Increasingly, new species are being described without there being a name-bearing type specimen. In 2015, a new species of primate was described, the golden-crowned langur Presbytis johnaspinalli Nardelli, 2015 on the basis of five photographs that were posted on the Internet in 2009. After publication, the validity of the species was questioned as it was suggested that the animals were partially and selectively bleached ebony langurs Trachypithecus auratus (É. Geoffroy Saint-Hilaire, 1812). Since the whereabouts of the animals were unknown, it was difficult to see how this matter could be resolved and the current taxonomic status of P. johnaspinalli remains unclear. I present new information about the fate of the individual animals in the photographs and their species identification. In 2009, thirteen of the langurs on which Nardelli based his description were brought to a rescue centre where, after about three months, they regained their normal black colouration confirming the bleaching hypothesis. Eight of the langurs were released in a forest and two were monitored for two months in 2014. The description of their behaviour, photographs and analysis of their cytochrome b genes confirms them as ebony langurs. There is no evidence to support the notion that the golden-crowned langur represents intermediates between melanistic and erythristic ebony langurs, nor that it represents a new species. As such, Presbytis johnaspinalli Nardelli, 2015 is a junior synonym of Trachyptihecus auratus (É. Geoffroy Saint-Hilaire, 1812). This case underscores the importance of assembling a sufficiently varied amount of data prior to describing new species and studying the actual type specimens.

中文翻译：

---

不再仅凭照片就行了：驳斥了金冠叶猴Presbytis johnaspinalli Nardelli 2015（哺乳动物，灵长类动物，Cercopithecidae）的有效性

越来越多的物种被描述为新物种，而没有命名型标本。2015年，根据2009年在互联网上发布的五张照片，描述了一种新的灵长类动物，即金冠叶猴Presbytis johnaspinalli Nardelli，2015年。发表后，对该物种的有效性提出了质疑。动物被部分和选择性地漂白了乌木叶猴Trachypithecus auratus（É。Geoffroy Saint-Hilaire，1812）。由于这些动物的下落不明，因此很难看到如何解决该问题，并且目前尚不清楚约翰逊疟原虫的分类学状况。我在照片中提供了有关个别动物的命运及其物种识别的新信息。在2009年，Nardelli将其描述所依据的叶猴中的13种带到了救援中心，在大约三个月后，他们恢复了正常的黑色，这证实了漂白的假设。2014年，八种叶猴在森林中被释放，其中两个被监测了两个月。对其行为的描述，照片以及细胞色素b基因的分析证实它们为乌木叶猴。没有证据支持这一观点，即金冠叶猴代表黑变种和红变种乌木叶猴之间的中间产物，也不代表新物种。因此，Presbytis johnaspinalli Nardelli（2015年）是Trachyptihecus auratus（É。Geoffroy Saint-Hilaire，1812年）的缩写。