ABSTRACT. Microsternarchus bilineatus Fernández-Yépez, 1968 is a small, inconspicuous electric fish distributed in the Orinoco, Amazon and Tocantins basins. Its holotype and paratypes from Río San José, a tributary of Río Guariquito, Orinoco basin, Venezuela, are apparently lost. We examined 14 specimens collected in Río San Bartolo, also a tributary of Río Guariquito, 110 km by river from Río San José. Because of its proximity to the type locality and apparent conformity to the original description, we used these newly collected specimens to redescribe M. bilineatus using external morphology, morphometrics, meristics, and osteology including high-resolution X-ray computed tomography. In order to address geographic variation we compared Río San Bartolo specimens with others of, or close to, M. bilineatus from Casiquiare river and from two streams in Roraima state, Brazil. In our analysis specimens from distant localities differ in the interobital distance and mouth size, number of anal-fin rays and skeletal features in the dentary and cranial fontanelles. Detailed revision of the genus will require a stable description of type species. Therefore, we designate INHS 111262 as neotype for M. bilineatus.
摘要Microsternarchus bilineatus Fernández-Yépez, 1968是一种小型、不显眼的电鱼，分布在Orinoco、Amazon和Tocantins盆地。来自委内瑞拉奥里诺科河盆地Río瓜里基多的一条支流Río San jos的全型和准型显然已经丢失。我们检查了在Río San Bartolo采集的14个标本，该标本也是Río Guariquito的一条支流，距离Río San jos 110公里。由于其接近类型位置并且明显符合原始描述，我们使用这些新收集的标本使用外部形态学，形态计量学，分类学和骨学(包括高分辨率x射线计算机断层扫描)重新描述双线分枝杆菌。为了解决地理差异，我们将Río圣巴托洛标本与来自巴西卡西奎阿尔河和罗赖马州两条溪流的其他或接近的M. bilineatus标本进行了比较。在我们的分析中，来自遥远地区的标本在眶间距离和嘴的大小、肛门鳍射线的数量以及牙齿和颅囟门的骨骼特征上存在差异。该属的详细修订将需要对模式种的稳定描述。因此，我们将INHS 111262指定为双头分枝杆菌的新类型。
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{"title":"“At What do you Think the Ladies will Stop?” Women at the Academy","authors":"P. Stroud","doi":"10.1635/053.162.0116","DOIUrl":"https://doi.org/10.1635/053.162.0116","url":null,"abstract":"","PeriodicalId":54579,"journal":{"name":"Proceedings of the Academy of Natural Sciences of Philadelphia","volume":"162 1","pages":"195 - 206"},"PeriodicalIF":0.7,"publicationDate":"2013-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1635/053.162.0116","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67547078","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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