One new species and one new record species of Sphaerolaimus (Nematode, Sphaerolaimidae) in offshore wetlands, China

Summary One new Comesoma Bastian, 1865 species and one known Sphaerolaimus species are described from the intertidal areas of a sand beach and mangrove wetland, respectively, in Beihai City, P.R. China (South China Sea) using morphological and molecular data. Comesoma sinica n. sp. is characterised by body length 2366-2925 μm, long cephalic setae 24-32 μm, cuticle without lateral differentiation, spiral amphids with 2.5 turns, bent spicules and 3.5-4.3 cloacal body diam. long, gubernaculum parallel with spicules, and males with 20 minute precloacal supplements in the form of small pores. Molecular analyses of 18S rDNA and 28S rDNA indicate that Comesoma sinica n. sp. is closely related to other Comesomatidae genera. Sphaerolaimus callisto Zograf, Pavlyuk, Trebukhova & Nguyen, 2020, which was originally described from an estuary of northern Vietnam, the South China Sea, is characterised by long spicules and vulva situated far posterior to mid-body (82% of body length from anterior extremity), and is recorded from mangrove wetlands in Beihai City. In addition, as Sphaerolaimus longispiculatus Yang, Liu & Guo, 2021 is highly similar to S. callisto in morphology, these two species should be synonymised. Phylogenetic analyses of 18S rDNA show that S. callisto is closely related to other species of Sphaerolaimus.

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One new species of Comesoma Bastian, 1865 (Nematoda: Araeolaimida: Comesomatidae) and redescription with molecular characterisation of Sphaerolaimus callisto Zograf, Pavlyuk, Trebukhova & Nguyen, 2020 (Nematoda: Monhysterida: Sphaerolaimidae) from the South China Sea

Cai

Leduc

et al. 2022

Nematol.

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Two New Free-Living Marine Nematode Species of the Genus Haliplectus Cobb, 1913 (Haliplectidae) from Mangroves of Shenzhen, Guangdong Province, China

Zhou

Chen

Shih

et al. 2022

JMSE

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This study presents two new free-living marine nematodes, Haliplectus major sp. nov. and Haliplectus futianisus sp. nov., from a mangrove reservation in Shenzhen, China. Haliplectus major sp. nov. can be distinguished by its total body length of 1615–1998 µm; a cuticle annulated with eight rows of cuticle pores; amphidial fovea at 9–12 µm from the anterior end; a bipartite basal bulb with striated valve plates in both sexes; five to seven closely spaced precloacal supplements in males; a didelphic reproductive system in females, with the vulva at 49.64–52.37% of body length; and sexual dimorphism in tail shape, arcuate-conoid and 2.3–3.2 times anal body diameter long in males and elongate-conid and 3.5–4.2 times anal body diameter long in females. Haliplectus futianisus sp. nov. is characterized by a total body length of 574–655 µm; a cuticle annulated with eight rows of cuticle pores; amphidial fovea at 8–11 µm from the anterior end; a monopartite basal bulb with unstriated valve plates in both sexes; an absence of precloacal supplements in males; and a didelphic reproductive system in females, with the vulva at 42.33–45.63% of body length. The identification was confirmed by analyzing morphological characteristic and 18S rRNA gene sequences. The maximum likelihood (ML) topology was regarded as morphological evidence of H. major sp. nov. and H. futianisus sp. nov. being two distinct species.

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One new species and one new record species of Sphaerolaimus (Nematode, Sphaerolaimidae) in offshore wetlands, China

Cited by 2 publications

References 9 publications

One new species of Comesoma Bastian, 1865 (Nematoda: Araeolaimida: Comesomatidae) and redescription with molecular characterisation of Sphaerolaimus callisto Zograf, Pavlyuk, Trebukhova & Nguyen, 2020 (Nematoda: Monhysterida: Sphaerolaimidae) from the South China Sea

One new species of Comesoma Bastian, 1865 (Nematoda: Araeolaimida: Comesomatidae) and redescription with molecular characterisation of Sphaerolaimus callisto Zograf, Pavlyuk, Trebukhova & Nguyen, 2020 (Nematoda: Monhysterida: Sphaerolaimidae) from the South China Sea

Two New Free-Living Marine Nematode Species of the Genus Haliplectus Cobb, 1913 (Haliplectidae) from Mangroves of Shenzhen, Guangdong Province, China

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