Jisho

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いかせき 生きている化石
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Expressions (phrases, clauses, etc.), Noun
1. living fossil​
Wikipedia definition
2. Living fossil​Living fossil is an informal term for any living species of organism which appears to be the same as a species otherwise only known from fossils and which has no close living relatives. These species have all survived major extinction events, and generally retain low taxonomic diversities. A species which successfully radiates (forming many new species after a possible genetic bottleneck) has become too successful to be considered a "living fossil".
Read “Living fossil” on English Wikipedia
Read “生きている化石” on Japanese Wikipedia
Read “Living fossil” on DBpedia

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