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윤양호,OHTSUKA, SUSUMU,YOON, YANG HO,ENDO, YUKIHIRO 한국해양학회 1992 韓國海洋學會誌 Vol.27 No.2
한국남부의 수역에서 지금 까지는 중국남부에서만 출현보고가 있는 calanoid 요강 류 Tortanus dextrilobatus Chen and Jang, 1995가 발견되었기에 여기에 한국산 미기 록종으로 기재한다. 아울러 본 종의 속하는 아속의 표징을 기술함과 동시에 아속종들 의 분포에 대한 봉물지리학적인 고찰을 실시하였다. The calanoid copepod Tortanus (Eutortanus) dextrilobatus Chen and Zhang, 1965, which had been recorded only from South China, is redescribed from brackish waters in South Korea. The diagnosis of the little known subgenus Eutortanus is presented hear. The zoogeography of five species of Eutortanus is also discussed.
Hiroko Okawachi,Susumu Ohtsuka,Norshida Binti Ismail,BALUALAGARVENMATHIMARAN,Kazuo Ogawa 한국해양과학기술원 2012 Ocean science journal Vol.47 No.3
The seasonal occurrence and microhabitat of the monogenean Udonella fugu that hyperparasitizes exclusively on adults of the caligid copepod Pseudocaligus fugu that infects the skin of the grass puffer Takifugu niphobles were investigated in the Seto Inland Sea, western Japan from November 2004 to December 2006. The udonellids occurred and bred mostly during the occurrence of P. fugu on the fish host. The average prevalence and intensity of U. fugu on P. fugu during the whole investigation were 29% and 3.6, respectively. The main attachment sites of U. fugu were the posterior side of leg 3 and the dorsal marginal side of the cephalothorax for feeding and copulation, while eggs were predominantly located on the ventral side of the urosome to avoid detachment. More attention should be paid to the ecology of U. fugu, due to recent high prevalence of P. fugu on cultured tiger puffer in western Japan.
Takeo Horiguchi,Ai Harada,Susumu Ohtsuka,Ho Youn Soh,Yang Ho Yoon 한국조류학회I 2004 ALGAE Vol.19 No.3
An ectoparasitic dinoflagellate infesting planktonic chaetognath, Sagitta crassa Tokioka was found, for the first time, from Korean coasts. In order to identify the species, we investigated detailed morphology of the dinoflagellate using Nomarski interferance optics as well as epifluorescent microscopes. The parasitic dinoflagellate consists of an oval to rod-shaped cell with a peduncle, by which the organism attaches to the host. The cell is covered with polygonal thecal plates. The nucleus displays two different shapes according to cell cycle stages: in young trophont the nucleus is elongated and shows typical dinoflagellate nucleus (dinokaryon), while in matured trophont, the nucleus is dome-shaped and non-dinokaryotic. The peduncle is variable in length and is ornamented with the longitudinal striations. All these characteristics point to identity that the ectoparasitic dinoflagellate infecting Sagitta crassa in Korean coasts is Oodinium inlandicum Horiguchi et Ohtsuka, originally described from the Seto Inland Sea of Japan. Relationship between prevalence and host sizes differed from those in Japan.
Horiguchi, Takeo,Harada, Ai,Ohtsuka, Susumu,Soh, Ho-Young,Yoon, Yang-Ho The Korean Society of Phycology 2004 ALGAE Vol.19 No.3
An ectoparasitic din flagellate infesting plank tonic chaetognath, Sagitta crassa Tokioka was found, for the first time, from Korean coasts. In order to identify the species, we investigated detailed morphology of the din flagellate using Nomarski interference optics as well as epifluorescent microscopes. The parasitic din flagellate consists of an oval to rod-shaped cell with a peduncle, by which the organism attaches to the host. The cell is covered with polygonal thecal plates. The nucleus displays two different shapes according to cell cycle stages: in young trophont the nucleus is elongated and shows typical din flagellate nucleus (dinokaryon), while in matured trophont, the nucleus is dome-shaped and non-dinokaryotic. The peduncle is variable in length and is ornamented with the longitudinal striations. All these characteristics point to identity that the ectoparasitic din flagellate infecting Sagitta crassa in Korean coasts is Oodinium inlandicum Horiguchi et Ohtsuka, originally described from the Seto Inland Sea of Japan. Relationship between prevalence and host sizes differed from those in Japan.
Suh, Hae Lip,Susumu Ohtsuka,Soh, Ho Young 한국수산학회 1999 Fisheries and Aquatic Sciences Vol.2 No.2
Haloptilus caribbeanensis Park, 1970 (Copepoda, Calanoida, Augaptilidae) is redescribed in detail on the basis of an adult female collected from Suruga Bay, Japan. This is the first record of the species from the Indo-Pacific region. Morphology of the Pacific specimen agrees well with that of the Caribbean Sea and Gulf of Mexico specimens, except for the numbers of mandibular teeth. The former has five teeth and the latter six teeth on mandible. The segmentation and segmental aesthetasc numbers of female antennules of H. caribbeanensis are compared with those of five species of Haloptilus (H. angusticeps, H. fons, H. longicornis, H. ornatus and H. spiniceps). These characters show morphological differentiation at the species level. H. caribbeanensis has no aesthetasc on the proximal segments II, IV, and VI of the female antennules.
Phylogenetic Relationships of the Family Metridinidae(Copepoda : Calanoida)
Suh, Hae Lip,Ryu, Ho Young,Susumu Ohtsuka 한국수산학회 1999 Fisheries and Aquatic Sciences Vol.2 No.2
Several differences are revealed in the segmentation and setation of the antennule, maxillule, maxilliped and fifth legs between three genera of the family Metridinidae, Metridia, Pleuromamma, and Gaussia. The phylogenetic relationships are cladistically analyzed on the basis of 10 morphological characters. The cladogram shows that Gaussia and Pleuromamma form a sister group, with Metridia which is the first branch to diverge within the family. The presence of quadritheks on the male antennules of Metridia and Pleuromamma seems to be an important synapomorphy. The loss of quadritheks an Gaussia represents likely evidence of a character reversal into the ancestral condition.