Carnegiella Genus 
The genus Carnegiella belongs to the family Gasteropelecidae, in which there are two other genera: Gasteropelecus and Thorachocarax.
The Carnegiella genus is distinguished from the other genera of the family: by the absence of an adipose fin and also by its relatively smaller size in relation to the other gasteropelecids.
Like the other representatives of the family, the Carnegiella species also have a strongly pronounced pectoral region, elongated pectoral fins and positioned upwards.
In the Carnegiella genus, the region of insertion of the muscles of the pectoral fins is modified into a large and tapered thoracic keel. These modifications make these fishes able to jump out of the water similar to a flight, so they are
known in the Amazon as butterfly fish.
The genus Carnegiella has four species: Carnegiella marthae; Carnegiella myersi; Carnegiella schereri and Carnegiella strigata.
The species of this genus, characterized by the lack of an adipose fin, are the smallest and most beautiful of hatchetfishes.
Know some of these species by clicking on the links:
Identification key of the genus Carnegiella:
1. Body with a marble appearance, with wide bands that extend from the keel to the dorsum ......................................................................Carnegiella strigata
1'. Body with small spots or lines ..................................................2
2. Keel with spots or narrow parallel lines, sometimes with a black border; pectoral fins with a black band; quite deep body; lack of circorbital bones; anal fin with less than 31 rays; maxilla with less than 3 teeth ....3
2'. Keel with black edge, smooth or with some points; flat pectoral fins; relatively elongated body (with respect to an ax fish); 2nd to 5th circumorbital bones present; 33-36 anal rays; maxilla with 4-5 teeth ......Carnegiella myersi
3. It presents the belly with dark spots .............................Carnegiella schereri
3 '. It presents the belly with dark stripes .........................Carnegiella marthae
Carnegiella species are polyptic, which means that two or more distinct populations can be recognized within species concepts, and separated as subspecies.
In other words, the genus Carnegiella is known for the polymorphism of its species, where a species can have different patterns or show different forms; depending on the locations fishes inhabit, there may also be differences within each subspecies, such as variability in the color pattern, body proportions or numbers of dorsal and anal rays.
References:
INSTRUÇÃO NORMATIVA INTERMINISTERIAL N°1, DE 3 DE JANEIRO DE 2012. Diário Oficial da União – Seção I, Nº3, quarta-feira, 4 de janeiro de 2012, páginas 26 a 42 – ISSN 1677-7042 INI MPA-MMA (n01-2012 - Peixes Ornamentais Continentais.pdf)
Burt, A., D.L. Kramer, K. Nakatsuru and C. Spry, 1988. The tempo of reproduction in Hyphessobrycon pulchripinnis (Characidae), with a discussion on the biology of 'multiple spawning' in fishes. Environ. Biol. Fish. 22(1):15-27.
Géry, J., 1977. Characoids of the world. Neptune City ; Reigate : T.F.H. [etc.]; 672 p. : ill. (chiefly col.) ; 23 cm.
Lima, F.C.T., L.R. Malabarba, P.A. Buckup, J.F. Pezzi da Silva, R.P. Vari, A. Harold, R. Benine, O.T. Oyakawa, C.S. Pavanelli, N.A. Menezes, C.A.S. Lucena, M.C.S.L. Malabarba, Z.M.S. Lucena, R.E. Reis, F. Langeani, C. Moreira et al. …, 2003. Genera Incertae Sedis in Characidae. p. 106-168. In R.E. Reis, S.O. Kullander and C.J. Ferraris, Jr. (eds.) Checklist of the Freshwater Fishes of South and Central America. Porto Alegre: EDIPUCRS, Brasil.
Lucena, C.A.S. and N.A. Menezes, 2003. Subfamily Characinae (Characins, tetras). p. 200-208. In R.E. Reis, S.O. Kullander and C.J. Ferraris, Jr. (eds.) Checklist of the Freshwater Fishes of South and Central America. Porto Alegre: EDIPUCRS, Brasil.
Mattox, G.M.T., Britz, R., Toledo-Piza, M. & Marinho, M.M.F. (2013): Cyanogaster noctivaga, a remarkable new genus and species of miniature fish from the Rio Negro, Amazon basin (Ostariophysi: Characidae). Ichthyological Exploration of Freshwaters, 23 (4) [2012]: 297-318.
Moreira, C.R. 2007. Relações filogenéticas na ordem Characiformes (Teleostei: Ostariophysi). Tese de doutorado não publicada, Universidade de São Paulo, 468p.
Nelson, Joseph, S. (2006). Fishes of the World. John Wiley & Sons, Inc. ISBN 0-471-25031-7.; Buckup P.A.: "Relationships of the Characidiinae and phylogeny of characiform fishes (Teleostei: Ostariophysi)", Phylogeny and Classification of Neotropical Fishes, L.R. Malabarba, R.E. Reis, R.P. Vari, Z.M. Lucena, eds. (Porto Alegre: Edipucr) 1998:123-144.
Planquette, P., P. Keith and P.-Y. Le Bail, 1996. Atlas des poissons d'eau douce de Guyane. Tome 1. Collection du Patrimoine Naturel Volume 22, MNHN, Paris & INRA, Paris. 429 p.
Robins, C.R., R.M. Bailey, C.E. Bond, J.R. Brooker, E.A. Lachner, R.N. Lea and W.B. Scott, 1991. World fishes important to North Americans. Exclusive of species from the continental waters of the United States and Canada. Am. Fish. Soc. Spec. Publ. (21):243 p.
Weitzman, M. and S.H. Weitzman, 2003. Lebiasinidae (Pencil fishes). p. 241-251. In R.E. Reis, S.O. Kullander and C.J. Ferraris, Jr. (eds.) Checklist of the Freshwater Fishes of South and Central America. Porto Alegre: EDIPUCRS, Brasil.
Weitzman, S.H. and L. Palmer, 1997. A new species of Hyphessobrycon (Teleostei: Characidae) from Neblina region of Venezuela and Brazil, with comments on the putative 'rosy tetra clade'. Ichthyol. Explor. Freshwat. 7(3/4):209-242.
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