Groenlandia densa
(L.) Fourr. · speciesAt a glance
Sources10 archives
Databases and archives Groenlandia densa's data was compiled from.
WikipediaWikimedia Foundation9 languages↗
BioWikiNetmultilingual Wikipediamultilingual↗
GBIFGlobal Biodiversity Information Facility18 945 records↗
ENAEuropean Nucleotide Archive · EMBL-EBI12 eDNA detections↗
BOLD SystemsCentre for Biodiversity Genomics20 specimens↗
NCBIUS National Library of Medicinesequences↗
Open Tree of LifeOpenTreephylogeny backbone↗
CCDBChromosome Counts DB · Tel Aviv U.genome & karyotype↗
PloiDBPloidy Databasegenome & karyotype
WikidataWikimedia Foundationstructured facts↗Every layer below draws on the sources above — open one to explore it, or use ← → to move between tabs.
Groenlandia is a monotypic genus of aquatic plants (pondweed) of the family Potamogetonaceae. The only species in the genus is Groenlandia densa. Opposite-leaved pondweed is a common name for this plant. It is native to much of Europe, western Asia and Maghreb in Africa; despite its name it is not found in Greenland.
No narrative description available for this taxon yet.
Size & morphology10
Life cycle & reproduction14
Diet & foraging2
Habitat & environment8
Physiology & chemistry6
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 Groenlandia densa 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 Groenlandia densa 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.
Genome sizehow big the whole instruction manual is
Measured in base pairs (bp) — the individual letters of DNA (human ≈ 3.2 Gb, a bacterium a few million). The chart places this genome on a logarithmic scale — each step to the right is ten times bigger — among reference organisms. Across species a bigger genome loosely tracks with larger cells, slower growth and lower-energy lifestyles (powered flight favours small genomes) — yet it does not imply more genes or a more advanced organism (the long-standing C-value paradox).
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 308×CCDB · slov-fl · CCDB · nw-europe-fl · CCDB · ipcn-api-dl +2
2n 123×CCDB · ita-fl · CCDB · ipcn-api-dl · CCDB · CromoCat 2015
polyploid inferred1×PloiDB · family-scale
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 type18 945 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.
Cultivated / Captivenot free-living
A living individual in a botanical garden, zoo or nursery — cultivated or kept, not free-living.
Wildobservation + sensor
Human sightings and records, or camera-trap / sensor detections — someone (or a device) saw or captured the species in the wild.
Holding institutions36 of 82 geolocated
Institutions and collections holding physical, vouchered specimens of this species — click a row to fly to it on the map.
| Institution | Specimens |
|---|---|
| Mlocation not on record | 237 |
| BFLlocation not on record | 185 |
| MAlocation not on record | 100 |
| Brussel, BE | 92 |
| MeiseBGlocation not on record | 79 |
| BIO-UNIPIlocation not on record | 55 |
| Bern, CH | 44 |
| Salzburg, AT | 42 |
| LDlocation not on record | 38 |
| Provincia di Livornolocation not on record | 35 |
| CJBGlocation not on record | 28 |
| Vitoria, ES | 28 |
| València, ES | 27 |
| Barcelona, ES | 26 |
| Entomological Society of Latvialocation not on record | 25 |
| South Kensington, GB | 25 |
| Madrid, ES | 24 |
| BSBIlocation not on record | 23 |
| Wlocation not on record | 18 |
| Museum Ludovicae Ulricae, Zoology Institute of the University of Uppsalalocation not on record | 17 |
| Dresden, DE | 16 |
| BClocation not on record | 11 |
| LfUlocation not on record | 11 |
| DBF-NHMDlocation not on record | 10 |
| Nijmegen, NL | 9 |
| Bourges, FR | 8 |
| Kew, GB | 8 |
| Salamanca, ES | 8 |
| University of Birminghamlocation not on record | 7 |
| PRClocation not on record | 7 |
| Lausanne, CH | 6 |
| Pamplona, ES | 6 |
| Porrentruy, CH | 6 |
| Royal Botanic Garden Edinburghlocation not on record | 5 |
| Oskarshamn, SE | 5 |
| Museo Achille Folettolocation not on record | 5 |
| Berlin, DE | 5 |
| Görlitz, DE | 4 |
| Frauenfeld, CH | 4 |
| Tilburg, NL | 4 |
| No collectionlocation not on record | 4 |
| Auckland, NZ | 4 |
| Universidad del Pais Vasco (UPV/EHU)location not on record | 4 |
| OLAlocation not on record | 4 |
| Naturhistorische Gesellschaft Nürnberg e.V.location not on record | 4 |
| Glarus, CH | 3 |
| UGentlocation not on record | 3 |
| Phyletisches Museum Jenalocation not on record | 3 |
| Sevilla, ES | 3 |
| Staatliches Museum fuer Naturkunde Karlsruhe (State Museum of Natural History)location not on record | 3 |
| Frankfurt am Main | 3 |
| Banyoles, ES | 2 |
| Madrid, ES | 2 |
| Pamplona, ES | 2 |
| Jaén, ES | 2 |
| Institut und Museum fuer Geologie und Palaeontologielocation not on record | 2 |
| San Jose State University, Museum of Birds and Mammalslocation not on record | 2 |
| Sion, CH | 2 |
| Alicante, ES | 2 |
| Podgorica, ME | 2 |
| H-Adlerlocation not on record | 2 |
| Olocation not on record | 2 |
| BRNUlocation not on record | 2 |
| Granada, ES | 2 |
| CICYTEXlocation not on record | 2 |
| Moscow State Universitylocation not on record | 1 |
| BG-NMNHSlocation not on record | 1 |
| Trondheim, NO | 1 |
| PrivatHerblocation not on record | 1 |
| Adam Mickiewicz University in Poznańlocation not on record | 1 |
| Fribourg, CH | 1 |
| National Museum Waleslocation not on record | 1 |
| Taipei, TW | 1 |
| Universität Göttingenlocation not on record | 1 |
| Naturalis Biodiversity Centerlocation not on record | 1 |
| Boumlocation not on record | 1 |
| CJBNlocation not on record | 1 |
| NMBU:MINAlocation not on record | 1 |
| Department of Bacteriology, University of Wisconsinlocation not on record | 1 |
| NoColllocation not on record | 1 |
| GJOlocation not on record | 1 |
| Museo civico di Storia naturale Giacomo Doria di Genova | Giacomo Doria Natural History Museum in Genoalocation not on record | 1 |
Cultivated / Captivenot free-living
A living individual in a botanical garden, zoo or nursery — cultivated or kept, not free-living.
Where the DNA of Groenlandia densa 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.