ABSTRACT Development of the limpet Testudinalia testudinalis collected from the White Sea was studied using light and scanning electron microscopy. Cleavage and early development of T. testudinalis were consistent with the general pattern of patellogastropod development, differing in only minor details, such as temperature-dependent developmental rates. A pre-torsional veliger radula was detected by calcofluor white staining of unpolymerized chitin. The veliger radula consisted of nine transverse rows with three teeth per row, which transformed into the radula of newly settled juveniles with five teeth per row (one central and two pairs of lateral teeth). The juvenile radula, with two pairs of lateral and one pair of hook-like marginal teeth, resembled the adult radula in terms of teeth form and co-localization. Radula formation differs between the larva and adult in that each tooth is formed by several odontoblasts and microvillar secretion in the former, whereas it is formed by numerous cells and apocrine secretion in the latter.

中文翻译：

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白海的帽贝 Testudinalia testudinalis (OF Müller, 1776) (Patellogastropoda, Mollusca) 的开发，特别提到了 radula

摘要 使用光学和扫描电子显微镜研究了从白海收集的帽贝 Testudinalia testudinalis 的发育。T. testudinalis 的分裂和早期发育与 patellogastropod 发育的一般模式一致，仅在细微的细节上有所不同，例如温度依赖性发育速率。通过未聚合的几丁质的 calcofluor 白色染色检测到扭转前的 veliger radula。veliger radula由9个横排，每排3颗牙齿组成，转变为每排5颗牙齿（1对中央和2对侧牙）的新定居幼鱼的radula。幼年轮齿有两对侧齿和一对钩状边缘牙齿，在牙齿形状和共定位方面与成年轮齿相似。