Gymnocorymbus Eigenmann, 1908

Benine, Ricardo C., Melo, Bruno F., Castro, Ricardo M. C. & Oliveira, Claudio, 2015, Taxonomic revision and molecular phylogeny of Gymnocorymbus Eigenmann, 1908 (Teleostei, Characiformes, Characidae), Zootaxa 3956 (1), pp. 1-28 : 10

publication ID

https://doi.org/10.11646/zootaxa.3956.1.1

publication LSID

lsid:zoobank.org:pub:14870FDE-0B98-4B53-A9F5-F2FBAD0A761E

DOI

https://doi.org/10.5281/zenodo.6105511

persistent identifier

https://treatment.plazi.org/id/846387A3-FFCC-3740-B7D0-FC7AFEA7F998

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Plazi (2016-04-19 08:10:39, last updated 2024-11-27 08:38:06)

scientific name

Gymnocorymbus Eigenmann, 1908
status

 

Gymnocorymbus Eigenmann, 1908 View in CoL View at ENA

Gymnocorymbus Eigenmann, 1908:93 View in CoL . Type species: Gymnocorymbus thayeri Eigenmann, 1908 View in CoL . Type by original designation. Gender: Masculine.

Diagnosis. In addition to the three features described under “Morphological support for monophyly and interrelationships within Gymnocorymbus ”, the combination of the following characters externally discriminate Gymnocorymbus within the Characidae : the predorsal area naked or with an irregular series of scales; the deep body (around 50% in SL); the 7–9 horizontal scale rows between the lateral line and the dorsal-fin origin; the elongate anal fin with iv,31–40 rays; the sheath of 2–6 horizontal rows of scales covering the anal-fin base; a sheath of scales covering the proximal two thirds of the lobes of caudal fin; and the absence of a predorsal spine.

Distribution. Gymnocorymbus is widely distributed in lowlands of the Orinoco, Corantijn, Amazon and Paraguay basins, and in the Rio Gurupi and Rio Parnaíba in northeastern Brazil ( Fig. 9 View FIGURE 9 ). Introduced populations of G. ternetzi occur in marginal lagoons of the Rio Mogi-Guaçu and Rio Grande, tributaries of the upper Rio Paraná and also in the upper Rio Paraíba do Sul in southeastern Brazil ( Fig. 9 View FIGURE 9 ). The reported occurrence of Gymnocorymbus thayeri in Trinidad and Tobago ( Phillip et al. 2013) could not be confirmed due to the impossibility of examine the associated vouchers.

Etymology. Gymnos from Greek, meaning naked; corymbus from Greek, meaning summit. Eigenmann (1908) refered to the smooth predorsal line due to absence of scales and/or the presence of a thick layer of epidermic cells in that area.

Eigenmann, C. (1908) Preliminary descriptions of new genera and species of tetragonopterid characins. Bulletim of the Museum of Comparative Zoology, 52, 91 - 106.

Phillip, D. A. T., Taphorn, D. C., Holm, E., Gilliam, J. F., Lamphere, B. A. & Lopez-Fernandez, H. (2013) Annotated list and key to the stream fishes of Trinidad & Tobago. Zootaxa, 3711 (1), 1 - 64. http: // dx. doi. org / 10.11646 / zootaxa. 3711.1.1

Gallery Image

FIGURE 9. Distribution map showing collecting localities of examined specimens of Gymnocorymbus bondi (white circles), G. flaviolimai (red circles), G. ternetzi (blue circles) and G. thayeri (yellow circles). White lines represent country boundaries.

Kingdom

Animalia

Phylum

Chordata

Class

Actinopterygii

Order

Characiformes

Family

Characidae