カニの「横歩き」は約2億年前に始まったか 長崎大など研究
A recent study suggests that crabs may have started walking sideways approximately 200 million years ago. This research, conducted by a group from Nagasaki University, provides insights into the evolution of animal locomotion. The findings could enhance our understanding of how movement styles in animals have developed over time.
- ▪The study indicates that crabs began their sideways movement around 200 million years ago.
- ▪The research was conducted by a group from Nagasaki University.
- ▪These findings contribute to the understanding of the evolution of animal movement.
Story provenance
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Story provenance
Attribution is not the same as permission. This drawer separates discovery metadata, excerpts, WeSearch-generated summaries, reuse status, and whether the publisher receives the visit. Nothing here claims a legal grant the publisher has not made.
Record
| Original publisher | NHKニュース |
| Canonical URL | http://www3.nhk.or.jp/news/html/20260429/k10015110381000.html |
| Publication time | Wed, 29 Apr 2026 04:06:50 +0900 |
| Retrieval time | 2026-04-28T19:22:13.053Z |
| Last seen | 2026-04-28T19:22:13.053Z |
| Headline source | Publisher (no WeSearch rewrite) |
| Excerpt source | publisher body |
| Excerpt method | First ~120 words (~800 chars) of extracted publisher body, fair-use limited. |
| Summary | WeSearch · cerebras-chat (WeSearch summarizer) |
| Summary source text | contentText |
| Citation coverage | Summary is a WeSearch-generated derivative; primary citation is the original publisher URL. |
| Cluster | None |
| Cluster logic | Not yet clustered, or no peer story found in the clustering window. |
| Ranking reason | Story pages are not engagement-ranked. Hub feeds use recency, with optional source-diversified chronological ordering (cap consecutive stories per source). No personalized ranking. |
| Publisher visit | Yes — open original |
| Substitutes article? | No — link-out required for full text |
Rights status (four layers)
WeSearch handling by dimension
| Indexing | May the item be indexed (stored, ranked, made findable)? | Allowed |
| Snippet | May a short excerpt of the publisher's text be shown? | Allowed |
| AI summary | May WeSearch generate its own short summary of the article? | Limited |
| Retrieval / RAG | May the content be exposed for third-party retrieval-augmented generation? | Not asserted |
| Model training | May the content be used to train AI models? | Not asserted |
| Commercial reuse | May the content be reused commercially? | Not permitted |
Basis: Derived from the published RSS/Atom feed. Contact: [email protected]. Reviewed: 2026-07-24.
Opening excerpt (first ~120 words) tap to expand
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Excerpt limited to ~120 words for fair-use compliance. The full article is at NHKニュース.
