Cassidula nucleus

(Gmelin, 1791) · species

image placeholder — illustration coming later

Animalia/Mollusca/Gastropoda/Ellobiida/Ellobiidae/Cassidula

At a glance

Occurrence records355

Data sources9

Biological traits2

DNA specimens16

eDNA detections7

Sources9 archives

Databases and archives Cassidula nucleus's data was compiled from.

WikipediaWikimedia Foundation2 languages↗

BioWikiNetmultilingual Wikipediamultilingual↗

GBIFGlobal Biodiversity Information Facility215 records↗

OBISOcean Biodiversity Information System140 records↗

ENAEuropean Nucleotide Archive · EMBL-EBI7 eDNA detections↗

BOLD SystemsCentre for Biodiversity Genomics16 specimens↗

Paleobiology DatabasePBDB consortiumfossil record↗

Catalogue of LifeCOLtaxonomy↗

GLoBIGlobal Biotic Interactionsbiotic interactions↗

On this page5 sections

Every layer below draws on the sources above — open one to explore it, or use ← → to move between tabs.

NarrativeWikipediaarticle

Traits & measurements1 literature sources2 traits

Occurrence & distributionGBIF · OBIS355 records

Environmental DNA1 datasets · 1 countries7 detections

DNA & barcodingBOLD16 specimens

01Narrative

Cassidula nucleus is a species of air-breathing marine snail, a pulmonate gastropod mollusk in the family Ellobiidae.

No narrative description available for this taxon yet.

02Traits & measurements

SourcesSeaLifeBase

Habitat & environment2

Habitat saltwateryes

Habitat zonebenthic

05DNA & barcoding16 specimens

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 Cassidula nucleus has left across the world's sequence archives.

At a glance

DNA specimens16

BINs5

Marker genes2

eDNA detections7

Countries1

The DNA barcodethe species' typical barcode, built from every sequenced specimen

COI-5P654 bp consensus15 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. 80% of positions are identical in every specimen.

Where individuals differ — all 134 variable positions, in barcode order

1Cvariable

2Tvariable

3Gvariable

4Tvariable

5Avariable

6Tvariable

7Avariable

8Tvariable

9Gvariable

10Gvariable

13Tvariable

15Cvariable

16Gvariable

17Gvariable

18Avariable

20Tvariable

21Tvariable

22Tvariable

23Gvariable

24Avariable

27Tvariable

28Gvariable

30Gvariable

31Tvariable

32Tvariable

33Avariable

34Gvariable

36Gvariable

38Gvariable

39Avariable

40Avariable

41Cvariable

43Gvariable

44Gvariable

45Cvariable

46Cvariable

47Tvariable

49Tvariable

50Cvariable

51Avariable

52Cvariable

53Tvariable

57Tvariable

58Avariable

61Cvariable

62Gvariable

63Avariable

64Tvariable

65Tvariable

66Cvariable

67Gvariable

68Avariable

69Gvariable

70Cvariable

71Tvariable

72Avariable

73Gvariable

74Gvariable

75Tvariable

76Avariable

77Cvariable

78Avariable

79Gvariable

81Tvariable

83Gvariable

84Gvariable

85Avariable

86Avariable

87Tvariable

88Cvariable

89Tvariable

91Tvariable

93Avariable

99Cvariable

111Tmostly conserved

117Tmostly conserved

123Tmostly conserved

150Tmostly conserved

162Gmostly conserved

165Tvariable

177Gmostly conserved

180Avariable

189Tmostly conserved

192Avariable

195Amostly conserved

202Tmostly conserved

204Gmostly conserved

219Cmostly conserved

231Cmostly conserved

234Cmostly conserved

270Cmostly conserved

273Amostly conserved

279Cmostly conserved

283Cvariable

291Cmostly conserved

296Gmostly conserved

297Cmostly conserved

306Amostly conserved

309Gmostly conserved

312Gmostly conserved

315Avariable

324Amostly conserved

327Gvariable

330Gvariable

333Cmostly conserved

342Tmostly conserved

345Amostly conserved

347Gmostly conserved

351Gmostly conserved

354Cmostly conserved

381Cvariable

382Cmostly conserved

397Cmostly conserved

399Gmostly conserved

403Cmostly conserved

405Gmostly conserved

408Cmostly conserved

414Gmostly conserved

417Avariable

426Amostly conserved

+14 more variable positions not shown

CTGTATATGGTGTTCGGAGTTTGATGTGGGTTAGTGGGAACAGGCCTCTCACTACTTATTCGATTCGAGCTAGGTACAGCTGGGAATCTT …

Variant network

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)8.3%

Haplotypes5

BINs5

Most divergent pair4.7%

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

08Occurrence & distribution

Record type355 records

Wild obs. + sensor17

Museum / vouchered336

Other2

Range

Area of Occupancy AOO728 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 accuracy100% within 1 km

≤100 m 6

6 georeferenced · 11 without coordinates

Open the mapobservation + sensor17

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 accuracy56% within 1 km

≤100 m 3≤1 km 99≤10 km 60>10 km 19

181 georeferenced · 155 without coordinates

Open the institutions mapphysical evidence336

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 institutions10 of 23 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	84
Philadelphia, US	30
Paris, FR	21
Museum and Art Gallery of the Northern Territorylocation not on record	12
Cambridge, US	10
Ann Arbor, US	9
Natural History Museum Rotterdamlocation not on record	5
Wakayama Prefectural Museum of Natural Historylocation not on record	4
Washington, US	3
Champaign, US	3
Denver, US	2
Florida Museum of Natural History- Zoology, Paleontology & Paleobotanylocation not on record	2
Natick, US	2
Chongqing Museumlocation not on record	2
North Carolina Museum of Natural Scienceslocation not on record	2
Brussels, BE	2
Paleontological Research Institutionlocation not on record	2
Muzeum i Instytut Zoologii Polskiej Akademii Nauklocation not on record	2
Provincia di Livornolocation not on record	1
Santa Barbara Museum of Natural Historylocation not on record	1
Museums Victorialocation not on record	1
Delaware Museum of Nature and Sciencelocation not on record	1
Tasmanian Museum & Art Gallerylocation not on record	1

23 institutions · 202 of 336 vouchered records shown · 3 without an institution code

09Environmental DNA7 detections

Where the DNA of Cassidula nucleus 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 found7

Studies independent surveys1

Countries1

Signal confidence: weakweighed across independent studies, places & mapped detections

Where its DNA was found

0 of 7 detections have coordinates

Open the map1 country0

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 median26.6 °C 26.6–26.6

Seasonal swing summer↔winter2.60 °C

Max temp (day)28.4 °C

Min temp (night)25.0 °C

Precipitation275 mm/mo

Air humidity66.6 %

Moisture balance111 mm/mo

Vapour deficit1,161 Pa

Wind speed2.10 m/s

Cloud cover62.7 %

CHELSA 1981–2010, ~9 km grid, at location & month of 3 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.

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