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Kim J.G.,Chosun University | Jung T.W.,National Marine Biodiversity Institute of Korea | Yoon S.M.,Chosun University
Crustaceana | Year: 2016

Herein two new species of the genus Syngastes Monard, 1924 are described from South Korea, with detailed descriptions and illustrations. Both new copepods, Syngastes multicavus sp. nov. and S. pseudofoveatus sp. nov., have two inner setae on the first exopodal segment of P2 and P3. Syngastes multicavus sp. nov. most closely resembles S. gibbosus Bartsch, 1999 reported from Australia, as they both have a five-segmented antennule in the female. However, Syngastes multicavus sp. nov. has a rounded body outline instead of the gibbose outline observed in S. gibbosus. Syngastes pseudofoveatus sp. nov. resembles S. foveatus Bartsch, 1994 in almost all aspects. However, they differ clearly in the number of setae on the first exopodal segment of P2 and P3. We also provide a key to species of the genus Syngastes worldwide. The present study is the first record of the family Tegastidae in Korean waters. © Koninklijke Brill NV, Leiden, 2016. Source

Shim J.,Kongju National University | Shim E.,Kongju National University | Kim G.H.,Kongju National University | Han J.W.,National Marine Biodiversity Institute of Korea | Zuccarello G.C.,Victoria University of Wellington
Algae | Year: 2016

Biological response of cells to variable conditions should affect the expression level of certain genes. Quantification of these changes in target genes needs stable internal controls. Real-time quantitative polymerase chain reaction (PCR) has traditionally used reference or ‘housekeeping’ genes, that are considered to maintain equal expression in different conditions, to evaluate changes in target genes between samples and experimental conditions. Recent studies showed that some housekeeping genes may vary considerably in certain biological samples. This has not been evaluated in red algae. In order to identify the optimal internal controls for real-time PCR, we studied the expression of eleven commonly used housekeeping genes; elongation factor 1-alpha, glyceraldehyde-3-phosphate dehydrogenase, β-actin, polyubiquitin, 30S ribosomal gene, 60S ribosomal gene, beta-tubulin, alpha-tubulin, translation initiation factor, ubiquitin-conjugating enzyme, and isocitrate dehydrogenase in different life-history stages of Bostrychia moritziana. Our results suggest that glyceraldehyde- 3-phosphate dehydrogenase (GAPDH) and 30S ribosomal gene, have the most stable gene expression levels between the different life history stages (male, female, carposporophyte, and tetrasporophyte), while the other genes are not satisfactory as internal controls. These results suggest that the combinations of GAPDH and 30S would be useful as internal controls to assess expression level changes in genes that may control different physiological processes in this organism or that may change in different life history stages. These results may also be useful in other red algal systems. © 2016 The Korean Society of Phycology. Source

Baek K.,Chung - Ang University | Baek K.,National Marine Biodiversity Institute of Korea | Jeon C.O.,Chung - Ang University
International Journal of Systematic and Evolutionary Microbiology | Year: 2015

A Gram-stain-negative, strictly aerobic, non-pigmented, motile bacterium with a single polar flagellum, designated H29T, was isolated from coastal sediment of Jeju Island, South Korea. Cells were non-spore-forming rods showing catalase- and oxidase-positive reactions. Growth of strain H29T was observed at 10–40 8C (optimum, 20–25 8C) and pH 6.0–9.0 (optimum, pH 7.0–8.0), and in the presence of 1–4% (w/v) NaCl (optimum, 2–3 %). Strain H29T contained C16:0, iso-C15:0 3-OH and summed feature 3 (comprising C16:1ω7c/C16:1ω6c) as the major fatty acids and ubiquinone-8 (Q-8) as the sole isoprenoid quinone. Phosphatidylethanolamine and phosphatidylglycerol were identified as the major polar lipids. The G+C content of the genomic DNA was 46.5 mol%. Phylogenetic analyses based on 16S rRNA gene sequences showed that strain H29T formed a phyletic lineage with Rheinheimera hassiensis E48T within the genus Rheinheimera of the family Chromatiaceae. Strain H29T was most closely related to Rheinheimera pacifica KMM 1406T, Rheinheimera muenzenbergensis E49T, Rheinheimera hassiensis E48T and Rheinheimera baltica OSBAC1T with 97.8 %, 97.6 %, 97.4% and 97.2% 16S rRNA gene sequence similarities, respectively. However, DNA–DNA hybridization values of strain H29T with type strains of these species were lower than 70 %. On the basis of the phenotypic, chemotaxonomic and molecular properties, strain H29T represents a novel species of the genus Rheinheimera, for which the name Rheinheimera aestuarii sp. nov. is proposed. The type strain is H29T (5KACC 18251T5JCM 30404T). © 2015 IUMS. Source

Kim J.G.,Chosun University | Jung T.W.,National Marine Biodiversity Institute of Korea | Yoon S.M.,Chosun University
Zootaxa | Year: 2016

Zosime destituta sp. nov. is described from shallow subtidal habitats in the southern sea of Korea. The new species is sim-ilar to Z. valida Sars, 1919, but differs from it primarily by the lack of an inner seta on the third endopodal segment of the fourth swimming leg. Based on morphological comparison of female character states, the genus Zosime can be subdivided into three provisional groups, anneae-, incrassata-, and typica-group. These groups are distinguished from each other by differences in the antennule, antennary exopod, mandibular rami, armature of swimming legs, fifth leg, and caudal rami. In addition, Zosime incrassata bathybia Bodin, 1968 is removed from its synonymy with Z. incrassata Sars, 1910 and upgraded to species level. An amended key to all known species of Zosime Boeck, 1873 is given, along with a table of all major characters. The present study is the first report of the family Zosimeidae Seifried, 2003 from Korean waters. Source

Jung T.W.,National Marine Biodiversity Institute of Korea | Yoon S.M.,Chosun University
Journal of Natural History | Year: 2015

The family Nuuanuidae Lowry and Myers, 2013 is first reported from Korean waters by the discovery of Nuuanu paracyclodactyla sp. nov. and Parvipalpus gen. nov., erected with the description of Parvipalpus holocaudatus sp. nov., along with their detailed descriptions and illustrations. The monotypic genus, Parvipalpus gen. nov., is characterized by the bi-articulate mandibular palp, the uni-articulate outer ramus of uropod 3, and no cleft telson. The new species, Nuuanu paracyclodactyla sp. nov., is very similar to Gammarella cyclodactyla (Hirayama, 1978) in the peculiar shape of propodus and dactylus on gnathopod 2 in mature males, but the former is distinguished readily by the absence of dorsal keels on the pleons and urosomite 1. New keys to genera of this family and to species of the genus Nuuanu are provided. © 2015 The Author(s). Published by Taylor & Francis. Source

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