Karla S. Barragán

Loading metrics The images for Figs 1 and 2 are incorrectly switched. The image that appears as Fig 1 should be Fig 2, and the image that appears as Fig 2 should be Fig 1. The images for Figs 7 and 8 are incorrectly switched. The image that appears as Fig 7 should be Fig 8, and the image that appears as Fig 8 should be Fig 7. The figure captions appear in the correct order. Fig 1. Rhyacoglanis pulcher, MECN-DP 4372, 82.1 mm SL, new record collected in Villano river, Napo river basin, Ecuador.

1. Introduction Studies analyzing the variation of fish shape, size, and weight are often performed with preserved specimens in museum collections [1]. Fixation methods include freezing [2, 3], smoking [4], Davidson’s B, Borealene [5], and isopropyl alcohol; however, the most common and accepted form to preserve fish specimens is with fixation in 10% formalin (HCOH) and then transfer to 70% ethanol (EtOH) for long-term museum storage [5, 6].