Celebes Black-Tailed Ratsnake
Gonyosoma jansenii
- KingdomAnimalia (Animals)
- PhylumChordata (Chordates)
- ClassSquamata
- FamilyColubridae (Colubrid Snakes)
- GenusGonyosoma (Redtail Rat Snakes)
- SpeciesGonyosoma jansenii (Celebes Black-Tailed Ratsnake)
About the Celebes Black-Tailed Ratsnake
Gonyosoma jansenii, commonly known as the Celebes black-tailed rat snake, the Celebes ratsnake, and Jansen's rat snake, is a species of snake in the subfamily Colubrinae of the family Colubridae. The species is endemic to the Indonesian island of Sulawesi.
The specific name, jansenii, is in honor of Albert Jacques Frédéric Jansen, who was an administrator in the Dutch East Indies. The preferred natural habitat of G. jansenii, is forest, at altitudes from sea level to 1,000 m (3,300 ft).
A long snake, G. jansenii may attain a total length of 199 cm (6.53 ft), which includes a tail length of 45 cm (1.48 ft). Adults are olive or yellowish brown on the anterior and middle portions of the body, with some scales black-edged. They are entirely black on the posterior portion of the body and tail (Boulenger, 1894).
G. jansenii is semi-arboreal. G. jansenii is oviparous. Bleeker P (1858). "Gonyosoma Jansenii Blkr, eene nieuwe slang van Manado". Natuurkundig Tijdschrift voor Nederlandsch Indië 16: 242. (Gonyosoma jansenii, new species, p. 242). (in Dutch).
Boulenger GA (1894... Wikipedia →
Closest Relatives at Tangkoko Nature Reserve
Global Distribution
Where this species is recorded worldwide. Restricted to human observations from 2019 onwards — the same kind of record and the same period the probabilities on this page are built from, so collar-tracking studies, camera-trap arrays and museum specimens are excluded. Around Santa Rosa that removes 5,924 GPS fixes from a handful of tagged jaguars.
where this species is recorded (GBIF density — it tracks where observers go, not how likely a sighting is) · parks where it occurs — tap a pin for the sighting probability there
Parks Where Found
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Tangkoko Nature Reserve | 🇮🇩 Indonesia |
More parks will be added in future updates.
Quick answers
What are the chances of seeing a Celebes Black-Tailed Ratsnake in Tangkoko Nature Reserve?
About 20% of wildlife watchers report a Celebes Black-Tailed Ratsnake sighting in Tangkoko Nature Reserve, based on 10 verified sightings from GBIF citizen-science data.
When is the best time to see Celebes Black-Tailed Ratsnake in Tangkoko Nature Reserve?
October has the highest sighting rate for Celebes Black-Tailed Ratsnake in Tangkoko Nature Reserve in our monthly data.