National Museum of Nature and Science

Taxonomic study of the family Pedicellasteridae (Asteroidea: Forcipulatida) from Japanese waters, with descriptions of two new species and one new record

Two new deep-sea species of the family Pedicellasteridae from Japanese waters – Ampheraster phantasma sp. n. and Anteliaster seisuiae sp. n. – are described. These new species represent the first discovery of the genera Ampheraster and Anteliaster from this region. We also report...

The parent bodies of Ryugu and Ivuna formed before those of other carbonaceous chondrites

Most carbonaceous chondrite (CC) meteorites contain abundant chondrules, millimeter-scale spherical inclusions of previously molten material. Ivuna-type carbonaceous chondrites (CIs) do not contain chondrules, nor do samples of the carbonaceous asteroid Ryugu. CIs and Ryugu share...

Titanosaur eggshells from the latest Cretaceous of Patagonia, Argentina: implications for nesting at high latitude

Abstract Dinosaur egg remains are rarely found in areas of high palaeolatitudes, with Canada (approx. 57–60° N) and Siberia (approx. 70–75° N) yielding the most polarward occurrences. Here, we describe dinosaur eggshells from the Upper Cretaceous (Maastrichtian) Chorrillo Formati...

Negative-Muon Depth Profiling Reveals Near-Surface Gold Enrichment in Historical Shachihoko Scales from Nagoya Castle

Surviving fish-scale plates from the golden shachihoko (Kin-shachi) ornaments of Nagoya Castle are rare historical gold–silver (Au–Ag) materials. Recent X-ray fluorescence (XRF) analysis and color measurements indicated a discrepancy between the bulk Au concentration and the visi...