| 词条 | Cyanogaster noctivaga |
| 释义 |
| name = | status = NE | status_system = IUCN3.1 | image = | regnum = Animalia | phylum = Chordata | classis = Actinopterygii | ordo = Characiformes | familia = Characidae | subfamilia = Stevardiinae | genus = Cyanogaster | genus_authority = Mattox, Britz, Toledo-Piza & Marinho, 2013 | species = C. noctivaga | binomial = Cyanogaster noctivaga | binomial_authority = Mattox, Britz, Toledo-Piza & Marinho, 2013 }}Cyanogaster noctivaga is a species of characin native to the Rio Negro, Brazil.[1] This species is the only known member of its genus and its scientific name translates as the blue-bellied night wanderer, referring to its unique appearance and nocturnal habits.[2] It was first described in 2013, having been discovered in October 2011 on a scientific expedition organised by the University of São Paulo, Brazil.[3] DescriptionWhen alive, Cyanogaster noctivaga is a transparent fish with a blue belly and reddish gill covers, but it quickly loses its bright colours after death. Its eyes are large, and the shape of its snout and its dentition differs from other characins, marking it out as a new genus. The longest specimen found was {{convert|17.4|mm|2|abbr=on}} long.[2] It differs from other members of the subfamily Stevardiinae in having 8 dorsal-fin rays and four teeth in the inner premaxillary tooth series and i+5 pelvic-fin rays and the presence of a single conical tooth in the outer premaxillary tooth series. There are hooks on the rays of the pelvic and anal fins in mature males.[2] Distribution and habitatThis fish is only known from a single location in the Rio Negro, but as it is a very small fish and seems to be entirely nocturnal, it is easily overlooked. It was found in an acidic backwater, a similar habitat to that of the smallest known species of fish, Paedocypris progenetica, which occurs in peaty forest swamps and blackwater streams in Asia.[3][4] References1. ^Thomaz, A.T., Arcila, D., Ortí, G. & Malabarba, L.R. (2015): Molecular phylogeny of the subfamily Stevardiinae Gill, 1858 (Characiformes: Characidae): classification and the evolution of reproductive traits. BMC Evolutionary Biology, (2015) 15: 146. {{Characiformes-stub}}2. ^1 {{cite journal | authors = Mattox, G.M.T., Britz, R., Toledo-Piza, M. & Marinho, M.M.F. | year = 2013 | title = Cyanogaster noctivaga, a remarkable new genus and species of miniature fish from the Rio Negro, Amazon basin (Ostariophysi: Characidae) | journal = Ichthyological Exploration of Freshwaters | volume = 23 | issue = 4 | pages = 297–318 | url = http://www.bv.fapesp.br/en/publicacao/72744/cyanogaster-noctivaga-a-remarkable-new-genus-and-species-of-/ }} 3. ^1 2 {{cite web | url = http://www.nhm.ac.uk/about-us/news/2013/march/blue-bellied-fish-is-a-surprise-catch119960.html | title = Blue-bellied fish is a surprise catch | authors = Da Silva, Y. | date = 2013 | publisher = Natural History Museum }} 4. ^{{cite journal | authors = Kottelat, M., Britz, R., Tan, H.H. & Witte, K.-E. | year = 2005 | title = Paedocypris, a new genus of Southeast Asian cyprinid fish with a remarkable sexual dimorphism, comprises the world's smallest vertebrate | journal = Proceedings of the Royal Society B: Biological Sciences | volume = 273 | pages = 895–899 | url = http://www.eurocean.org/np4/file/133/Paedocypris_20__20the_20world_20s_20smal.pdf }} 3 : Characidae|Monotypic fish genera|Fish described in 2013 |
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