Three new species and one subspecies of the Amynthas corticis-group from Guangxi Zhuang Autonomous Region, China (Oligochaeta, Megascolecidae).

Yan Dong,Michelle Man Suet Law,Jiangping Qiu,Jibao Jiang

doi:10.3897/zookeys.884.30988

Yan Dong, Michelle Man Suet Law + Show 2 more

Open Access

https://doi.org/10.3897/zookeys.884.30988

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Journal: ZooKeys	Publication Date: Oct 30, 2019
Citations: 2	License type: CC BY 4.0

Affiliation: Hong Kong Baptist University

Abstract

Three new species and one subspecies of the genus Amynthas are described from Guangxi Zhuang Autonomous Region, China: The new species are: Amynthas maximus Qiu & Dong, sp. nov. and Amynthas tortuosus Qiu & Dong, sp. nov., and Amynthas shengtangmontis Dong & Jiang, sp. nov., the subspecies is Amynthas shengtangmontis minusculussubsp. nov. All have four pairs of spermathecal pores in 5/6–8/9, which indicates that they should belong to the corticis-group. Their morphological characteristics are compared to other similar species in the corticis-group from China and other Asian countries, such as Amynthas pulvinus Sun & Jiang, 2013, Amynthas homosetus (Chen, 1938), Amynthas corticis (Kinberg, 1867), Amynthas dorsualis Sun & Qiu, 2013, and Amynthas carnosus (Goto & Hatai, 1899). In addition, the results presented are confirmed by the pairwise comparison of COI barcode sequences. The pairwise distances between each new species and the other eighteen corticis-group species are greater than 14.7% on average. Furthermore, the pairwise distance between A. shengtangmontis shengtangmontis and A. shengtangmontis minusculus is 10.7–11.4%.

Highlights

The genus Amynthas Sims & Easton, 1972 is the dominant genus of Megascolecidae in China (Jiang 2016, Zhao 2015) and the Amynthas corticis-group consists of a large number of species
DNA was extracted from several specimens of A. maximus, A. tortuosus, A. shengtangmontis shengtangmontis, and A. shengtangmontis minusculus using the EZNA Mollusk DNA Kit (Omega Bio-tek, Norcross, GA, USA)
We further compare the new species with another species Amynthas dorsualis Sun & Qiu, 2013 described from Hainan, China, and its clitellum occupies fewer than three segments

Summary

Introduction

The genus Amynthas Sims & Easton, 1972 is the dominant genus of Megascolecidae in China (Jiang 2016, Zhao 2015) and the Amynthas corticis-group consists of a large number of species. We further compare the new species with another species Amynthas dorsualis Sun & Qiu, 2013 described from Hainan, China, and its clitellum occupies fewer than three segments.

Results

Conclusion