• Title, Summary, Keyword: Canthocamptus

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Taxonomy on Freshwater Canthocamptid Harpacticoids (Copepoda) from South Korea - 1. Genus Canthocamptus (한국 담수산 딱정장수노벌레과 갈고리노벌레류의 분류 - 1. 딱정장수노벌레( Canthocamptus)속)

  • Cheon Young Chang;Ji Min Lee
    • Animal Systematics, Evolution and Diversity
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    • v.19 no.1
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    • pp.149-159
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    • 2003
  • A taxonomic study on the freshwater harpacticoids of the genus Canthocamptus has been accomplished as one of the serial researches on the family Canthocarnptidae in South Korea. As a result of it, a total of seven species of the genus are listed, two of which are new to Korean fauna: C. kitaurensis Kikuchi and C. macrosetifer Ishida. Additional materials of five species belonging to Canthocamptus mirabilis species group are recorded. A key to the seven species of the genus Canthocamptus known from Korea is prepared.

Redescription of Canthocamptus mirabilis Sterba (Copepoda, Harpacticoida), Based on the Topotypic Material from China (중국의 모식산지에서 채집한 갈고리노벌레류 Canthocamptus mirabilis Sterba의 재기재)

  • Chang, Cheon-Young
    • Animal Systematics, Evolution and Diversity
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    • v.17 no.1
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    • pp.1-11
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    • 2001
  • Conthocamptus mirabilis Sterba is redescribed on the basis of the material newly collected from the type locality near Bekijing, China, with an evaluation of the variability of several characters. C. mirabilis possesses the plesiomorphic characters of the round and narrow hyaline membrane and the unmodified outer terminal furcal setae, while it also bears the apomorphic ones of the male-type caudal rami in females and the modified outer terminal setae of male leg 4 exopod. the peculiar dorsal keel ornamented with spinule array on the female's caudal rami is the most significant feature differentiating this species from its relatives of the mirabilis group, which turned out to be a species group of closely related and largely allopatric or parapatric species. Affinities with the allies of the species group are discussed, and the morphological discrepancies differentiating the Japanese population are enumerated.

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Redescription of Canthocamptus morimotoi Miura, a Stygobiontic Harpacticoid Species from Korea, with a Brief Review on C. mirabilis Group

  • Cheon Young Chang
    • Animal cells and systems
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    • v.2 no.4
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    • pp.427-434
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    • 1998
  • Canthocamptus morimotoi Miura, a cave-dwelling harpacticoid species belonging to C. mirabilis species group, is fully redescribed and illustrated on the basis of the material newly collected from the type locality, Simpigul Cave, South Korea. C. morimotoi is the only genuine subterranean species in the C, mirabilis group, and claimed to be a relict species restricted to its type locality. The sexually isomorphic ornamentation of the outer terminal seta on the distal exopodal segment of male leg 4 and the well-developed spines on the disteromedial corner of anal somite are the most significant features differentiating this species from ther members of the mirabilis-group.

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Taxonomy on Canthocamptus semicirculus and C. coreensis n. sp.(Harpacticoida, Canthocarnptidae), with a Key to the C. mirabilis Species Group from South Korea (딱정 장수노벌레속(갈고리노벌레목, 딱정장수노벌레과) mirabilis 종군에 속하는 1신종 1기록종의 분류학적 연구)

  • Chang, Cheon-Young
    • Animal Systematics, Evolution and Diversity
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    • v.18 no.2
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    • pp.233-244
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    • 2002
  • As one of the serial studies on the taxonomy of Conthocamptus mirabilis species group in South Korea, C. semicirculus Kikuchi, widely distributed in the southern part of the Far East, and C. coreensis n. sp. from the middle west of South Korea are recorded. Intraspecific variability of some important characters like outer caudal setae and the spinous process of male leg 3 exopod was examined in Korean population of C. semicirculus. Canthocamptus coreensis n. sp. possesses the plesiomorphic characters of the round and narrow hyaline membrane of anal operculum and lacking the sexual reverse transformation in female caudal rami, while it also evolves the apomorphic ones of the modified outer apical setae of male leg 4 exopod and the spinous process of male leg 3 exopod. A key to the five species of the species group known from Korea is prepared.

진도의 담수산 물벼룩류와 요각류의 출현특성에 관한 생태학적 연구

  • Yoon, Seong-Myeong;Chang, Cheon-Young;Kim, Won
    • Animal Systematics, Evolution and Diversity
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    • v.11 no.1
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    • pp.39-64
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    • 1995
  • A faunistic and ecological study on the occurrence of freshwater cladocerans and copepods was accomplished from Chindo, South Korea. Collections were made from total 35 stations, comprising the various freshwater habitats like reservoirs, streams, swamps, bogs, ricefields, ditch, pond, and spring during the periods of July 23-25, and November 1-3 in 1994. Twenty seven cladoceran species of 17 genera of 6 families in 2 orders, and 28 copepod species of 21 genera of 6 families in 3 orders were collected during this research period, of which Daphnia obtusa Kurz and Elaphoidella bidens (Schmeil) are newly recorded from Korea. In reservoirs, Diaphanosoma sp. and Thermocyclops taihokuensis were dominant in July, and then succeeded by Bosmina longirostris and Cyclops vicinus vicinus in November. Thermocyclops crassus co-occurred with 7: taihokuensis at both seasons, was frequent in November after T. taihokuensis precipitately decreased. In other stagnant waters, 7: taihokuensis and Moina weismanni were dominant at ponds in July and in November, respectively. At ricefields in July Moina macrocopa and T. taihokuensis were dominant, but in November M. macrocopa and Paracyclops fimbriatus were. At streams, cladocerans were relatively rare, but became more rich in November. The representative cladoceran species were Bosmina longirostris as a plankton, and Chydorus sphaericus as a epibenthic species. Concerning copepods, nearly all the stations of streams except a few ones adjacent to seashore showed the similiar species constitutions, of which E. serrulatus and M, pehpeiensis were most frequent and abundant. At a mountain streamlet and a spring, the occurrence of Alona sp., Attheyella byblis Chang and Kim, 1992 and A. tetraspinosa Chang, 1993 is quite interesting and deserved much attention in the taxonomical point of view. Seventeen major cladocerans and copepods from lentic habitats and 13 major cladocerans and copepods from lotic habitatats were clustered using average taxonomic distance and UPGMA to infer the co-occurrence relations among species. As for lentic habitats, two large phena were appeared at first. The one phenon consisted of Diaphanosoma sp. and T taihokuensis, and showed its predominancy over the various habitats and its dominancy was rapidly decreased in November. The other phenon frequently occurred rather in November, and subdivided into three subgroups. On the other hand, as for lotic habitats, 13 species were also grouped into 2 large phena. The first one comprised 4 species, which were dominant and highly frequent at nearly all the lotic habitats, and subdivided into three subgroups according to their seasonal fluctuation types. The second one was also subdivided into three phena, the first of which comprised only one species, Microcyclops varicans, and occurred at most of the stations along stream with steadiness through the research period; the second phenon, Chydorus sphaericus, occurred much frequently in November; the last phenon included a few heterogenous subgroups.

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