Description of a new marine flatworm of Prosthiostomum (Platyhelminthes, Polycladida, Prosthiostomidae) from the South China Sea

A new species of the polyclad genus Prosthiostomum is described from the intertidal zone of the South China Sea, Huidong, China, based on morphological and molecular analyses. Prosthiostomum huidongense sp. nov. is characterized by i) few marginal eyes scattered between the marginal band and the cer...

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Bibliographic Details
Published in:Zoosystematics and Evolution 2024-04, Vol.100 (2), p.437-445
Main Authors: Liu, Hai-Long, Lin, Da-Hao, Wang, An-Tai, Hu, Zhang-Li, Zhang, Yu
Format: Article
Language:English
Subjects:
Body length
Body wall
Environmental science
Laboratories
Morphology
New species
Phylogenetics
Phylogeny
Physical characteristics
Prosthiostomum
Thermal cycling
Worms
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Summary:A new species of the polyclad genus Prosthiostomum is described from the intertidal zone of the South China Sea, Huidong, China, based on morphological and molecular analyses. Prosthiostomum huidongense sp. nov. is characterized by i) few marginal eyes scattered between the marginal band and the cerebral eyes; ii) sucker located at two-thirds of the body length, being removed from the female gonopore by twice the distance between the male and female gonopores; iii) shallow male atrium with slightly ruffled inner wall, positioned approximately perpendicular to the body wall. Molecular phylogenetic analyses based on 28S rDNA sequence showed that the new species was nested in a clade composed of Prosthiostomum species. The uncorrected p-distance of COI between P. huidongense sp. nov. and other Prosthiostomum species ranged from 20.3 to 24.3%, and the high genetic divergence further supports P. huidongense as a new species.
ISSN:1435-1935
1860-0743
DOI:10.3897/zse.100.114482