Balea perversa, also known as the wall snail or tree snail, is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Clausiliidae, the door snails. The shell of this species is left-handed in coiling and it looks like a juvenile of a clausiliid. Balea perversa (as its synonymous name Pupa fragilis) is the type species of the genus Balea.
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 Balea perversa has left across the world's sequence archives.
At a glance
DNA specimens22
BINs2
Marker genes1
eDNA detections16
Countries5
The DNA barcodethe species' typical barcode, built from every sequenced specimen
COI-5P640 bp consensus18 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. 85% of positions are identical in every specimen.
Where individuals differ — all 93 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)6.1%
Haplotypes4
BIN1
Most divergent pair2.3%
Europe
Closest relatives by DNA barcode
The species whose COI barcode is most similar to this one — a quick “who is this most like”. The percentage is how much the barcode differs; it approximates, but is not, the full evolutionary tree.
★ 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-5P
animal barcode
08Occurrence & distribution
Record type6 801 records
Wild obs. + sensor3 715
Museum / vouchered3 069
Fossil1
Other16
Origin
Native734
Range
Area of Occupancy AOO15 528 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 accuracy28% within 1 km
≤100 m 764≤1 km 238≤10 km 2 483>10 km 82
3 567 georeferenced · 148 without coordinates
Open the mapobservation + sensor3 715
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 accuracy27% within 1 km
≤100 m 46≤1 km 294≤10 km 854>10 km 75
1 269 georeferenced · 1 800 without coordinates
Open the institutions mapphysical evidence3 069
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 institutions24 of 51 geolocated
Institutions and collections holding physical, vouchered specimens of this species — click a row to fly to it on the map.
Institution
Specimens
Gothenburg, SE
1 477
Paro, BT
230
Adam Mickiewicz University in Poznańlocation not on record
182
Bern, CH
178
Helsinki, FI
151
Provincia di Livornolocation not on record
105
Universität Zürich, Naturhistorisches Museumlocation not on record
42
Cambridge, US
39
Barcelona, ES
36
Frankfurt am Main
24
Philadelphia, US
21
BioFokuslocation not on record
18
Natural History Museum Rotterdamlocation not on record
18
NTNU-VMlocation not on record
17
MZLUlocation not on record
13
Paris, FR
11
Dhaka, BD
11
Sion, CH
9
Geneva, CH
8
Salzburg, AT
8
CBDClocation not on record
7
SLU Artdatabankenlocation not on record
6
Delaware Museum of Nature and Sciencelocation not on record
6
SNSDlocation not on record
6
Stockholm, SE
5
Brussels, BE
5
John May Museum of Natural Historylocation not on record
5
RBINS-Scientific Heritagelocation not on record
5
Chongqing Museumlocation not on record
4
Muzeum i Instytut Zoologii Polskiej Akademii Nauklocation not on record
4
Winterthur, CH
4
HNClocation not on record
4
Kuopio, FI
4
Tromsø, NO
4
Ann Arbor, US
3
Champaign, US
3
Museo Enrico Pirajno di Mandralisca | Enrico Pirajno di Mandralisca Museumlocation not on record
3
Metsähallituslocation not on record
3
Museo civico di Storia naturale Giacomo Doria di Genova | Giacomo Doria Natural History Museum in Genoalocation not on record
2
EVMGlocation not on record
2
Naturéum — Muséum cantonal des sciences naturelles, Lausanne, Département Zoologielocation not on record
2
Denver, US
2
ZSMlocation not on record
2
Musee d'Histoire Naturallelocation not on record
2
Museo civico La Terra e l'Uomo di Crocetta del Montellolocation not on record
2
Frauenfeld, CH
2
Saint John, CA
1
Bavarian State Collection of Zoologylocation not on record
1
Toronto, CA
1
Muséum d'Histoire naturelle de Grenoblelocation not on record
1
Paleontological Research Institutionlocation not on record
1
51 institutions · 2 700 of 3 069 vouchered records shown · 369 without an institution code
09Environmental DNA16 detections
Where the DNA of Balea perversa 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 found16
Studies independent surveys1
Countries4
Signal confidence: weakweighed across independent studies, places & mapped detections
Where its DNA was found
0 of 16 detections have coordinates
Open the map4 countries0
under stonesHetraieBord de riviere et de sourceRipisylve a aulne
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 median14.7 °C 6.50–18.6
Seasonal swing summer↔winter16.6 °C
Max temp (day)19.0 °C 8.60–23.4
Min temp (night)9.80 °C 4.20–13.2
Precipitation51.9 mm/mo 33.9–104
Air humidity57.0 % 54.2–64.1
Moisture balance-49.7 mm/mo -119–50.4
Vapour deficit680 Pa 396–981
Wind speed2.10 m/s 1.30–6.00
Cloud cover42.9 % 35.7–50.1
CHELSA 1981–2010, ~9 km grid, at location & month of 14 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 Foundation4 languages↗
BioWikiNetmultilingual Wikipediamultilingual↗
GBIFGlobal Biodiversity Information Facility6 801 records↗
ENAEuropean Nucleotide Archive · EMBL-EBI16 eDNA detections↗
BOLD SystemsCentre for Biodiversity Genomics22 specimens↗
Open Tree of LifeOpenTreephylogeny backbone↗
WikidataWikimedia Foundationstructured facts↗
Catalogue of LifeCOLtaxonomy↗
GLoBIGlobal Biotic Interactionsbiotic interactions↗