| 史令,李雯佳,尉鹏,赖思琦,黄现鹏,田莹.2022.四种翁戎螺的齿舌形态及功能.动物学杂志,57(6):913-921. |
| 四种翁戎螺的齿舌形态及功能 |
| The Form and Function of the Radula in Four Pleurotomariidae Species |
| 投稿时间：2021-06-14 修订日期：2022-11-28 |
| DOI：10.13859/j.cjz.202206011 |
| 中文关键词: 翁戎螺科 齿舌 形态学 分类学 扫描电镜 |
| 英文关键词:Pleurotomariidae Radula Morphology Taxonomy Scanning electron microscope |
| 基金项目:国家重点研发计划项目（No. 2021YFB2600200），国家自然科学基金项目（No. 4207060201） |
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| 中文摘要: |
| 翁戎螺（Pleurotomariidae）起源于寒武纪时期，是介于软体动物祖先和现代腹足类之间的过渡类型。目前我国翁戎螺的分类、生态等方面研究不足，为探究翁戎螺的形态分类及食性，以寺町翁戎螺（Bayerotrochus teramachii）、红翁戎螺（Mikadotrochus hirasei）、高腰翁戎螺（M. salmianus）和龙宫翁戎螺（Entemnotrochus rumphii）为研究对象，应用扫描电镜观察其齿舌结构。结果表明，（1）翁戎螺齿舌结构与大多数腹足类具有3种类型的齿舌不同，其齿舌带上具有中央齿、内侧齿、外侧齿、镰状齿、丝状齿和桨状齿6种不同类型的小齿。（2）4种翁戎螺的中央齿均为1枚，内侧齿2或3枚，外侧齿20 ~ 25枚，镰状齿16 ~ 32枚，丝状齿35 ~ 62枚，桨状齿10 ~ 26枚。（3）翁戎螺属（Mikadotrochus）内种类之间齿舌形态的差异较小，进行种间区分需结合其小齿数量，但属间差异较大，中央齿、内侧齿、镰状齿的齿尖和齿基形态都可以进行属间区分。（4）龙宫翁戎螺齿舌带每个横排具有26枚桨状齿，与之前研究具有10枚不同。本研究对翁戎螺镰状齿和丝状齿之间、丝状齿和桨状齿之间的过渡形态进行深入地描述和划分。本研究结果可为我国翁戎螺的形态分类研究提供资料。 |
| 英文摘要: |
| [Objectives] The radular morphology of four Pleurotomariidae species, i.e., Bayerotrochus teramachii, Mikadotrochus hirasei, M. salmianus, and Entemnotrochus rumphii from the East China Sea were examined by scanning electron microscopy (SEM). We provide clear SEM images of the radula of Pleurotomariidae to further discuss the application of radula to Pleurotomariidae taxonomy. [Methods] The shells were broken into pieces using a hammer, and the visceral mass was removed with a dissecting needle to obtain the internal tissue. The radula was removed using a knife and analyzed under an anatomical lens (CEWEI PXS9-T). Any remaining soft tissue was soaked in 10% NaOH for 4 h, until complete dissolution, following which they were cleaned using an ultrasonic cleaner (GT SONIC-D2) for 2 min, rinsed in distilled water, dried. Radula samples were mounted on sticky tabs, sputter-coated with gold, and imaged under low vacuum. The prepared samples were sputter-coated with gold, using a Cressington Sputter Coater 108auto, and analyzed using a scanning electron microscope (SEM; TESCAN Vega3). Cleaned radulae that haven't been used for SEM were mounted on a glass slide in water, covered with microscopic glass, and observed under a compound microscope (CEWEI PXS9-T). Radular teeth were photographed using a camera attached to the microscope. The portion of the radula that was not coated was observed using an optical microscope. [Results] The radula of Pleurotomariidae species is different from that of most gastropods, with six different types of teeth: rachidian tooth, inner lateral teeth, outer lateral teeth, sickle teeth, filament-tipped teeth and paddle-shaped teeth (Fig. 2). The four Pleurotomariidae species in this study all have 1 rachidian tooth, 2 or 3 inner lateral teeth, 20﹣25 outer lateral teeth, 16﹣32 sickle teeth, 35﹣62 filament-tipped teeth and 10﹣26 paddle-shaped teeth (Table 2). [Conclusion] The morphological differences of the radula are less within genera and greater between genera, which is mainly reflected in rachidian tooth, inner lateral teeth, and the cusps and bases of sickle teeth. The radula of E. rumphii has 26 vertical rows of paddle-shaped teeth, unlike the previous study which had 10 vertical rows. The transition between sickle teeth and filament-tipped teeth and filament-tipped teeth and paddle-shaped teeth are described in-depth, two criteria were proposed to help to determine the number of these three types of teeth. |
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