Three new species of Macrostomum (Platyhelminthes, Macrostomorpha) from China and Australia, with notes on taxonomy and phylogenetics

By

Shi, Yongshi
Zeng, Zhiyu
Wang, Jia
Zhang, Si-Yu
Deng, Li
Wang, An-Tai

Type

Article

Date of Publication

2022-5-3

Original Publication

ZooKeys

Volume

1099

Pages

1--28

Subjects

18S rDNA , 28S rDNA , COI , flatworm , taxonomy

Contributed by

Pensoft Publishers

Language

English

Published by

Sofia, Bulgaria Pensoft Publishers

Identifiers

DOI: https://doi.org/10.3897/zookeys.1099.72964

 

Abstract

In this paper, three species of the macrostomid free-living flatworm genus Macrostomum are described. Two species, Macrostomum littorale Wang & Shi, sp. nov. and M. shekouense Wang & Shi, sp. nov., were collected from coastal water at Shenzhen, Guangdong Province, China. One species, M. brandi Wang & Shi, sp. nov., was collected from Perth, Western Australia and Queenscliff, Victoria, Australia. Macrostomum littoralesp. nov. differs from congeneric species within the genus in the length of the stylet, diameter of stylet opening, and the bend of the stylet. Macrostomum shekouensesp. nov. and M. brandisp. nov. differ from similar species within the genus in the stylet morphology, position of the female antrum and developing eggs, or presence or absence of the false seminal vesicle. Phylogenetic analysis based on cytochrome c oxidase subunit I (COI) gene shows that M. littoralesp. nov. and M. hystrix are sister clades on two well-separated branch, M. shekouensesp. nov. and M. brandisp. nov. are sister clades on two well-separated branches. Accordingly, both morphological and molecular evidence support M. littoralesp. nov., M. shekouensesp. nov., and M. brandisp. nov. as three new species.