What does this research mean for the field?

Two newly identified earthworm taxa, Amynthas longnanensis and Amynthas pectiniferus guanzhongensis, exist in northwestern China, and mitogenomic analysis demonstrates that their assigned A. sieboldi species group is not monophyletic. Novelty: ClaimNovelty.NOVEL_FINDING. Consensus alignment: ConsensusAlignment.CHALLENGES_CONSENSUS.

What question did this study set out to answer?

To describe new taxa of earthworms from the genus Amynthas and assess their phylogenetic relationships.

August 13, 2026Subterranean BiologyOpen Access

A new species and a new subspecies of Amynthas Kinberg, 1867 earthworms (Oligochaeta, Megascolecidae) from northwestern China with data from the mitochondrial genome

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To describe new taxa of earthworms from the genus Amynthas and assess their phylogenetic relationships.
Described two new taxa, Amynthas longnanensis and Amynthas pectiniferus guanzhongensis.
Employed COI barcoding and mitogenomic phylogenetic analysis to support species delimitation.
Analyzed morphological features and distributional data to fill geographic gaps.
Both new taxa were confirmed as distinct lineages within the A. sieboldi group.
Phylogenetic analysis indicates that the A. sieboldi group is not monophyletic.
Findings expand understanding of earthworm diversity and distribution in northwestern China.

Implication

Randomized trial describes new species and subspecies of Amynthas in northwestern China, suggesting greater earthworm diversity.

Abstract

Two new taxa of the earthworm genus Amynthas Kinberg, 1867 are described from northwestern China: Amynthas longnanensis sp. nov . from Longnan, Gansu Province, and Amynthas pectiniferus guanzhongensis ssp. nov . from Weinan, Shaanxi Province. Both belong to the A. sieboldi group, characterized by three pairs of spermathecal pores in 6/7–8/9. Species delimitation based on COI barcoding (ASAP and GMYC) and phylogenetic analysis using mitogenomic protein-coding genes (PCGs) support their recognition as distinct lineages. The mitogenomic phylogeny reveals that the A. sieboldi group as currently defined is not monophyletic. The new findings fill a distributional gap of Amynthas in northwestern China and provide new morphological and molecular data for understanding earthworm diversity.

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Cite This Study

A 2026 study studied this question.

synapsesocial.com/papers/6a7d75ad2b0e0cff3f63e84f https://doi.org/10.3897/subtbiol.57.198999

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Implication

Randomized trial describes new species and subspecies of Amynthas in northwestern China, suggesting greater earthworm diversity.

A new species and a new subspecies of Amynthas Kinberg, 1867 earthworms (Oligochaeta, Megascolecidae) from northwestern China with data from the mitochondrial genome

Key Points

Implication

Abstract

Discussion

Cite This Study

A new species and a new subspecies of Amynthas Kinberg, 1867 earthworms (Oligochaeta, Megascolecidae) from northwestern China with data from the mitochondrial genome

Key Points

Implication

Abstract

Discussion

Cite This Study

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