Intrauterine and post‐ovipositional embryonic development of Amerotyphlops brongersmianus (Vanzolini, 1976) (Serpentes: Typhlopidae) from northeastern Argentina,Journal of Morphology

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Intrauterine and post‐ovipositional embryonic development of Amerotyphlops brongersmianus (Vanzolini, 1976) (Serpentes: Typhlopidae) from northeastern Argentina
Journal of Morphology ( IF 1.5 ) Pub Date : 2020-04-01 , DOI: 10.1002/jmor.21119
María Teresa Sandoval ₁ , José Augusto Ruiz García ₁ , Blanca Beatriz Álvarez ₁

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The reproductive biology and embryonic development of Typhlopidae have rarely been explored. This family of snakes includes mostly oviparous species with uterine egg retention, but the morphology and development of embryos remain unknown. This work aimed to describe the embryonic development of Amerotyphlops brongersmianus from the northeast of Argentina. For this purpose, embryos from intrauterine eggs of gravid females and eight post‐ovipositional eggs incubated in the laboratory were analyzed. Embryonic stages, corresponding to the early, mid and advanced development, and a hatchling were described. The main organs and systems form during the period of intrauterine embryonic retention. Comparing to other snakes, differences in the development of cranial structures such as encephalic vesicles and mandibular and maxillary processes were identified. After oviposition the development and differentiation of the tissues and organs completes, the body scales develop, the characteristic pattern of pigmentation establishes and the embryo grows and consumes the yolk. On average, the incubation period lasts 55 days. Differences in the stage of development at oviposition among females of different populations were observed. Embryonic retention could extend up to advanced stages of development.

中文翻译：

来自阿根廷东北部的 Amerotyphlops brongersmianus (Vanzolini, 1976) (Serpentes: Typhlopidae) 的宫内和产卵后胚胎发育

很少有人探索过斑蝥科的生殖生物学和胚胎发育。这个蛇科包括大部分具有子宫卵子保留的卵生物种，但胚胎的形态和发育仍然未知。这项工作旨在描述来自阿根廷东北部的 Amerotyphlops brongersmianus 的胚胎发育。为此，我们分析了来自妊娠女性的宫内卵子和实验室中孵化的 8 个产卵后卵子的胚胎。描述了对应于早期、中期和高级发育的胚胎阶段和孵化器。主要器官和系统在宫内胚胎滞留期间形成。与其他蛇类相比，确定了颅骨结构发育的差异，例如脑囊泡和下颌骨和上颌骨突起。产卵后，组织和器官的发育和分化完成，体鳞发育，色素沉着的特征模式建立，胚胎生长并消耗蛋黄。潜伏期平均为55天。观察到不同种群雌性产卵发育阶段的差异。胚胎保留可以扩展到发育的高级阶段。观察到不同种群雌性产卵发育阶段的差异。胚胎保留可以扩展到发育的高级阶段。观察到不同种群雌性产卵发育阶段的差异。胚胎保留可以扩展到发育的高级阶段。

更新日期：2020-04-01

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