Crocodylus acutus
(Cuvier, 1807) · speciesAt a glance
Sources11 archives
Databases and archives Crocodylus acutus's data was compiled from.
WikipediaWikimedia Foundation19 languages↗
BioWikiNetmultilingual Wikipediamultilingual↗
GBIFGlobal Biodiversity Information Facility11 549 records↗
OBISOcean Biodiversity Information System2 records↗
ENAEuropean Nucleotide Archive · EMBL-EBI143 eDNA detections↗
BOLD SystemsCentre for Biodiversity Genomics149 specimens↗
Open Tree of LifeOpenTreephylogeny backbone↗
GoaTGenomes on a Tree · Sangergenome & karyotype↗
Paleobiology DatabasePBDB consortiumfossil record↗
WikidataWikimedia Foundationstructured facts↗
GLoBIGlobal Biotic Interactionsbiotic interactions↗Every layer below draws on the sources above — open one to explore it, or use ← → to move between tabs.
The American crocodile (Crocodylus acutus) is a species of crocodilian found in the Neotropics. It is the most widespread of the four extant species of crocodiles from the Americas, with populations present from South Florida and the coasts of Mexico to as far south as Peru and Venezuela. The habitat of the American crocodile consists largely of coastal areas. It is also found in river systems, but tends to prefer salinity, resulting in the species congregating in brackish lakes, mangrove swamps, lagoons, cays, and small islands. Other crocodiles also have tolerance to saltwater due to salt glands underneath the tongue, but the American crocodile is the only species other than the saltwater crocodile to commonly live and thrive in saltwater. They can be found on beaches and small island formations without any freshwater source, such as many cays and islets across the Caribbean. They are also found in hypersaline lakes; one of the largest known populations inhabits Lago Enriquillo in the Dominican Republic. The American crocodile is one of the largest crocodile species. Males can reach lengths of 6.1 m, weighing up to 907 kg. On average, mature males are more in the range of 2.9 to in length weighing up to about 400 kg. As with other crocodile species, females are smaller, rarely exceeding 3.8 m in length even in the largest-bodied population. Like any other large crocodilian, the American crocodile is potentially dangerous to humans, but it tends not to be as aggressive as some other species. American crocodiles coexist with the American alligator in Florida, and with the smaller spectacled caiman within Central America.
No narrative description available for this taxon yet.
Size & morphology2
Life cycle & reproduction8
Habitat & environment3
Other traits2
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 Crocodylus acutus 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.
Besides the big genome in the nucleus, cells carry a small, circular loop of DNA inside the cell's energy factories — the mitochondria. It is inherited almost only from the mother and is a leftover from ancient bacteria that moved into the cell. The mitochondrial markers above (ND*, COX, CYTB…) are read from exactly this loop. Outer ring = one strand, inner ring = the other.
The complete instruction manual Crocodylus acutus 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 321×GoaT · Animal Chromosome Counts Database
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 solid bar is the fossil range: the span between the oldest and the youngest fossil that palaeontologists have assigned to Crocodylus acutus. Above itBeside it, each dot is one dated fossil find — few enough to count, so they are drawn individually rather than as a graph. 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.
The two clocks disagree here. The fossil record reaches back to 4.7 Ma, but the molecular clock dates the lineage to only 1.29 Ma — about 3.41 Myr younger. A fossil cannot be older than the lineage it belongs to, so one of the two is off: either the fossil is assigned to the wrong species, or the clock is running fast.
How it livedPBDB
Record type11 553 records
Origin
Range
Depth
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 institutions19 of 27 geolocated
Institutions and collections holding physical, vouchered specimens of this species — click a row to fly to it on the map.
| Institution | Specimens |
|---|---|
| Florida Museum of Natural History- Zoology, Paleontology & Paleobotanylocation not on record | 75 |
| Cambridge, US | 50 |
| Ann Arbor, US | 32 |
| Washington, US | 25 |
| Los Angeles, US | 22 |
| New Haven, US | 19 |
| Berkeley, US | 17 |
| Tapachula, MX | 17 |
| Mexico City, MX | 6 |
| 6 | |
| CASlocation not on record | 5 |
| 5 | |
| South Kensington, GB | 5 |
| Chongqing Museumlocation not on record | 5 |
| San Diego, US | 4 |
| Chicago, US | 3 |
| Tacoma, US | 2 |
| Stockholm, SE | 2 |
| Mexico City, MX | 2 |
| Tuxtla Gutiérrez, MX | 2 |
| Universidad Industrial de Santander (UIS)location not on record | 2 |
| Museo civico La Terra e l'Uomo di Crocetta del Montellolocation not on record | 1 |
| Universidad de Caldas (UCaldas)location not on record | 1 |
| Wuzhou, CN | 1 |
| Seattle, US | 1 |
| Universidad de La Salle (La Salle)location not on record | 1 |
| Museo de Historia Natural “Gustavo Orcés V"location not on record | 1 |
Where the DNA of Crocodylus acutus 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.