• 제목/요약/키워드: Six species

검색결과 1,914건 처리시간 0.027초

A review on the Fauna of the Superorder Batoidea (Elasmobranchii, Pisces) in the East Asia

  • Jeong, Choong-Hoon;Yoo, Jae-Myung;Huh, Hyung-Tak
    • 한국어업기술학회:학술대회논문집
    • /
    • 한국어업기술학회 2000년도 춘계수산관련학회 공동학술대회발표요지집
    • /
    • pp.465-466
    • /
    • 2000
  • The living cartilaginous fishes, class Chondrichthyes, may comprise about 900 described species, and include approximately 170 genera and 50 families (Compagno, 1991). At present the Chondrichthyes consists of two subclasses, the Holocephali and the Elasmobranchii. The dominant subclass Elasmobranchii includes modem sharks and rays, the former is more diverse than the latter in higher taxa but have fewer species. The superorder Batoidea, batoids or rays, is speciose with about 500 species in six orders, fourteen families and about 60 genera. (omitted)

  • PDF

Brief morphological description of stichotrichid ciliates (Ciliophora: Stichotrichia) from Korea

  • Kim, Kang-San;Min, Gi-Sik
    • Journal of Species Research
    • /
    • 제7권4호
    • /
    • pp.323-332
    • /
    • 2018
  • Ten stichotrichid ciliates were identified from six environmental samples, consisting of one freshwater, two seawater, and three soil samples. Morphological assessments were performed based on observations of both living and stained specimens. These species were assigned to two orders, three families, and nine genera, and we provide photographs and brief descriptions and remarks for each species: Parabirojimia similis Hu et al., 2002, Arcuseries warreni (Song & Wilbert, 1997) Huang et al., 2014, Gonostomum lajacola Foissner, 2016, Paragonostomoides xianicum Wang et al., 2017, Australocirrus oscitans Blatterer & Foissner, 1988, Monomicrocaryon crassicirratum Foissner, 2016, Monomicrocaryon euglenivorum fimbricirratum Foissner, 2016, Notohymena rubescens Blatterer & Foissner, 1988, Sterkiella multicirrata Li et al., 2018, Stylonychia ammermanni ammermanni Gupta et al., 2001.

한국산 애응애과 응애의 분류 및 동위효소에 관한 연구 (A Study on the Taxonomy and lsozymes of False Spider Mites (Acarina: Temwpalpidae) from Korea)

  • 이정상
    • 한국동물학회지
    • /
    • 제31권2호
    • /
    • pp.147-155
    • /
    • 1988
  • 1986년 12월부터 87년 11월까지 채집된 애응애과 응애를 분류학적으로 정리한 바 Brevipalpus속의 B.californicus와 B.ovovatus 2종과 다음의 한국4미기록종을 얻었다: Aegyptobia nothus Pritchard and Baker,Pentomerismus taxi Hailer, P. oregonensis McGregor,Brevipalpus lewisi McGregor. 따라서, 한국산 애응애과 응애는 Tenuipalpus속의 T.zhizhilashiliae(감나무애응애)를 포함하여 4속 7종이 보고되는 셈이다. 또한 P. oregonensis,B.californicus,B.ovovatus 및 B.lewisi에 대하여 polyacrylamide slab gel electrophoresis로 esterase와 alkaline phosphatase pattern을 조사한 바 esterase는 band수와 이동도에서 종과 속간에 뚜렷한 차이를 보였다.

  • PDF

Redescription of the Free-living Marine Nematode Species, Draconema japonicum Kito, 1976 (Nematoda: Draconematidae), by Scanning Electron Microscopy

  • Rho, Hyun-Soo;Kim, Won
    • Animal cells and systems
    • /
    • 제8권4호
    • /
    • pp.235-245
    • /
    • 2004
  • Numerous specimens of adults and juveniles of Draconema japonicum Kito, 1976 have been found in intertidal and subtidal sediments and various algae around coast of South Korea. Draconema japonicum is recognized by the following characteristics: having an elongated loop-shaped amphideal fovea in male and horseshoe-shaped amphideal fovea in female, two pairs of uniformly tapered sublateral anal setae and two pairs of unevenly tapered subventral anal setae in male, eight to ten pairs in male and 13 to 15 pairs in female of posterior sublateral adhesion tubes, and five to six pairs of somatic setae on non-striated tail region. Scanning electron photomicrographs of the species are presented with a detailed morphological description and a key to the species of the genus Draconema Cobb, 1913. This is the first discovery of D. japonicum outside the Japanese waters.

한국산 피나무속 식물의 개화와정과 수분기작 (Flowering Process and Pollination Mechanism of Genus Tilia in Korea)

  • Chung, Yung Ho
    • Journal of Plant Biology
    • /
    • 제27권3호
    • /
    • pp.107-127
    • /
    • 1984
  • An anthecological study of Tilia in Korea was undertaken for six native and one introduced species. Flowers are protoandrous with anther and stigma opening during the day-time in section(sect) Anastraea and the night-time in sect Astrophilyra. Nectar production was coincided with anther and stigma opening. It is revealed that the primary role of floral bracts was attracting pollinators especially in sect Astrophilyra. The peak of stamen and stigma function, and the production of nectar and odor were closely related with pollinator attraction. Forthy-three species of insects in 30 families were identified for the pollination studies; bees were the most commonly observed visitors in sect Anastraea, while moths were the primary visitors in sect Astrophilyra. Pollination study indicate that it is section specific. But within a section, pollination is not species specific thus interspecific hybridization occurs.

  • PDF

한국에 자생 또는 재배되는 Paeonia속의 세포학적 연구 재배균약 Paeonia albiflora의 핵형 (Cytological Studies of the Paeonia Species Grown Wild or Cultivated in Korea I Karyotypes of cultivated P. albiflora varieties)

  • 한창열
    • Journal of Plant Biology
    • /
    • 제19권2호
    • /
    • pp.33-36
    • /
    • 1976
  • Present work was attempted to investigate the karyotype, the reciprocal translocation of chromosomes and the geographical distribution of three Paeonia species grown wild in Korea with the aim of elucidating the taxonomical affinities of the species. Prior to conducting these works, it was required to clarify the karyotypes of the cultivated varieties of P. albiflora which has been grown since long time ago in this coundtry for medicinal value. Present report is part of the series of karyotype studies now being extensively conducted using varieties (or lines) of P. albiflora collected across the country. Arm ratio, number of trabant, kind of trabant chromosomes and karyotype formula are different among the six cultivated varieties. Excepting one, five varieties used had invariably trabants on D and E chromosomes while no trabant was found in C chromosome.

  • PDF

Tailoring Molecular Precursors for Multicomponent Oxides

  • Hubert-Pfalzgraf, Liliane G.
    • The Korean Journal of Ceramics
    • /
    • 제6권4호
    • /
    • pp.370-379
    • /
    • 2000
  • Simple ways to build up mixed-metal molecules which can act as potential single-source precursors to multimetallic oxides are reviewed. Emphasis is given to Lewis acid-base reactions between metal alkoxides M(OR)/sub n/, and between metal alkoxides and more accessible oxide precursors, carboxylates M(O₂CR)/sub n/ and β-diketonates M(β-dik)/sub n/. Characterization of the precursors is achieved in the solid state (single crystal X-ray diffraction, FT-IR) and by multinuclear NMR in solution. The reactions proceed toward the formation of aggregates in which the different metals display their usual coordinations numbers, often six for transition metals, as shown. Strategies for fixing the stoichiometry between the metals are developed. The reactivity of the MM species (dissociation, effects of chemical modifiers, of other metallic species, hydrolytic or non-hydrolytic condensation, etc.) will be indicated. Transformations into oxides are illustrated on precursors for titanates or niobates.

  • PDF

침·활엽수재의 Microwave 건조곡선예측 (Prediction of Microwave Drying Curves for Various Hardwoods and Softwoods)

  • 강호양
    • Journal of the Korean Wood Science and Technology
    • /
    • 제26권4호
    • /
    • pp.34-42
    • /
    • 1998
  • Three hardwood (ash, alder and black locust) and three softwood (Japanese red pine, radiata pine and Western hemlock) specimens were dried in microwave(MlW) oven and their drying rates were obtained. Their specific permeabilities were also measured by using a modified liquid permeability measuring device. The correlation between the M/W drying rates and permeabilities of six species were statistically analyzed. It was revealed that within a species there is a logarithmic relationship between the M/W drying rates and average moisture contents and that among species there is a linear relationship between the M/W maximum drying rates and the average specific permeabilities. A exception was Western hemlock, which was of low permeability and of high drying rate. A Me-time equation, which showed a good agreement with the actual data, was derived. Thus using this equation the moisture contents of wood and the drying end points of M/W drying could be predicted. Infrared images of the thermal distribution in wood were illustrated.

  • PDF

한국산 산호충류의 계통분류학적 연구 11. 돌산호류의 자포 (A Systematic Study on the Korean Anthozoa 11. Cnidae of Scleractinia)

  • 송준임
    • Animal Systematics, Evolution and Diversity
    • /
    • nspc2호
    • /
    • pp.25-36
    • /
    • 1988
  • 한국 해역에서 알려진 돌산호류 6과 17종 중 대표적인 5과 7종을 택하여 자포의 분포를 조사한 결과 6형의 자포를 지니고 있었으며 이들은 다음과 같다. atrichous isorhizas, basitrichous isorhizas, holotrichous isorhizas, microbasic p-mastigophores, microbasic b-mastigophores 및 spirocysts.

  • PDF

Siphonostomatoid Copepods (Crustacea) Associated with Sponges from the Philippines and Vietnam

  • Lee, Jimin;Kim, Il-Hoi
    • Animal Systematics, Evolution and Diversity
    • /
    • 제33권2호
    • /
    • pp.73-99
    • /
    • 2017
  • Six new species of siphonostomatoid copepods are described from sponges collected in the Philippines and Vietnam. Two new genera of Asterocheridae, Andapontius and Holobinus, are proposed. The new species are Andapontius granulatus n. gen. n. sp., Holobinus angustus n. gen. n. sp. and Dermatomyzon boxshalli n. sp. in the family Asterocheridae and Entomopsyllus brevicaudatus n. sp., Paralepeopsyllus leei n. sp. and P. dambayensis n. sp. in the family Entomolepididae. Doropontius denticornis Thompson and Scott, 1903, is redescribed for the first time since its original record.