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Article
Published: 2018-02-02

Crenicichla ploegi, a new species of pike-cichlid of the C. saxatilis group from the Rio Juruena and upper Rio Paraguai basins in Brazil, with an updated diagnosis and biogeographical comments on the group (Teleostei: Cichlidae)

Departamento de Zoologia, Instituto de Biologia, Universidade Federal da Bahia, Campus de Ondina, Rua Barão de Geremoabo s/n, 40170-115 Salvador, BA, Brazil. Museu de Zoologia da Universidade de São Paulo, Caixa Postal 42494, 04218–970 São Paulo, SP, Brazil.
Museu de Zoologia da Universidade de São Paulo, Caixa Postal 42494, 04218–970 São Paulo, SP, Brazil.
Museu de Zoologia da Universidade Estadual de Campinas "Adão José Cardoso", Caixa Postal 6109, 13083-970 Campinas, SP, Brazil.
Department of Zoology, Swedish Museum of Natural History, POB 50007, SE-104 05 Stockholm, Sweden.
Pisces biogeography coloration paedomorphy species groups

Abstract

Crenicichla ploegi, new species, is described based on material from the Rio Juruena (Rio Papagaio, Rio do Sangue, Rio Arinos, and Rio Juruena itself) and from tributaries of the upper Rio Paraguai (upper Rio Jauru, upper Rio Cabaçal and upper Rio Sepotuba) in Mato Grosso, Brazil. Crenicichla ploegi is the twenty-third species of the C. saxatilis group. It is distinguished from all other species of the group by the presence of dark spots and vermiculations on snout, interorbital area and dorsally on head in adults vs. dark markings absent or present only in juveniles but absent in adults, and by the presence of a deep and strongly pigmented lateral band present in both juveniles and adults, occupying a depth of 4–6 horizontal scale rows vs. lateral band narrower, occupying a depth of 2–3 horizontal scale rows, and conspicuous only in juveniles and smaller specimens, faded or absent in larger specimens. Diagnostic characteristics of the C. saxatilis group proposed in previous studies were discussed to update the diagnosis of the group, and morphological comparisons among the species included in the group, with biogeographical comments, are provided. The presence of conspicuous dark markings dorsally on the head and the presence of a prominent midlateral band are hypothesized to be paedomorphic characteristics, retained from juvenile conditions in the context of the species of the C. saxatilis group.

 

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How to Cite

VARELLA, H. R., LOEB, M. V., LIMA, F. C., & KULLANDER, S. O. (2018). <em>Crenicichla</em> <em>ploegi</em>, a new species of pike-cichlid of the <em>C. saxatilis</em> group from the Rio Juruena and upper Rio Paraguai basins in Brazil, with an updated diagnosis and biogeographical comments on the group (Teleostei: Cichlidae). Zootaxa, 4377(3), 361–386. https://doi.org/10.11646/zootaxa.4377.3.3