Eigenmannia virescens
(Valenciennes, 1836) · speciesAt a glance
Sources10 archives
Databases and archives Eigenmannia virescens's data was compiled from.
WikipediaWikimedia Foundation5 languages↗
BioWikiNetmultilingual Wikipediamultilingual↗
GBIFGlobal Biodiversity Information Facility4 433 records↗
ENAEuropean Nucleotide Archive · EMBL-EBI44 eDNA detections↗
BOLD SystemsCentre for Biodiversity Genomics46 specimens↗
Open Tree of LifeOpenTreephylogeny backbone↗
GoaTGenomes on a Tree · Sangergenome & karyotype↗
Tree of SexTree of Sex Consortiumgenome & karyotype↗
Catalogue of LifeCOLtaxonomy↗
GLoBIGlobal Biotic Interactionsbiotic interactions↗Every layer below draws on the sources above — open one to explore it, or use ← → to move between tabs.
The glass knifefish (Eigenmannia virescens) is a weakly electric freshwater fish found across South America. It is marketed as an aquarium fish.
No narrative description available for this taxon yet.
Size & morphology2
Habitat & environment2
Uses & economy1
Other traits1
A DNA barcode is a short, standardised stretch of genes that works like a fingerprint — enough to tell one species from another. Below is the molecular trace Eigenmannia virescens has left across the world's sequence archives.
At a glance
★ the standard DNA barcode for this group — the short region actually read to tell this species apart. The rest are extra genes sequenced along the way.
The complete instruction manual Eigenmannia virescens carries — its genome. We read it from three angles — how big it is, how the DNA is packed into chromosomes, and how completely it has been sequenced — and explain how to read each value as you go.
Chromosomes & ploidyhow the DNA is packaged
2n is the full chromosome count in a normal body cell; n is a gamete (egg or sperm), which carries half. Ploidy is how many complete chromosome sets each cell holds — 2× (diploid) is typical for animals, while higher levels (polyploidy) are common in plants. Click any value below to see the underlying records and sources.
2n 384×GoaT · Animal Chromosome Counts Database · GoaT · Tree of Sex Database · TreeOfSex · vert
How far back this lineage goes — and how we know. Everything here is measured in Ma, short for “mega-annum”: millions of years ago. The chart reads left to right like a calendar of the Earth, from the deep past on the left to today at the right edgetop to bottom like a core drilled through the Earth, from the deep past at the top down to today at the bottom.
At a glance
When this lineage existed
How to read this: the coloured strip along the bottomdown the left is the geological calendar — the standard epochs (Pliocene, Pleistocene…) every museum uses, shown so you can see which chapter of Earth's history this lineage lived in. This lineage is a young one, so the strip is zoomed in to epochs — the finer subdivisions inside a period. The orange marker is the DNA clock: DNA accumulates mutations at a roughly steady rate, so comparing this species' DNA with its relatives estimates when the lineage split off — independently of any fossil.
Record type4 433 records
Origin
Range
Wildobservation + sensor
Human sightings and records, or camera-trap / sensor detections — someone (or a device) saw or captured the species in the wild.
Museum / Voucheredphysical evidence
Backed by a physical specimen — a herbarium sheet, sample or voucher held in a collection. “Vouchered” means supported by material evidence, not just an observation.
Wildobservation + sensor
Human sightings and records, or camera-trap / sensor detections — someone (or a device) saw or captured the species in the wild.
Holding institutions18 of 54 geolocated
Institutions and collections holding physical, vouchered specimens of this species — click a row to fly to it on the map.
| Institution | Specimens |
|---|---|
| Instituto de Biodiversidad de Venezuela - INBIOlocation not on record | 275 |
| Chicago, US | 133 |
| Museu de Zoologia da Universidade de Sao Paulolocation not on record | 101 |
| Instituto de Investigación de Recursos Biológicos Alexander von Humboldt (IAvH)location not on record | 87 |
| Pontificia Universidad Javeriana (PUJ)location not on record | 83 |
| University of Nebraskalocation not on record | 82 |
| USP-RPlocation not on record | 75 |
| Universidad del Tolima (UT)location not on record | 72 |
| Champaign, US | 69 |
| UEMlocation not on record | 63 |
| CASlocation not on record | 62 |
| PUC-RSlocation not on record | 54 |
| Montgomery, US | 51 |
| Washington, US | 44 |
| Florida Museum of Natural History- Zoology, Paleontology & Paleobotanylocation not on record | 41 |
| Museu Nacional/Universidade Federal do Rio de Janeirolocation not on record | 36 |
| Ann Arbor, US | 33 |
| Universidad Católica de Oriente (UCO)location not on record | 32 |
| Geneva, CH | 32 |
| Cambridge, US | 31 |
| Londrina, BR | 31 |
| Toronto, CA | 29 |
| Texas Memorial Museum, Texas Natural History Collectionlocation not on record | 26 |
| Instituto Nacional de Pesquisas da Amazônia (INPA)location not on record | 25 |
| Stockholm, SE | 24 |
| Universidad de los Llanos (UniLlanos)location not on record | 23 |
| Paris, FR | 20 |
| Universidad de la Amazonia (UniAmazonia)location not on record | 18 |
| Museu Paraense Emílio Goeldilocation not on record | 18 |
| MPSlocation not on record | 17 |
| FishBaselocation not on record | 16 |
| Texas Cooperative Wildlife Collectionlocation not on record | 16 |
| 15 | |
| UFRRJlocation not on record | 12 |
| INMAlocation not on record | 12 |
| UFMSlocation not on record | 11 |
| Los Angeles, US | 9 |
| Instituto para la Investigación y la Preservación del Patrimonio Cultural y Natural del Valle del Cauca - INCIVAlocation not on record | 7 |
| Barcelona, ES | 6 |
| Fundacion Miguel Lillolocation not on record | 5 |
| Universidad de Caldas (UCaldas)location not on record | 4 |
| UNICAMPlocation not on record | 4 |
| South Kensington, GB | 3 |
| University, National Zoological Collection of Surinamelocation not on record | 3 |
| Universidad Industrial de Santander (UIS)location not on record | 2 |
| SNSB-Zoologische Staatssammlung Münchenlocation not on record | 2 |
| IAvHlocation not on record | 2 |
| Louisiana State University, Museum of Zoologylocation not on record | 2 |
| Universidad El Bosque (El Bosque)location not on record | 2 |
| New Haven, US | 1 |
| Universidad Tecnológica del Chocó (UTCH)location not on record | 1 |
| Vancouver, CA | 1 |
| Frankfurt am Main | 1 |
| Universidad de La Salle (La Salle)location not on record | 1 |
Where the DNA of Eigenmannia virescens was picked up in samples of water, soil or air — nobody saw the organism, only its DNA left behind. A trace is a clue that the species was near, not a confirmed sighting.
Signal
Where its DNA was found
How strong is each trace?
Modelled climatemodelled
How to read this: each dot is one detection of this species' DNA in an environmental sample. The confidence meter weighs how many independent studies and places back up the signal — one detection in one study is a hint; many across several studies is solid. Records dated before 2008 (when eDNA methods began) are treated as likely mislabeled and left off the map.