We describe a new species of arboreal microhylid frog, genus Platypelis, from northeastern Madagascar and report the expansion of distribution ranges of two other species. Platypelis laetus sp. nov. is small to medium-sized (24.3–25.6 mm snout-vent length) compared to other Platypelis, exhibits a greenish colored throat and was found in bamboo forest of the Sorata Massif. Its advertisement call consists of a single short tonal note repeated at regular intervals in long call series. Based on DNA sequences of a fragment of the mitochondrial 16S rRNA gene, the new species was placed in a clade with Platypelis olgae from the Tsaratanana Massif, and with two other, unconfirmed candidate species from the Sorata Massif and from Andravory, herein named Platypelis sp. Ca12 and Ca13. Molecular divergences among these lineages were substantial, amounting to 7.6‒8.1% uncorrected 16S p-distance to the closest nominal species, P. olgae, from which the new species is also distinguished by a lack of allele sharing in the nuclear RAG-1 gene. We also provide new records of Platypelis alticola and P. tsaratananaensis from the Sorata Massif, supported by molecular analysis. This confirms a wider distribution of these two species that previously were considered to be endemic to the Tsaratanana Massif. However, their populations in Sorata were characterized by a certain degree of genetic differentiation from Tsaratanana populations suggesting they require more detailed taxonomic assessment.

中文翻译：

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来自马达加斯加北部索拉塔地块的扁平蛙属：一个新物种的描述和范围扩展的报告

我们描述了来自马达加斯加东北部的一种新的树栖 microhylid 蛙属 Platypelis，并报告了其他两种物种分布范围的扩大。Platypelis laetus sp. 十一月 与其他 Platypelis 相比，是中小型（24.3-25.6 毫米的口鼻部长度），喉部呈绿色，发现于 Sorata 地块的竹林中。它的广告呼叫由在长呼叫系列中定期重复的单个短音调组成。基于线粒体 16S rRNA 基因片段的 DNA 序列，新物种被放置在一个进化枝中，其中包括来自 Tsaratanana 地块的 Platypelis olgae，以及来自 Sorata 地块和 Andravory 的另外两个未经证实的候选物种，在此命名为 Platypelis sp . Ca12 和 Ca13。这些谱系之间的分子差异很大，与最接近的标称物种 P. olgae 的未校正 16S p 距离达到 7.6-8.1%，新物种的区别还在于核 RAG-1 基因中缺乏等位基因共享。我们还提供了来自 Sorata 地块的 Platypelis alticola 和 P. tsaratananaensis 的新记录，并得到了分子分析的支持。这证实了这两种以前被认为是 Tsaratanana 地块特有的物种的更广泛分布。然而，它们在 Sorata 中的种群的特点是与 Tsaratanana 种群有一定程度的遗传差异，这表明它们需要更详细的分类评估。我们还提供了来自 Sorata 地块的 Platypelis alticola 和 P. tsaratananaensis 的新记录，并得到了分子分析的支持。这证实了这两种以前被认为是 Tsaratanana 地块特有的物种的更广泛分布。然而，它们在 Sorata 中的种群的特点是与 Tsaratanana 种群有一定程度的遗传差异，这表明它们需要更详细的分类评估。我们还提供了来自 Sorata 地块的 Platypelis alticola 和 P. tsaratananaensis 的新记录，并得到了分子分析的支持。这证实了这两种以前被认为是 Tsaratanana 地块特有的物种的更广泛分布。然而，它们在 Sorata 中的种群的特点是与 Tsaratanana 种群有一定程度的遗传差异，这表明它们需要更详细的分类评估。