, rather than plastic, was used in its production. The highest 14C isotope concentration values were measured for samples that used the oldest biomass (wood and paper), and the lowest for products from current crops (sugarcane and wheat bran), which is consistent with the trend of changes in 14C concentration in the biosphere. The study also addresses the problem of heterogeneity and representativeness of subsamples.

This article traces characterizations of the Cupbearer fresco, named after the large vessel the figure holds and uncovered at the site of Knossos in 1900, in light of the research agendas about the ‘races’ of the prehistoric Aegean and traditions of racial science current in late Victorian Britain. The head of the Cupbearer was compared to Classical Greek art, modern Cretan populations, and cranial remains from prehistoric contexts. Drawing from academic publications, articles in the press, and reports of the British Association for the Advancement of Science, the author situates the discourse surrounding the Cupbearer in the context of scholars seeking the origins of ‘European’ civilization in prehistory, and the creation of racial typologies, especially using cranial measurements and photography. The Cupbearer gained a dual status as a racial portrait comparable to past and present human populations, but also as a work of art that prefigured the later achievements of Classical Greece.

Deep neural networks are said to be opaque, impeding the development of safe and trustworthy artificial intelligence, but where this opacity stems from is less clear. What are the sufficient properties for neural network opacity? Here, I discuss five common properties of deep neural networks and two different kinds of opacity. Which of these properties are sufficient for what type of opacity? I show how each kind of opacity stems from only one of these five properties, and then discuss to what extent the two kinds of opacity can be mitigated by explainability methods.