Every layer below draws on the sources above — open one to explore it, or use ← → to move between tabs.
NarrativeWikipediaarticle
Occurrence & distributionGBIF350 records
01Narrative
The red-bellied racer (Alsophis rufiventris) is a species of Colubrid snake that is endemic to the Lesser Antilles in the Caribbean, where it is found on the islands of Saba, Sint Eustatius, Saint Kitts, and Nevis. Males have black-bordered blotches that transition into a dark mid-dorsal stripe towards the posterior. Females have a series of middorsal streaks and smudges that fade towards the posterior. Other common names include the Saba racer and the orange-bellied racer.
No narrative description available for this taxon yet.
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
DNA clock origin1.73 Ma TimeTree
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.
DNA clock origin
08Occurrence & distribution
Record type350 records
Wild obs. + sensor315
Museum / vouchered35
Range
Area of Occupancy AOO272 km²
Wildobservation + sensor
Human sightings and records, or camera-trap / sensor detections — someone (or a device) saw or captured the species in the wild.
Coordinate accuracy76% within 1 km
≤100 m 214≤1 km 12≤10 km 1>10 km 71
298 georeferenced · 17 without coordinates
Open the mapobservation + sensor315
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.
Coordinate accuracy7% within 1 km
≤1 km 2≤10 km 19>10 km 8
29 georeferenced · 6 without coordinates
Open the institutions mapphysical evidence35
Wildobservation + sensor
Human sightings and records, or camera-trap / sensor detections — someone (or a device) saw or captured the species in the wild.
10Collections & institutions
Holding institutions3 of 4 geolocated
Institutions and collections holding physical, vouchered specimens of this species — click a row to fly to it on the map.
