A New Diminutive Species of Loricaria (Siluriformes: Loricariidae) from the Rio Paraguay System, Mato Grosso do Sul, Brazil

Autor(es)

Rodriguez, Monica S. ; Cavallaro, Marcel R. ; Thomas, Matthew R.

• Tipo de documento: Artigo Científico
• Fonte: Copeia; v. N/A, n. 1, p. 8-pg., 2012-03-30.

Resumo

Loricaria coximensis. new species, is described from the Rio Paraguay basin, in Mato Grosso do Sul State, Brazil. It is distinguished from all other species of Loricaria, except L. holmbergi, L. lundbergi, L. parnahybae, and L. pumila by having abdominal plates confined to the pre-anal shield and posterior median abdominal area, usually loosely joined or separated by naked areas, pectoral girdle mostly naked, with isolated plates near base of pectoral fins and posterior to gill opening vs. abdominal plates well developed and tightly arranged across the entire median abdominal area, including the pectoral girdle. It is distinguished from these other four species by meristic counts and several morphometric proportions, particularly a broader head (19.4-21.3% SL vs. 14.1-19.1% SL). Loricaria coximensis becomes the third described paedomorphic species of Loricaria, along with L. nickeriensis and L. pumila, based on its small adult size (<100 mm SL), reduced number of lateral dermal plates, and incomplete abdominal plate development. The new species is presently known only from a limited section of the Rio Coxim, which has been severely impacted by a hydroelectric dam and widespread conversion of land for agriculture. (AU)

• Processo FAPESP: 09/54931-0 - Melhoria e capacitação das coleções científicas do Departamento de Biologia da Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo
• Beneficiário: Carlos Alberto Garofalo
• Modalidade de apoio: Auxílio à Pesquisa - Programa Infraestrutura - Acervos biológicos
• Processo FAPESP: 07/04701-2 - Relações filogenéticas e biogeografia dos peixes da subfamília Loricariinae a partir da análise de dados morfológicos (Siluriformes: Loricariidae)
• Beneficiário: Mónica Sonia Rodriguez
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 06/54407-0 - Análise filogenética e revisão taxonômica do gênero Microschemobrycon Eigenmann, 1915 (Characiformes: Characidae)
• Beneficiário: Marcel Rodrigo Cavallaro
• Modalidade de apoio: Bolsas no Brasil - Doutorado