SciELO - Scientific Electronic Library Online

vol.9 issue4Phytophagous mites (Tetranychoidea: Tetranychidae, Tenuipalpidae) from natural vegetations in Lara, VenezuelaTypes of Plecoptera (Insecta) in the collection of the National Museum (UFRJ), Rio de Janeiro, Brazil author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand




Related links


Biota Neotropica

On-line version ISSN 1676-0611


TAGUTI, Tatia Leika et al. Early development of Pyrrhulina australis Eigenmann & Kennedy, 1903 (Characiformes, Lebiasinidae). Biota Neotrop. [online]. 2009, vol.9, n.4, pp.59-65. ISSN 1676-0611.

This work describes the initial development of Pyrrhulina australis Eigenmann & Kennedy, 1903, the only known Lebiasinidae of the upper Paraná River floodplain. Eighty specimens were analyzed, sixty larvae and twenty juveniles, collected between 1992 and 2005 in several areas (rivers, channels and ponds). From each specimen morphometric and meristic data were obtained and, subsequently, growth patterns were analyzed. Larvae presented greater pigment concentrations in the superior region of the intestine, head and around the mouth. Notochord is characterized by possessing a protrusion that later becomes part of the caudal fin. The fin formation sequence is: caudal, dorsal, anal, pelvic and pectoral. In relation to myomeres we observed that their numbers ranged from 23 to 32 (12-20 preanal and 10-16 postanal). Growth pattern analyses revealed that nose length and eye diameter were allometric, whereas head height and length, as well as body height and pre-pectoral distance were better represented by the piecewise model, revealing that most of the body metamorphosis occurs during the transitional breakpoint between the larval and juvenile periods.

Keywords : Charutinho; ontogeny; larvae; juvenile; Paraná River.

        · abstract in Portuguese     · text in Portuguese     · Portuguese ( pdf epdf )


Creative Commons License All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License