The Silurian of Podolia, Ukraine, is renowned for its arthropod fauna, including eurypterids and the synziphosurine Pasternakevia. Here, we describe one of several new arthropods recently discovered in the vicinity of the Smotrych River. Smotrychaspis kurtopleurae gen. et sp. nov. is a synziphosurine euchelicerate with semicircular carapace lacking eyes, an unfused opisthosoma with 11 visible segments, the posterior tergites wide and bearing falcate epimera and a relatively long and stout telson. Smotrychaspis resembles pseudoniscid and bunodid synziphosurines but cannot be placed in either of these families.

Negotiations by more than 180 States during the Intergovernmental Negotiating Committee (INC) session 5.2 to develop a legally binding instrument with the purpose to end plastic pollution have, once again, concluded without a treaty. This is especially disastrous for developing States and marginalized peoples (such as indigenous communities and waste pickers), who are disproportionately suffering from plastic pollution. In this article, we show that developing States were underrepresented at the INC-5.2 negotiations in Geneva: Their delegations were on average only half as large (~5 delegates) when compared to delegations from Western European States (~13 delegates) and those from States with a high and very high Human Development Index (~10 delegates). In addition, more than 230 industry representatives participated in INC-5.2, exerting influence in diverse ways, both during official negotiations and through side events, organized by lobbying organizations. Finally, we discuss the importance of how treaty negotiations were organized: Simultaneously occurring negotiation formats (such as contact groups and informal meetings) put smaller delegations at a disadvantage, causing procedural injustice, which falls under the responsibility of the INC Secretariat.

This short report provides the first observations of deep-sea corals belonging to the class Octocorallia and order Antipatharia surveyed during the KM24-03 Leg 2 cruise in the waters around Minamidaito and Kitadaito Islands in Okinawa, Japan between approximately 200 and 1,000 m. It also lists and illustrates the specimens that were collected. Based on field observations, deep-sea corals occupied the niches inside and around caves and crevices, as well as non-cave environments such as flat seabeds and slopes. Our morphological and phylogenetic analyses of the collected specimens revealed the presence of Callogorgia cf. korema, Pleurocorallium inutile, and Acanthopathes undulata. We provide the first documentation of deep-sea corals found in this area, as well as extend the known geographic distribution of these species. In particular, the black coral A. undulata, which until now has only been reported from the western and central Pacific Ocean, is reported for the first time in the northwestern Pacific. Our preliminary findings warrant further investigation and more stringent protection of the deep-sea species and habitats found in the waters around these karstic islands from anthropogenic impacts, perhaps with inclusion in regional Marine Protected Areas.

The Chalbi Desert, located in eastern Africa, is a significant but overlooked archive of the Pleistocene and Holocene periods that could add insight into investigations on human evolution. We revisited southeastern Chalbi Desert landforms between the towns of Kargi and Maikona to improve the chronostratigraphy and provide paleoenvironmental context. Direct U-series and electron spin resonance dating of various fossil teeth recovered from a deflated dune (Qzs) landform at the Farre locality return a mean age of ∼545 ka, which is compatible with biostratigraphic inferences. While this numerical age result should probably be regarded as mostly indicative given the existing uncertainty on the environmental dose rate evaluation, the data set available nevertheless strongly suggests a Middle Pleistocene age for at least some of the fauna. Sedimentology, luminescence, and 14C dating further suggest that this Qzs landform and its contents were modified by alluvial fan development and weathering during denudation in a proximal fan setting through the late Pleistocene into the Holocene. The Qzs landform currently experiences aeolian additions, erosion, and salt-affected soil development in an arid climate. Pedogenic carbonate isotope geochemistry suggests that deflated sand dunes were covered by woody grasslands during Marine Isotope Stage (MIS) 4 and 3 pluvials, consistent with nearby fan progradation constrained at >35 ka. The desert experienced increased hydrologic activity during late Pleistocene and African humid period pluvials, as evidenced by additional optically stimulated luminescence and 14C dating from fan, dune, and playa contexts. The last significant pluvial episode ended after 4.4 ± 0.3 cal ka BP, which coincides with the final regression of nearby Lake Turkana. This study extends the chronology of Quaternary sediments in the Chalbi Desert to the Middle Pleistocene and offers paleoenvironmental insights into the conditions experienced by Middle Stone Age tool users in the region.

Host specificity in symbionts is a key factor driving their phylogenetic diversification. However, since the host utilization of symbionts can be influenced by environmental heterogeneity and the presence of potential hosts, a careful evaluation is necessary to clearly determine the host specificity. Stylochoplana parasitica is an acotylean flatworm that inhabits the mantle groove of the intertidal chiton Liolophura japonica around Japan. The Stylochoplana flatworms, including this species, are suggested to have evolved host specificity that has influenced their phylogenetic divergence. In this study, host specificity was examined based on field and laboratory observations. A field survey revealed that S. parasitica was exclusively found on L. japonica and not on the sympatric chiton Acanthochitona defilippii. A laboratory experiment confirmed that S. parasitica selectively attached to L. japonica, with significantly fewer individuals attaching to A. defilippii. These results suggest that the host specificity of S. parasitica is not shaped by environmental factors, but is likely the result of host adaptation. This study emphasizes the importance of combining field surveys and laboratory experiments in evaluating host specificity.

The Bohai coast loess deposits hold significant value for understanding climate and sea-level changes. This review analyzes stratigraphic and chronological data and arrives at three main conclusions. (1) Liaodong Peninsula loess is 10–25 m thick, primarily distributed in nearshore bay areas with NW slope aspect. In the Shandong Peninsula coastal zone, thickness measures 5–15 m, showing NW aspect in Penglai but southward in Yantai. Thickness variations correlate with sedimentation rates and underlying terrain gradient, while slope aspects indicate sediment sources and topographic controls. (2) Loess along the Bohai coast rapidly accumulated during 22–31 ka and 61–68 ka, lasting longer (18–70 ka) in the Shandong Peninsula coastal area and the Miaodao Archipelago due to Yellow River input. Around 150 ka, regional differences emerged (e.g., loess in the Shandong Peninsula coastal area and the Miaodao Archipelago experienced rapid deposition at 148–175 ka). Liaodong Peninsula ages before 125 ka are underestimated, likely due to inaccurate quartz dating. (3) The paleosols mainly developed during 4–15 ka, 75–85 ka, 90–100 ka, and 125–130 ka. The Shandong Peninsula coastal area and Miaodao Archipelago show more layers and greater thickness of paleosols compared with the Liaodong Peninsula, which is related to the differences in hydroclimate conditions and loess grain size.

The retreat of the Antarctic Peninsula Ice Sheet since the Last Glacial Maximum provides key insights into ice-sheet dynamics, climate interactions and sea-level fluctuations. Terrestrial cosmogenic nuclide (TCN) dating of glacial deposits on the western Antarctic Peninsula (WAP) offers valuable temporal and spatial information regarding this retreat. However, many erratic deposits are found near the present sea level on the WAP archipelagos, limiting the applicability of TCN dating. This is because some of these deposits were previously submerged and later emerged due to ongoing post-glacial isostatic uplift and global sea-level rise. Here, for the first time on the Antarctic Peninsula, we present TCN dating results for emerged erratic boulders and bedrock samples located below the post-glacial marine limit of the WAP. Samples were collected from three islands along a latitudinal range from 64°S to 68°S: Nansen Island in Wilhelmina Bay (n = 4), Galindez Island in the Argentine Islands-Kyiv Peninsula region (n = 5) and Horseshoe Island on the northern coast of Marguerite Bay (n = 1). Our study indicates that nearshore boulder emergence occurred sometime between 1.4 ± 0.3 and 3.8 ± 0.3 ka ago on the WAP. The bedrock samples on Galindez Island provide somewhat older ages (17.9 ± 2.8 and 11.8 ± 1.9 ka), indicating the earliest emergence following deglaciation of the WAP. We discuss the challenges associated with sampling emerged erratic boulders along the Antarctic Peninsula shorelines and propose methods for overcoming these complications.

In The Structure of Evolutionary Theory, Stephen Jay Gould observed that the theory of punctuated equilibria formed “the coordinating centerpiece” of his work in evolutionary biology. It occupied this position because it bridged several themes in Gould’s thought, including the necessity of understanding evolution in a hierarchical context and a critique of the adaptationist program in evolutionary biology. Yet this assessment concealed a historical puzzle. The puzzle arose from the fact that the Gould of “Eldredge and Gould (1972)” held several commitments that the older Gould did not. These included a preference for adaptationist explanations and, perhaps more surprising, a commitment to the central importance of “biological improvement” in the history of life. So, how did punctuated equilibria come to play a coordinating role within a view of evolution that differed starkly from the one Gould held in 1972? And why did it only begin to play this role after 1977? This article answers these questions, focusing on the aims of Gould’s early research program and its transformation in response to external stimuli. In so doing, it illuminates an important and frequently misunderstood episode in the history of paleobiology.