We describe a new species of Leucostethus from Gorgona Island, a small (13 km2) island located 35 km from the Pacific coast of southern Colombia. The new species most resembles L. argyrogaster and L. fugax from western Amazonia at 340–870 m elev. in Peru and Ecuador, with which it shares pale ventral coloration and orange suffusion of the axilla, groin and concealed surfaces of the hind limb, but it is most closely related to L. bilsa from ca. 340 km SW in the southern Chocó at 420–515 m elev., northwestern Ecuador. We report miniscule white spots on the posteroventral surface of the thighs of the new species and, on the basis of our preliminary assessment of their taxonomic distribution, hypothesize that their presence is a synapomorphy of Dendrobatoidea with subsequent losses in a few groups. Given the apparent restriction of the new species to Gorgona Island, it is Vulnerable according to IUCN Red List criteria. In addition to naming the new species, we also propose the following new combinations: L. alacris (Rivero and Granados-Díaz, 1990) comb. nov., L. dysprosium (Rivero and Serna, 2000) comb. nov., and L. yaguara (Rivero and Serna, 1991) comb. nov.

中文翻译：

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哥伦比亚戈尔戈纳岛的一新种 Leucostethus (Anura, Dendrobatidae)

我们描述了来自戈尔戈纳岛的 Leucostethus 新物种，这是一个距离哥伦比亚南部太平洋海岸 35 公里的小岛（13 平方公里）。这个新物种在海拔 340-870 米处与亚马逊西部的 L. argyrogaster 和 L. fugax 最为相似。在秘鲁和厄瓜多尔，它的腋窝、腹股沟和后肢的隐蔽表面具有浅腹侧颜色和橙色，但与来自约 厄瓜多尔西北部海拔 420-515 米的乔科南部西南 340 公里处。我们报告了新物种大腿后腹面的微小白点，并根据我们对它们的分类分布的初步评估，假设它们的存在是 Dendrobatoidea 的突触，随后在几个群体中消失。鉴于新物种对戈尔戈纳岛的明显限制，根据 IUCN 红色名录标准，它是脆弱的。除了命名新物种外，我们还提出了以下新组合：L. alacris（Rivero 和 Granados-Díaz，1990）梳子。11 月，L. 镝（Rivero 和 Serna，2000 年）梳。11 月，和 L. yaguara（Rivero 和 Serna，1991 年）梳理。十一月