Priscilla C. Silva defendeu na última sexta-feira, dia 26 de abril , sua tese de doutorado

SISTEMÁTICA INTEGRATIVA – DIVERSIDADE E RELAÇÕES DE DEUTERODON E GÊNEROS AFINS

A banca esteve constituída pelo

                                                  Prof. Dr. Fernando Rogério de Carvalho (UFMS)

                                                  Prof. Dr. Fernando Camargo Jerep (UEL)

                                                  Prof. Dr. Jorge Abdala Dergam dos Santos (UFV)

Orientada pelo Prof. Dr. Luiz Roberto Malabarba

JULIANA M. WINGERT , JULIANO FERRER, LUIZ R. MALABARBA 

Specimens presently identified as belonging to Odontesthes perugiae species group from rio Paraná, rio Uruguay and rio Negro in Argentina, Brazil and Uruguay are revised. Two species are recognized: Odontesthes perugiae, type species of the genus with Odontesthes orientalis as a junior synonym, and a new species described herein. Odontesthes perugiae is redescribed and its distribution restricted to the lower rio Paraná, lower rio Uruguay and rio Negro basins. The new species is endemic from the upper rio Uruguay above Salto do Yucumã (Brazil) or Saltos del Moconá (Argentina) falls. Both species share with the remaining taxa included in the O. perugiae species-group (O. bicudo, O. ledae, O. mirinensis, and O. piquava) the possession of teeth of the outer row on dentary and premaxilla shorter than those in the inner row, being distinguished from them by the number of gill rakers, body measurements and some osteological characters.

Artigo completo: http://biotaxa.org/Zootaxa/article/view/zootaxa.4250.6.1

FIGURE 17. Odontesthes yucuman, nontype, UFRGS 19389, 168.7 mm SL, just after fixation, rio Uruguay at reservoir of the Itá Hydroelectric Power Plant, Itá, Santa Catarina State, Brazil (Photo by Renata Guereschi).

FIGURE 18. Detail of teeth on dentary and premaxilla from medial view of Odontesthes yucuman, paratype, UFRGS 17840, 114.2 mm SL, indicating the small teeth of the outer row and the large teeth of the inner row. Scale bar = 1 mm.

FIGURE 5. Lateral views of head of Odontesthes perugiae (a), MCP 43030, 148.5 mm SL, and O. yucuman (b), paratype, UFRGS 11671, 156.6 mm SL, showing the differences in head shape and size of snout and eye.

Priscilla C. Silva, Maria C. Malabarba, Luiz R. Malabarba

Accurate identification is essential for any study exploring biodiversity. Unfortunately, museum type specimens preserved for more than a hundred years are often not informative enough for precise identification of the species represented by the name-bearing type. The use of ancient DNA can help solve taxonomic problems when name-bearing types no longer have diagnostic morphological features that allow for an accurate identification of the species involved. That is the case for Deuterodon pedri, an endemic species from a small drainage in the rio Doce basin in Minas Gerais, Brazil, for which the type material is in poor condition. Specimens of D. pedri were collected in 1865 by the Thayer Expedition to Brazil and fixed in spirits, enabling them to yield viable DNA. As the morphology alone of the type material does not allow for an accurate identification, we used both morphological and ancient DNA (aDNA) methods to decisively establish the identity of D. pedri. This identification allowed us to recognize the species among recently collected specimens and then, based on them, redescribe the species. A genetype for the lectotype of D. pedri is presented.

Artigo: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252017000100224&lng=en&nrm=iso&tlng=en

Fig. 3 Two paralectotypes of Deuterodon pedri, MCZ 17510. a-c. Photograph and X-ray computed tomography of the paralectotype with 72.1 mm SL, showing the dentary teeth decreasing gradually in size, corresponding to D. pedri. b-d. Photograph and X-ray computed tomography of the paralectotype with 58.6 mm SL, showing the dentary teeth decreasing abruptly, corresponding to Astyanax intermedius. 

Fig. 2 Neighbor Joining tree and Haplotype network showing high similarity between specimens collected at rio Santo Antônio basin and sequence of the lectotype of Deuterodon pedri. a. Neighbor joining tree with bootstrap values. b. Haplotype network of D. pedri clade. Numbers in each branch of the net refer to number of mutational steps between haplotypes.