Abstract

The amphidromous species of Macrobrachium Spence Bate, 1868 occurring on the Mexican Pacific slope (M. americanum Spence Bate, 1868, M. digueti (Bouvier, 1895), M. hobbsi Nates & Villalobos in Villalobos Hiriart & Nates Rodríguez, 1990, M. occidentale Holthuis, 1950 (Holthuis, 1950b), and M. tenellum (Smith, 1871)) show a disjunct distribution, with the abscence of records along about 2000 km of the coastal margins in the northern Gulf of California. Recent morphological and genetic studies using the mitochondrial genes 16S rRNA (16S) and cytochrome oxidase I (COI) show that individuals of the putative M. digueti, M. hobbsi, and M. occidentale from the Baja California Peninsula are conspecific to their respective taxonomic entities found along the Pacific slope of mainland Mexico. We review the systematics of M. americanum from the Mexican Pacific slope and found that individuals of putative M. americanum from the Baja California Peninsula belong to the same lineage of individuals from the Pacific slope of mainland Mexico based on newly generated fragments of the mitochondrial genes 16S (491 bp) and COI (548 bp). We present a systematic account for M. americanum, including a taxonomic treatment of the studied populations with a report of their genetic identity and phylogenetic relationships.

中文翻译：

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来自墨西哥太平洋斜坡的两栖虾对虾Macrobrachium americanum Spence Bate，1868年（十足目：Caridea：Palaemonidae）的系统学

摘要

Macrobrachium Spence Bate，1868的两栖种在墨西哥太平洋斜坡上发生（M. americanum Spence Bate，1868，digueti（Bouvier，1895），M. hobbsi Nates和Villalobos在Villalobos Hiriart和NatesRodríguez，1990，M. occidentale Holthuis，1950年（Holthuis，1950b）和M. tenellum（Smith，1871）显示出不同的分布，在加利福尼亚湾北部约2000 km的沿海边缘没有记录。使用线粒体基因16S rRNA（16S）和细胞色素氧化酶I（COI）进行的近期形态学和遗传学研究表明，推定的M. digueti，M。hobbsi和来自下加利福尼亚州半岛的西方球菌（M. occidentale）与在墨西哥大陆的太平洋斜坡上发现的它们各自的生物分类实体有关。我们回顾了来自墨西哥太平洋斜坡的美洲分枝杆菌的系统学，发现根据新产生的线粒体基因片段，来自下加利福尼亚州半岛的推定美洲分枝杆菌的个体属于来自墨西哥大陆太平洋斜坡的个体的同一谱系16S（491 bp）和COI（548 bp）。我们提出了一种对美洲分枝杆菌的系统描述，包括对研究种群的分类学治疗及其遗传特性和系统发生关系的报告。