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9 March 2021 Two New Brackish-Water Species of Macrostomum (Platyhelminthes: Macrostomorpha) from China and Their Phylogenetic Positions
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Abstract

In this paper, two new brackish-water species of the macrostomid turbellarian genus Macrostomum, Macrostomum pseudosinense sp. nov. and Macrostomum taurinum sp. nov., collected from coastal water at Shenzhen, Guangdong Province, China, are described based on morphological, histological, and molecular phylogenetic analyses. Macrostomum pseudosinense sp. nov. differs from similar species within the genus in the length of the stylet (152 ± 15.0 µm), diameter of stylet opening (20 ± 4.0 µm proximally; 7 ± 0.5 µm distally), two bends of the stylet, and the non-spiral end of the stylet. Macrostomum taurinum sp. nov. differs from its congeners in the length of the stylet (81 ± 7.4 µm), the stylet bending position and angle (50% and 60°), diameter of stylet proximal opening (15 ± 3.0 µm), sperm with bristles and brush, and the smooth-walled ovaries. Phylogenetic analyses inferred from nuclear 18S and 28S rRNA genes support the establishments of these two new species. In addition, reciprocal mating behavior of M. pseudosinense sp. nov. was observed and documented.

© 2021 Zoological Society of Japan
Siyu Zhang, Yongshi Shi, Zicheng Zeng, Fan Xin, Li Deng, and Antai Wang "Two New Brackish-Water Species of Macrostomum (Platyhelminthes: Macrostomorpha) from China and Their Phylogenetic Positions," Zoological Science 38(3), 273-286, (9 March 2021). https://doi.org/10.2108/zs200121
Received: 24 July 2020; Accepted: 15 December 2020; Published: 9 March 2021
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