

FOLLOWUS
College of Life Sciences, Liaocheng University, Liaocheng 252059, China
wangchunming@lcu.edu.cn
Received:14 June 2024,
Published:01 July 2025
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MENG Zhiyu,GUO Wen,WANG Chunming.Description of two new species, Sphaerolaimus obesus sp. nov. and Pseudosteineria articulata sp. nov. (Nematoda, Sphaerolaimoidea) from the Yellow Sea, China and phylogenetic analysis within superfamily Sphaerolaimoidea with combined ribosome DNA sequences[J].Journal of Oceanology and Limnology,2025,43(04):1320-1333.
MENG Zhiyu,GUO Wen,WANG Chunming.Description of two new species, Sphaerolaimus obesus sp. nov. and Pseudosteineria articulata sp. nov. (Nematoda, Sphaerolaimoidea) from the Yellow Sea, China and phylogenetic analysis within superfamily Sphaerolaimoidea with combined ribosome DNA sequences[J].Journal of Oceanology and Limnology,2025,43(04):1320-1333. DOI: 10.1007/s00343-024-4153-2.
Two new species of superfamily Sphaerolaimoidea:
Sphaerolaimus
obesus
sp. nov. and
Pseudosteineria
articulata
sp. nov. are described from the Yellow Sea.
Sphaerolaimus
obesus
sp. nov. is characterized by body stout
cuticle finely striated with lateral alae
outer labial sensilla and cephalic sensilla papilliform
eight bunches of subcephalic setae different in length
amphidial fovea situated at the level of buccal cavity
spicules arcuated with proximal end cephalated
gubernaculum with dorsal-caudal directed apophysis different in shape
seven precloacal papilliform supplements
tail conico-cylindrica
l with three terminal setae.
Pseudosteineria
articulata
sp. nov. is characterized by cuticle distinctly annulated with lateral alae
six outer labial setae jointed
eight rows of subcephalic setae present
two rows of long somatic setae scattered along lateral alae
amphidial fovea posterior to subcephalic setae
spicules curved and jointed with proximal end with large manubrium
gubernaculum slightly funnel-shaped
tail conico-cylindrical. Phylogenetic analysis based on combined rDNA sequences place
Sphaerolaimus
obesus
sp. nov. and
Pseudosteineria
articulata
sp. nov. within family Sphaerolaimidae and Xyalidae
respectively. Relationships analysis within the superfamily Sphaerolaimoidea shows Sphaerolaimidae as a sister clade to Xyalidae and genera of Xyalidae as paraphyletic clades.
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