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Su-Yuan Seo,Boon-Jo Rho 한국동물분류학회 2015 Animal Systematics, Evolution and Diversity Vol.31 No.1
Colonial ascidians, Clavelina elegans (Oka, 1927) and Clavelina miniata Watanabe & Tokioka, 1973 are reported for the first time in Korean waters. As a result of this study, three species of the genus Clavelina are now recorded in Korean fauna. Clavelina elegans and C. miniata have been reported only from Japan. We expanded the distribution range of these species to Korea. The specimens of C. elegans and C. miniata were collected from the subtidal zone of Beomseom and Chagwido in Jeju-do by SCUBA diving. Detailed descriptions, illustrations and photographs of these species are provided in this paper.
A First Record of the Genus Eusynstyela (Ascidiacea: Stolidobranchia: Styelidae) from Korea
Su-Yuan Seo,Boon-Jo Rho 한국동물분류학회 2014 Animal Systematics, Evolution and Diversity Vol.30 No.4
Colonial ascidian, Eusynstyela monotestis (Tokioka, 1953), is newly reported from Korean waters. The specimens of E. monotestis examined in this study were collected at subtidal zone of Beomseom, Munseom, Seopseom and Chagwido in Jeju-do by SCUBA diving. The genus Eusynstyela Michaelsen, 1904 is also new to Korean waters and it is distinct from other genera by having branchial sac with folds, longitudinal stigmata, hermaphrodite gonads on both sides, 1-2 male follicles in each gonad and body wall with endocarps. Eusynstyela monotestis is distinct from other species by having gonad with only single male follicle. In this paper, detailed descriptions and photographs of Eusynstyela monotestis (Tokioka, 1953) are provided.
Su Yuan Seo 한국동물분류학회 2021 Animal Systematics, Evolution and Diversity Vol.37 No.4
The genus Rhopalaea Philippi, 1843 is firstly recorded as a Korean fauna. It is distinct from other genera of Diazonidae in order Aplousobranchia by having solitary individuals or at most two embedded in a common test. Solitary ascidian, Rhopalaea crassa (Herdman, 1880), is also newly reported from Korean waters. Rhopalaea crassa has a club-shaped body, developed thorax, a vertical gut loop and yellow patches in transparent test. Specimens of R. crassa examined in this study were collected from the subtidal zone of Jeju-do Island by scuba diving. In this paper, detailed descriptions and photographs of specimens and living forms of R. crassa are provided.
First Record of the Genus and Species, Thetys vagina (Thaliacea: Salpida: Salpidae) in Korea
Su Yuan Seo,Sun Woo Kim,Jung Hye Won 한국동물분류학회 2020 Animal Systematics, Evolution and Diversity Vol.36 No.3
Pelagic tunicate, Thetys vagina Tilesius, 1802, is newly reported from Korean waters. The genus Thetys Tilesius, 1802 is also first recorded as Korean fauna. Thetys vagina is the only valid species in the genus Thetys. It is distinct from other genera by having at least 16 body muscles widely interrupted, no anterior proboscis, bent alimentary canal in the solitary oozooid, and five narrow body muscles, no ventral peduncle, an almost compact loop alimentary canal in the aggregate blastozooids. The specimens of T. vagina examined in this study were collected at the subtidal zone of Ulleung-do Island by scuba diving. In this paper, the detailed descriptions and photographs of both the solitary and aggregate living forms of T. vagina are provided.
Two New Records of Eudistoma (Aplousobranchia: Polycitoridae) from Korea
Su Yuan Seo The Korean Society of Systematic Zoology 2024 Animal Systematics, Evolution and Diversity Vol.40 No.1
Two colonial ascidians, Eudistoma glaucum and Eudistoma purpureum, are reported for the first time in Korean waters through taxonomic study on ascidians collected from a subtidal zone of Jejudo Island. Eudistoma glaucum is distinguished by opaque green color of colony in living, massive colony with large corona, smooth surface of corona, sparse sand only at the peduncle, zooids in circle, about 8-10 stigmata of 3 stigmata rows and test process. Eudistoma purpureum is distinguished by brilliant, opaque, purple color of colony in living, less lobed colony form, smooth shiny surface, sparse sand only at the basal test, absence of symbionts, zooids in circle, no distinct bulging sphincter in siphon, long atrial siphon and about 20 stigmata of 3 stigmata rows. As a result of this study, four species of the genus Eudistoma are now recorded in Korean fauna.
Seo, Su-Yuan,Rho, Boon-Jo The Korean Society of Systematic Zoology 2015 Animal Systematics, Evolution and Diversity Vol.31 No.1
Colonial ascidians, Clavelina elegans (Oka, 1927) and Clavelina miniata Watanabe & Tokioka, 1973 are reported for the first time in Korean waters. As a result of this study, three species of the genus Clavelina are now recorded in Korean fauna. Clavelina elegans and C. miniata have been reported only from Japan. We expanded the distribution range of these species to Korea. The specimens of C. elegans and C. miniata were collected from the subtidal zone of Beomseom and Chagwido in Jeju-do by SCUBA diving. Detailed descriptions, illustrations and photographs of these species are provided in this paper.
A First Record of the Genus Eusynstyela (Ascidiacea: Stolidobranchia: Styelidae) from Korea
Seo, Su-Yuan,Rho, Boon-Jo The Korean Society of Systematic Zoology 2014 Animal Systematics, Evolution and Diversity Vol.30 No.4
Colonial ascidian, Eusynstyela monotestis (Tokioka, 1953), is newly reported from Korean waters. The specimens of E. monotestis examined in this study were collected at subtidal zone of Beomseom, Munseom, Seopseom and Chagwido in Jeju-do by SCUBA diving. The genus Eusynstyela Michaelsen, 1904 is also new to Korean waters and it is distinct from other genera by having branchial sac with folds, longitudinal stigmata, hermaphrodite gonads on both sides, 1-2 male follicles in each gonad and body wall with endocarps. Eusynstyela monotestis is distinct from other species by having gonad with only single male follicle. In this paper, detailed descriptions and photographs of Eusynstyela monotestis (Tokioka, 1953) are provided.
First Record of Synoicum clavatum (Ascidiacea: Aplousobranchia: Polyclinidae) from Korea
Seo, Su-Yuan,Rho, Boon-Jo The Korean Society of Systematic Zoology 2016 Animal Systematics, Evolution and Diversity Vol.32 No.1
A colonial ascidian, Synoicum clavatum has previously been reported from Japan. Here, we provide detailed descriptions and illustrations of S. clavatum as the first record in Korea. Synoicum clavatum is characterized by club-shaped colonies with oval head and elongate stalk, circular cloacal systems, a branchial sac with 14-16 stigmata rows of 10-17 stigmata per row and a stomach with smooth surface. The specimens of S. clavatum were collected in the subtidal zone (15-25 m depth) at Beomseom and Mumseom in Jeju-do while SCUBA diving from 2000 to 2014.
Distribution of Marine Invertebrates of Bigeum-do Island, Sinan-gun, Jeollanam-do, Korea
Kang, Dong-Won,Seo, Su-Yuan,Won, Jung-Hye,Kang, Ji-Soon,Kim, Won-Rok,Paek, Woon-Kee,Kim, Do-Hong National Science Museum of Korea 2012 Journal of Korean nature Vol.5 No.1
Joint study with the Union of Biodiversity Organizations on the marine invertebrates of Bigeumdo (Is.), Sinan-gun, Jeollanam-do was conducted over 3 sessions between March and September of 2011. Compared to the 2nd National Natural Environment Survey of 2000 (Ministry of Environment), 28 new species, including 10 mollusk species, were additionally observed, for a total of 71 marine invertebrates species belonging to 43 families. A list of 117 species belonging to 58 families, which includes the 71 marine invertebrates species observed during the study and the 88 species reported in the 2nd National Natural Environment Survey, was used to create an inventory of marine invertebrates studied in Bigeumdo (Is.), Sinan-gun, Jeollanam-do.