Three new free-living marine nematode species of Dorylaimopsis (Nematoda: Araeolaimida: Comesomatidae) from the South China Sea and the Chukchi Sea

Zootaxa ◽  
2019 ◽  
Vol 4608 (3) ◽  
pp. 433 ◽  
Author(s):  
SUJING FU ◽  
DANIEL LEDUC ◽  
YIYONG RAO ◽  
LIZHE CAI
Keyword(s):  
South China Sea ◽  
South China ◽  
Chukchi Sea ◽  
The South China Sea ◽  
Valid Species ◽  
Marine Nematode ◽  
The South ◽  
Free Living ◽  
Pharyngeal Bulb ◽  
China Sea

Three new species of the free-living marine nematode genus Dorylaimopsis are described from the South China Sea and the Chukchi Sea. Dorylaimopsis longispicula sp. n. is characterized by cuticle with lateral differentiation consisting of four longitudinal rows of larger dots in pharyngeal and tail regions, two rows of larger dots elsewhere, long curved spicules, and 12–16 tubular precloacal supplements. Dorylaimopsis boucheri sp. n. is characterized by lateral differentiation consisting of 3–4 longitudinal rows of larger dots in males and 4–6 rows in females, beginning about 30 μm posterior to amphids and terminating at the conical portion of the tail, 13–16 tubular precloacal supplements, and distal part of tail cylindrical without terminal setae. Dorylaimopsis jinyuei sp. n. is characterized by cuticle with lateral differentiation in the form of longitudinal rows of larger dots in two separate regions, not along entire body. One region is from posterior edge of amphid to anterior of intestine or anterior border of pharyngeal bulb in some females (4–7 longitudinal rows), the other is the tail region (5–7 longitudinal rows). In this paper, Dorylaimopsis metatypica Chitwood, 1936 is transferred to Hopperia because it is characterized by lateral differentiation consisting of larger, irregularly-distributed coarse dots (as in Hopperia), and Hopperia communis Gagarin & Nguyen, 2006 is transferred to Dorylaimopsis based on the presence of longitudinal rows of coarse dots and a cylindrical buccal cavity in most specimens of this species. A dichotomous key to valid species of Dorylaimopsis Ditlevsen, 1918 is provided. 

Anthias albofasciatus Fowler and Bean, 1930, a junior synonym of Tosana niwae Smith and Pope, 1906 (Teleostei: Serranidae: Anthiadinae)

Zootaxa ◽  
2019 ◽  
Vol 4614 (3) ◽  
pp. 566
Author(s):  
ANTHONY C. GILL ◽  
WILLIAM D. JR ANDERSON ◽  
JEFFREY T. WILLIAMS
Keyword(s):  
Hong Kong ◽  
South China Sea ◽  
South China ◽  
The South China Sea ◽  
Valid Species ◽  
The South ◽  
Type Specimens ◽  
China Sea ◽  
Eastern Japan ◽  
Subjective Synonym

Anthias albofasciatus Fowler & Bean, known only from the holotype collected east of Hong Kong in the South China Sea, has been considered a valid species of either Anthias or Pseudanthias. The holotype is compared with the holotype of Tosana niwae Smith & Pope from Urado Bay, Shikoku, Japan, as well as non-type specimens from the South China Sea and south-eastern Japan, and shown to be conspecific. Anthias albofasciatus is therefore considered a junior subjective synonym of Tosana niwae. 

Wieseria bicepes sp. nov. (Nematoda: Oxystominidae) from the South China Sea

Zootaxa ◽  
2020 ◽  
Vol 4722 (4) ◽  
pp. 389-394
Author(s):  
SUSU JIA ◽  
YONG HUANG
Keyword(s):  
South China Sea ◽  
South China ◽  
The South China Sea ◽  
Present Species ◽  
Marine Nematodes ◽  
Congeneric Species ◽  
The South ◽  
Free Living ◽  
China Sea ◽  
Tail Tip

One unrecorded species of free-living marine nematodes from the South China Sea is described as Wieseria bicepes sp. nov. The present species is characterized by three circles of anterior sensilla nearly equal in length; four cephalic setae just behind the outer labial setae; oblong amphideal fovea with double contours and a handle-like protrusion at the base; tail tip bifurcate; spicules slightly curved with proximally cephalated and distally tapered; gubernaculum absent. The species is easily distinguished from the congeneric species by tail with a bifurcate tip and cephalic setae closely adjacent to labial setae. 

scholarly journals New identification of the moray eel Gymnothorax minor (Temminck & Schlegel, 1846) in China (Anguilliformes, Muraenidae)

ZooKeys ◽  
2018 ◽  
Vol 752 ◽  
pp. 149-161 ◽  
Author(s):  
Yuan Li ◽  
Liyan Zhang ◽  
Linlin Zhao ◽  
Ji Feng ◽  
Karhoe Loh ◽  
...  
Keyword(s):  
South China Sea ◽  
Dna Barcoding ◽  
South China ◽  
The South China Sea ◽  
The Body ◽  
Coi Gene ◽  
Valid Species ◽  
Distribution Area ◽  
The South ◽  
China Sea

A new identification of Gymnothoraxminor (Temminck & Schlegel, 1846) is documented based on morphological characteristics and DNA barcoding. Sixty-one individuals of G.minor were collected from the East China Sea and the South China Sea. This species was previously reported as Gymnothoraxreticularis Bloch, 1795 in China because of the similarity in external shape and color. Gymnothoraxminor can be easily distinguished from G.reticularis by its color pattern of 18–20 irregular dark brown vertical bars and the body having scattered small brown spots. Additionally, the teeth are uniserial on both jaws, and the vertebrae number 137–139. By combining congener sequences of the cytochrome oxidase I (COI) gene from GenBank, two groups were detected among all the COI sequences of the currently named G.minor, which further indicated that two valid species were present based on genetic distance. A divergence also occurred on the number of vertebrae between the northern and southern populations. The phylogenetic and morphological analysis strongly supports that the northern and southern populations of G.minor are two different species. Furthermore, the distribution area of the northern G.minor has expanded southward to 5°15'N in the South China Sea. More specimens of G.minor and G.reticularis are crucial in order to define their geographical distribution boundaries and provide the correct DNA barcoding.

scholarly journals Characterization of particle-associated and free-living bacterial and archaeal communities along the water columns of the South China Sea

2020 ◽  
Author(s):  
Jiangtao Li ◽  
Lingyuan Gu ◽  
Shijie Bai ◽  
Jie Wang ◽  
Lei Su ◽  
...  
Keyword(s):  
South China Sea ◽  
Microbial Communities ◽  
South China ◽  
Deep Ocean ◽  
Archaeal Community ◽  
The South China Sea ◽  
The South ◽  
Free Living ◽  
China Sea ◽  
Archaeal Communities

Abstract. There is a growing recognition of the role of particle-attached (PA) and free-living (FL) microorganisms in marine carbon cycle. However, current understanding of PA and FL microbial communities is largely on those in the upper photic zone, and relatively fewer studies have focused on microbial communities of the deep ocean. Moreover, archaeal populations receive even less attention. In this study, we determined bacterial and archaeal community structures of both the PA and FL assemblages at different depths, from the surface to the bathypelagic zone along two water column profiles in the South China Sea. Our results suggest that environmental parameters including depth, seawater age, salinity, POC, DOC, DO and silicate play a role in structuring these microbial communities. Generally, the PA microbial communities have relatively low abundance and diversity compared with the FL microbial communities at most depths. Further microbial community analysis revealed that PA and FL fractions generally accommodate significantly divergent microbial compositions at each depth. The PA bacterial communities mainly comprise members of Actinobacteria and γ-Proteobacteria, together with some from Bacteroidetes, Planctomycetes and δ-Proteobacteria, while the FL bacterial lineages are mostly distributed within α-, γ-Proteobacteria, Actinobacteria and Bacteroidetes, along with certain members from β-, δ-Proteobacteria, Planctomycetes and Firmicutes. Moreover, there is an obvious shifting in the dominant PA and FL bacterial compositions along the depth profiles from the surface to the bathypelagic deep. By contrast, both PA and FL archaeal communities dominantly consist of Marine Group II (MGII) and Marine Group I (MGI), together with variable minor Marine Group III (MGIII), Methanosarcinales, Marine Benthic Group A (MBG-A) and Woesearchaeota. However, the pronounced distinction of archaeal community compositions between PA and FL fractions are observed at finer taxonomic level. A high proportion overlap of microbial compositions between PA and FL fractions implies that most microorganisms are potentially generalists with PA and FL dual lifestyle for versatile metabolic flexibility. In addition, microbial distribution along the depth profile indicates a potential vertical connectivity between the surface-specific microbial lineages and those in the deep ocean, likely through microbial attachment to sinking particles.

Redescription and genetic characterization of Philometra lagocephali Moravec et Justine 2008 (Nematoda: Philometridae) from Lagocephalus lunaris (Bloch and Schneider) (Tetraodontiformes: Tetradontidae) in the South China Sea

2015 ◽  
Vol 60 (3) ◽  
Author(s):  
Shu-Xia Wang ◽  
Liang Li ◽  
Lu-Ping Zhang
Keyword(s):  
Body Size ◽  
South China Sea ◽  
South China ◽  
18S Rdna ◽  
Gravid Female ◽  
The South China Sea ◽  
The Body ◽  
Valid Species ◽  
The South ◽  
China Sea

AbstractPhilometra lagocephali Moravec et Justine, 2008 was redescribed using light and scanning electron microscopy based on the new material collected from the lunartail puffer Lagocephalus lunaris (Bloch et Schneider) (Tetraodontiformes: Tetradontidae) in the South China Sea. Our specimens are identical with the original description in the body size of gravid female, the width of cephalic and caudal end, the number and arrangement of cephalic papillae, the relative length of the oesophagus to body length, the size of ventriculus, the morphology of oesophageal bulb and posterior end, and the body size of larvae. In addition, specimens of P. lagocephali were also characterized using molecular methods by sequencing and analysing the small ribosomal DNA (18S rDNA) and mitochondrial cytochrome c coxidase subunit 1 (cox1) target regions. Phylogenetic analyses of genus Philometra base on 18S rDNA sequences was made using Mega 5.2. The results confirmed P. lagocephali is a valid species. It’s the first molecular study of this species. These new morphological and molecular data contributed to a more precise and rapid diagnosis of this hitherto poorly known philometrid nematode.

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