Datovo Aléssio
Museu de Zoologia da Universidade de São Paulo, Laboratório de Ictiologia; Av. Nazaré, 481, 04263-000; São Paulo, SP, Brazil.; Email:
Zootaxa. 2014 Apr 22;3790:466-76. doi: 10.11646/zootaxa.3790.3.5.
A new species of the trichomycterid catfish genus Ituglanis is described from the Rio Curuá, Rio Xingu basin, Rio Amazonas drainage, Brazil. Ituglanis apteryx, new species, is promptly distinguished from congeners, except some specimens of I. parahybae (Eigenmann), by the absence of pelvic fins, girdle, and muscles. The new species differs from I. parahybae in the pattern of the cephalic laterosensory system; the absence of a posterior cranial fontanel; the presence of an epural; and the number of branchiostegal rays, ribs, and vertebrae. Ituglanis apteryx is one among the several trichomycterids lacking pelvic fins. Analysis reveals that pelvic fin loss independently evolved several times during the trichomycterid radiation.
一种新的毛鼻鲶属鲶鱼物种被描述于巴西亚马逊河水系兴谷河盆地的库鲁阿河。无鳍毛鼻鲶，新物种，除了一些帕拉伊巴毛鼻鲶（ Eigenmann）的标本外，很容易通过没有腹鳍、腰带和肌肉与同属其他物种区分开来。新物种在头部侧线感觉系统模式、没有后颅囟、存在尾上骨以及鳃盖条、肋骨和椎骨数量上与帕拉伊巴毛鼻鲶不同。无鳍毛鼻鲶是几种没有腹鳍的毛鼻鲶之一。分析表明，在毛鼻鲶的辐射演化过程中，腹鳍缺失独立进化了好几次。
