The identity of y-larvae (Crustacea)

y-幼虫（甲壳纲）的身份

• 批准号: 62540567
• 负责人: ITO Tatsunori
• 金额: $ 1.34万
• 依托单位: Kyoto University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1987
• 资助国家: 日本
• 起止时间: 1987 至 1989
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-62540567/
• 关键词: Crustacea; Y-larvae; Facetotecta; Animal taxonomy; 分類; 動物; 海洋生物; プランクトン

In order to discover the adult of y-larvae, thecostracan crustaceans associated with various invertebrates from Tanabe Bay were examined. A total of 4 genera and 4 species of ascothoracidans as well as many cirripedians were discovered, but none of them appeared to produce y-larvae. Naupliar larvae of a new ascothoracidan species were individually raised to the ascothoracid stage, and a number of new facts were uncovered.The paraocular process and postocular filamentary tuft were studied with SEM. The former is part of the organ of Bellonci, the latter is part of a prominent gland. The postocular filamentary tuft reduces after the metamorphosis to the cypris y stage.In many species, the nauplius y larvae were successfully raised to the cypris, y stage by individual culture. Development of cephalic shield plates through their naupliar stages was precisely traced. The terminology to describe their cephalic shield plates was established.Many y-larvae were collected from Okinawa, some of them were reared in the laboratory. Most species were apparently distinct from the y-larvae in Tanabe Bay.Although the adult of y-larvae was not found, some important, previously unknown characteristics that were common between the Facetotecta and Ascothoracida were discovered. The pleural slat and the copulatory organ with a bifid apex are these examples. It was concluded that the Facetotecta are either part of the Ascothoracida or a distinct thecostracan group closely related to the Ascothoracida.

为了发现Y-larvae的成年人，检查了与来自Tanabe湾各种无脊椎动物相关的甲壳类动物。总共发现了4种属和4种属肢体以及许多cirripedians，但它们似乎都没有产生Y-larvae。新的腹tor骨种类的幼虫分别升级到骨菌化阶段，并发现了许多新事实。与SEM一起研究了眼睛的过程和眼后丝状簇。前者是贝隆奇器官的一部分，后者是著名腺体的一部分。变形后的眼后丝状簇降低到塞浦路斯阶段。在许多物种中，Nauplius Y幼虫通过单个培养成功地升级到塞浦路斯，y阶段。精确地追溯了通过其Naupliar阶段的头屏板板的开发。建立了描述其头膜板的术语。大多数物种显然与Tanabe湾的Y-larvae不同。尽管没有发现Y-larvae的成年，但发现了一些重要的，以前未知的特征，这些特征在刻孔和骨s骨之间很常见。这些例子是胸膜板条和带有双歧杆菌顶点的辅助器官。得出的结论是，Facetotecta要么是肢体骨菌的一部分，要么是与骨s骨密切相关的独特thecostracan群体。

项目成果

Ito, T.: "Naupliar development of Hansenocaris furcifera Ito (Crustacea: Maxillopoda: Facetotecta) from Tanabe Bay, Japan." Publ. Seto Mar. Biol. Lab., 34:(1990).

Ito, T.：“来自日本田边湾的 Hansenocaris curcifera Ito（甲壳纲：Maxillopoda：Facetotecta）的 Naupliar 发育。”

伊藤立則: Zoological Science. 4. 1113 (1987)

伊藤龙典：动物学。4. 1113 (1987)

Ito, T.: "Observation of the larval development of nauplius y (Crustacea: Facetotecta) in the laboratory." Ann. Rep. Seto Mar. Biol. Lab., 4: (1990).

Ito, T.：“实验室观察无节幼体 y（甲壳纲：Facetotecta）幼虫发育。”

Ito, T.: "Origin of the basis in copepod limbs, with reference to remipedian and cephalocarid limbs." J. Crust. Biol., 9:85-103 (1989).

Ito, T.：“桡足类四肢的基础起源，参考桡足类和头足类四肢。”

伊藤立則: "Proposal of new terminology for the morphology of nauplius y (Crustacea:Maxillopoda:Facetotecta),with provisional designation of four naupliar types from Japan" Zool.Sci.4. 913-918 (1987)

Tatunori Ito：“关于无节幼体形态的新术语提案（甲壳纲：Maxillopoda：Facetotecta），临时指定日本的四种无节幼体类型”Zool.Sci.4（1987）。