• Title/Summary/Keyword: Gastrotricha

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Description of Two New Thaumastodermatids (Gastrotricha, Macrodasyida) from Korea

  • Chang, Young-Cheon;Lee, Ji-Min;Claus Clausen
    • Animal cells and systems
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    • v.2 no.3
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    • pp.315-321
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    • 1998
  • Two new marine gastrotrichs of the family Thaumastodermatidae are described from South Korea. Tetranchyroderma gracilium n. sp. bears pestle organs, tetrancres, and two pairs of large dorsolateral tubes. It seems most closely related to T. massiliense Swedmark, T. heterotubulatum Hummon, Todaro and Tongiorgi, and T. boreale Clausen. Thaumastoderma copiophorum n. sp. has five pairs of dorsal cirrata, the overall picture of which differs clearly from that of all known species. In the presence of accessory cirrata, it relates to T. appendiculatum Chang, Lee and Clausen.

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Marine Gastrotrichs of the Genus Diplodasys (Macrodasyida: Thaumastodermatidae) from Korea

  • Lee, Ji-Min;Chang, Cheon-Young
    • Animal Systematics, Evolution and Diversity
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    • v.22 no.1
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    • pp.109-115
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    • 2006
  • Two marine gastrotrich species are reported from sublittoral sand bottom of Korea: Diplodasys ankeli Wilke, 1954 and D. meloriae Todaro, Balsamo and Tongiorgi, 1992. Both species are redescribed in detail, with the discussion on the intraspecific variability between Korean specimens and the original description or among Korean specimens. The genus Diplodasys is newly recorded from Korea as well as the Northwest Pacific.

Dendrodasys duplus, a New Gastrotrich Species (Macrodasyida: Dactylopodolidae) from South Korea

  • Lee, Jimin;Chang, Cheon Young;Kim, Dongsung
    • Animal Systematics, Evolution and Diversity
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    • v.30 no.2
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    • pp.103-107
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    • 2014
  • A new gastrotrich species of the genus Dendrodasys (Dactylopodolidae) is described on the basis of specimens collected from sublittoral fine sandy bottoms at Uljin, East Sea and at Gujwa, the northeastern coast of Jeju Island, South Korea. Dendrodasys duplus is characterized by a triangular head with lateral lobes extending outward, two pairs of pestle organs posterior to the lateral cephalic lobes, a pair of anterior adhesive tubes, the absence of dorsal, lateral and ventral adhesive tubes, large posterior adhesive tubes arising from the anterior third of the caudal peduncle, and paired testes of different lengths. The genus Dendrodasys is recorded for the first time in East Asia.

Crasiella clauseni, a New Gastrotrich Species (Macrodasyida, Planodasyidae) from Jeju Island, South Korea

  • Lee, Ji-Min;Chang, Cheon-Young
    • Animal Systematics, Evolution and Diversity
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    • v.28 no.1
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    • pp.42-47
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    • 2012
  • A new gastrotrich species of the genus Crasiella (Planodasyidae) is described from the sublittoral sandy bottom of Jeju Island, South Korea. The family Planodasyidae and the genus Crasiella are recorded for the first time from East Asia. Crasiella clauseni n. sp. differs from its congeneric species by the combination of characters: absence of cephalic sensory pits; unseparated arrangement of anterior tubes and ventrolateral tubes, comprising about 120 adhesive tubes along whole body length; 5-7 horizontal rows of adhesive tubes and a pair of TbV in the anterior part of pharyngeal region; bifid pedicles with 8-11 posterior adhesive tubes; and tube-shaped seminal receptacle and copulatory organ. This paper deals with description of the new species, and provides a key to the species of genus Crasiella.

Reconsideration on Two Acanthodasys Species (Gastrotricha: Macrodasyida: Thaumastodermatidae) from Korea, with Nomenclatural Note on Korean Marine Gastrotrichs

  • Lee, Jimin;Chang, Cheon Young
    • Animal Systematics, Evolution and Diversity
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    • v.33 no.1
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    • pp.17-25
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    • 2017
  • Two marine gastrotrich species of the genus Acanthodasys, A. ericinus Lee, 2012 and A. comtus Lee, 2012, are taxonomically reconsidered. Both of them were originally described based on the specimens from intertidal or sublittoral sandy bottom of the Yellow Sea and Jeju Island, South Korea, and included in a monographical publication of in 2012. However, the description of them was quite insufficient, and designations of type specimens were entirely lacking. In this study, we make a subsequent designation of type specimens for the two Acanthodasys species, and carry out a full redescription of them with additional remarks on their morphological micro-characteristics by scanning electronic microscopy. Some brief nomenclatural notes on Korean marine gastrotrichs are also provided.

Marine Chaetonotid Gastrotrichs of Genus Halichaetonotus(Chaetonotida: Chaetonotidae) from Korea (짠물새앙쥐벌레속 (카이토노티드목 : 카이토노티드과)의 해양 복모류)

  • Lee, Ji-Min;Chang, Cheon-Young
    • Animal Systematics, Evolution and Diversity
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    • v.20 no.1
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    • pp.55-62
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    • 2004
  • Two marine gastrotrich species belonging to the genus Halichaetonotus, which were collected from intertidal or sublittoral sand bottom of Korea, are reported: H. aculifer (Gerlach, 1953) and H. atlanticus Kisielewski, 1988. Both of them are newly reported from Korea as well as the Pacific. This paper deals with the systematic accounts on them with redescriptions and illustrations.

Pseudostomella Gastrotrichs (Macrodasyida, Thaumastodermatidae) from South Korea, with o Brief Review of the Genus

  • Lee, Ji-Min;Chang, Cheon-Young
    • Animal cells and systems
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    • v.6 no.3
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    • pp.207-213
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    • 2002
  • Two new marine gastrotrichs of the genus Pseudostomella, P. longifurca and P. koreana, are described from the shallow sublittoral sand bottoms of South Korea. Pseudostomella longifurca n. sp. is characterized by the cuticular armature with tetrancres, five dorsal papillae on the prebuccal apparatus, four dorsolateral adhesive tubes, and elongated pedicle. Pseudostomella koreana n. sp. is distinguished from its congeners by the small body, tetrancres, two pairs of dorsolateral adhesive tubes, and tube-shaped copulatory organ. A brief review of the genus is prepared, with the character comparison table for all congeners currently recognized, and a revised key to the species of Pseudostomella. This is the first record of the genus Pseudostomella from East Asia.

Two New Tetranchyroderma Gastrotrichs(Macrodasyida, Thaumastodermatidae) from South Korea

  • Chang, Cheon-Young;Lee, Ji-Min
    • Animal cells and systems
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    • v.5 no.3
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    • pp.187-194
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    • 2001
  • Two new gastrotrich species belonging to genus Tetranchyroderma are described on the basis of the specimens from intertidal or sublittoral sand bottoms of South Korea. Tetranchyroderma heterotentaculatum, n. sp. is clearly differentiated from its congeners by the character combination: the cuticular armature with pentancres, modified rod-like cephalic tentacles, and three pairs of dorsolateral adhesive tubes. Tetranchyroderma hoonsooi, n. sp. possesses tetrancres, paired lateral cephalic tentacles, and ventro-lateral adhesive tubes along whole lateral margin, while lacks dorsal adhesive tubes. Affinities with its congeners and variability within the species are discussed, with brief notes on morphological discrepancies between adults and juveniles.

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