National Research Foundation - South African Institute for Aquatic Biodiversity, Makhanda (Grahamstown), South Africa.
Department of Ichthyology and Fisheries Science, Rhodes University, Makhanda (Grahamstown), South Africa.
J Fish Biol. 2021 Jul;99(1):219-239. doi: 10.1111/jfb.14714. Epub 2021 Apr 24.
An integrative taxonomic analysis combining mitochondrial cytochrome oxidase subunit I sequences, morphology, colour pattern and two species delimitation approaches revealed the existence of five lineages within the Natal mountain catfish, Amphilius natalensis, in southern Africa. These lineages are separated by substantial genetic divergences (1.6%-9.46%), and they can be consistently distinguished from one another based on a combination of morphology and colour pattern differences. Additionally, the lineages are allopatrically distributed and confined to isolated river systems draining discrete mountain ranges, which makes gene flow among them unlikely. One of these lineages is A. natalensis s.s., which is confined to the uMngeni and Tukela river systems in KwaZulu Natal (KZN) Province in South Africa. The other four lineages represent new species to science which are described as Amphilius zuluorum sp. nov., endemic to the uMkhomazi River system in KZN, Amphilius engelbrechti sp. nov., endemic to the Inkomati River system in Mpumalanga Province in South Africa, Amphilius marshalli sp. nov., endemic to the Pungwe and Lower Zambezi river systems in Zimbabwe and Mozambique, and Amphilius leopardus sp. nov., endemic to the Ruo River in Malawi. The results show that Amphilius laticaudatus which is endemic to the Buzi River system in Zimbabwe and Mozambique, belongs to the A. natalensis s.l. complex. A redescription of A. laticaudatus is presented and an updated identification key for the mountain catfishes of southern Africa is provided.
一项整合了线粒体细胞色素氧化酶亚基 I 序列、形态、颜色图案和两种物种界定方法的分类学分析揭示了南部非洲纳塔尔山鲶（Amphilius natalensis）内存在 5 个谱系。这些谱系之间存在显著的遗传分化（1.6%-9.46%），并且可以根据形态和颜色图案差异的组合来一致地区分彼此。此外，这些谱系都是地理上隔离的，局限于孤立的河流系统，这些河流系统都源自不同的山脉，这使得它们之间的基因流动不太可能发生。其中一个谱系是 A. natalensis s.s.，仅限于南非夸祖鲁-纳塔尔省的乌姆根尼河和图卡拉河系统。另外四个谱系代表了科学上的新物种，被描述为 Amphilius zuluorum sp. nov.，是夸祖鲁-纳塔尔省乌姆科马齐河系统的特有种；Amphilius engelbrechti sp. nov.，是南非姆普马兰加省因科马蒂河系统的特有种；Amphilius marshalli sp. nov.，是津巴布韦和莫桑比克的蓬圭河和赞比西河下游系统的特有种；以及 Amphilius leopardus sp. nov.，是马拉维的鲁乌河的特有种。研究结果表明，分布于津巴布韦和莫桑比克布济河流域的 Amphilius laticaudatus 属于 A. natalensis s.l. 复合体。本文对 A. laticaudatus 进行了重新描述，并提供了南部非洲山鲶鱼类的最新鉴别特征。
