Bradybaena similaris, the Asian trampsnail, is a species of small, invasive land snail. It is a pulmonate gastropod terrestrial mollusc in the family Bradybaenidae. It earned the common name based on its origins, and its habit of roosting on freight containers . This habit means that this may be one of the most broadly-distributed species of terrestrial snail in the world. Bradybaena similaris is the type species of the genus Bradybaena.
No narrative description available for this taxon yet.
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 Bradybaena similaris has left across the world's sequence archives.
At a glance
DNA specimens61
BINs5
Marker genes2
eDNA detections68
Countries7
The DNA barcodethe species' typical barcode, built from every sequenced specimen
COI-5P522 bp consensus59 specimens
ACGT
▸ drag or hover over the strip to read any position — letter and how much it varies
Violet ticks below the strip = positions where individuals differ; flat = the species' unchanging signature. 87% of positions are identical in every specimen.
Where individuals differ — all 70 variable positions, in barcode order
Each circle is a barcode variant; bigger = more specimens, colour = region. Lines join the most similar variants and the tick marks count the mutations between them — a tight cluster is one “dialect”, a long line a more divergent lineage. Click a circle to list its actual specimens.
Diversity (π)2.9%
Haplotypes22
BINs5
Most divergent pair11.7%
AsiaOther
Marker genes sequenced
★ 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.
★COI-5P18S-5P
animal barcoderibosomal
06Genome at a glanceGoaT · NCBI
The complete instruction manualBradybaena similaris 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
Genome size≈2 289 373 504 bp assembly estimate
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).
BACTERIUM Carsonella ruddii0.00016 Gb
FUNGUS0.04 Gb
INSECT0.25 Gb
THIS GENOME Bradybaena similaris2.29 Gb
HUMAN3.2 Gb
WHEAT17 Gb
FERN Tmesipteris160.45 Gb
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.
Chromosomes2n = 58 n = 29
Chromosome-count records — grouped by value · 2n = full set, n = gamete · click a value for sources & references
Sequencing statusassembly quality — how far to trust these numbers
Assembly level tells you how finished the sequence is — from fragmented contigs, through scaffolds, up to a full chromosome-level assembly. BUSCO % estimates completeness: the share of genes expected to be present that were actually found. These describe the data quality, not the organism.
Assembly levelChromosome
08Occurrence & distribution
Record type10 645 records
Wild obs. + sensor9 424
Museum / vouchered1 111
Other110
Origin
Introduced49
Range
Area of Occupancy AOO21 568 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 accuracy81% within 1 km
≤100 m 4 789≤1 km 1 106≤10 km 587>10 km 821
7 303 georeferenced · 2 121 without coordinates
Open the mapobservation + sensor9 424
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 accuracy66% within 1 km
≤100 m 109≤1 km 128≤10 km 76>10 km 48
361 georeferenced · 750 without coordinates
Open the institutions mapphysical evidence1 111
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 institutions18 of 44 geolocated
Institutions and collections holding physical, vouchered specimens of this species — click a row to fly to it on the map.
Institution
Specimens
Sydney, AU
224
Philadelphia, US
193
Florida Museum of Natural History- Zoology, Paleontology & Paleobotanylocation not on record
91
Chicago, US
80
Toyama, JP
75
Natick, US
65
PUC-RSlocation not on record
45
Delaware Museum of Nature and Sciencelocation not on record
30
Cambridge, US
27
Oiso Municipal Museumlocation not on record
23
Museum and Art Gallery of the Northern Territorylocation not on record
22
Gifu prefectural Museumlocation not on record
20
Chongqing Museumlocation not on record
18
Ann Arbor, US
18
Wellington, NZ
16
Museu Nacional/Universidade Federal do Rio de Janeirolocation not on record
15
Toyohashi Museum Of Natural Historylocation not on record
13
Barcelona, ES
13
Auckland, NZ
12
Honolulu, US
12
KSNHMlocation not on record
8
Tomioka, JP
7
CASlocation not on record
6
Los Angeles, US
6
QVMAGlocation not on record
6
Champaign, US
5
Paleontological Research Institutionlocation not on record
5
Provincia di Livornolocation not on record
5
Natural History Museum Rotterdamlocation not on record
5
Museums Victorialocation not on record
4
North Carolina Museum of Natural Scienceslocation not on record
4
Royal Museum for Central Africalocation not on record
3
Toronto, CA
3
MLSPlocation not on record
2
Museo civico La Terra e l'Uomo di Crocetta del Montellolocation not on record
2
Santa Barbara Museum of Natural Historylocation not on record
2
Denver, US
2
Montgomery, US
1
Sam Noble Oklahoma Museum of Natural Historylocation not on record
1
Wakayama Prefectural Museum of Natural Historylocation not on record
1
Kharazmi Universitylocation not on record
1
EL PASO, US
1
Western Australian Museumlocation not on record
1
Akita Prefectural Museumlocation not on record
1
44 institutions · 1 094 of 1 111 vouchered records shown · 17 without an institution code
09Environmental DNA68 detections
Where the DNA of Bradybaena similaris 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
Detections DNA found68
Studies independent surveys1
Countries2
Signal confidence: weakweighed across independent studies, places & mapped detections
Where its DNA was found
0 of 68 detections have coordinates
Open the map2 countries0
garden and surroundings
How strong is each trace?
DNA read depthRead counts were not reported for this species — the map shows presence only, not how strong each trace was.
Modelled climatemodelled
−15°Ctemperature across detection sites+40°C
Temperature median7.40 °C 5.30–14.3
Seasonal swing summer↔winter25.4 °C
Max temp (day)9.60 °C 7.50–17.1
Min temp (night)3.00 °C 0.9–10.5
Precipitation344 mm/mo 212–371
Air humidity64.9 % 64.9–68.6
Moisture balance263 mm/mo 124–314
Vapour deficit428 Pa 342–551
Wind speed2.90 m/s 1.90–3.10
Cloud cover44.6 % 22.9–44.6
CHELSA 1981–2010, ~9 km grid, at location & month of 5 detection points · median with p10–p90 · reflects where sampling happened, not only the true niche
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.
WikipediaWikimedia Foundation6 languages↗
BioWikiNetmultilingual Wikipediamultilingual↗
GBIFGlobal Biodiversity Information Facility10 645 records↗
ENAEuropean Nucleotide Archive · EMBL-EBI68 eDNA detections↗
BOLD SystemsCentre for Biodiversity Genomics61 specimens↗
Open Tree of LifeOpenTreephylogeny backbone↗
GoaTGenomes on a Tree · Sangergenome & karyotype↗
NCBIUS National Library of Medicinegenome & karyotype↗
GLoBIGlobal Biotic Interactionsbiotic interactions↗