Castanea seguinii, called Seguin chestnut, Seguin's chestnut, or Chinese chinquapin (a name it shares with Castanea henryi), and in , mao li, is a species of chestnut native to southcentral and southeast China.
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 Castanea seguinii has left across the world's sequence archives.
At a glance
DNA specimens7
Marker genes3
GenBank sequences8
eDNA detections5
Countries1
The DNA barcodea real sequence read deposited for this species
★ 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.
★matK1★rbcL5★ITS2
plant barcodefungal barcode
06Genome at a glanceCCDB
The complete instruction manualCastanea seguinii 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.
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 = 24 n = 12
Ploidydiploid inferred
Chromosome-count records — grouped by value · 2n = full set, n = gamete · click a value for sources & references
2n 241×CCDB · ipcn-api-dl
CCDB · ipcn-api-dl — Chen, R. y. 1993. (editor), Chromosome Atlas of Chinese Fruit Trees and Their Close Wild Relatives. Chromosome Atlas Chin. Princ. Econ. Pl. 1.
Ploidy records — measured levels and diploid/polyploid inferences · click for sources
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 origin3.79 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 type1 375 records
Wild obs. + sensor23
Museum / vouchered1 351
Cultivated / captive1
Origin
Introduced1
Range
Area of Occupancy AOO1 452 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 accuracy88% within 1 km
≤100 m 5≤1 km 2>10 km 1
8 georeferenced · 15 without coordinates
Open the mapobservation + sensor23
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 accuracy50% within 1 km
≤1 km 2≤10 km 1>10 km 1
4 georeferenced · 1 347 without coordinates
Open the institutions mapphysical evidence1 351
Cultivated / Captivenot free-living
A living individual in a botanical garden, zoo or nursery — cultivated or kept, not free-living.
Coordinate accuracy0% within 1 km
≤10 km 1
1 georeferenced
Open the mapnot free-living1
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 institutions32 of 68 geolocated
Institutions and collections holding physical, vouchered specimens of this species — click a row to fly to it on the map.
Institution
Specimens
Beijing, CN
347
Nanjing, CN
122
Chengdu, CN
91
Guangzhou, CN
78
Yangling, CN
57
Institute for Agricultural Bacteriology and Fermentation Biologylocation not on record
56
Hangzhou, CN
50
Guilin, CN
36
Shanghai, CN
33
Kunming, CN
33
Siouxland Heritage Museumlocation not on record
29
Nanjing, CN
27
Guangzhou, CN
27
Central China Normal Universitylocation not on record
23
Central China Agricultural Universitylocation not on record
19
Zhengzhou, CN
19
Zhejiang Museum of Natural Historylocation not on record
19
Nanjing, CN
17
Zhejiang Universitylocation not on record
17
Anhui Normal Universitylocation not on record
15
Paris, FR
14
South China Normal Universitylocation not on record
14
Wuhan, CN
13
Guizhou Forestry Schoollocation not on record
12
Chinese Academy of Forestrylocation not on record
10
Guangxi Agricultural Universitylocation not on record
9
WNNUlocation not on record
9
Beijing Normal Universitylocation not on record
9
Nagasaki University - Fisherieslocation not on record
9
Taipei, TW
8
Xinxiang, CN
8
Shanghai, CN
8
Awka, NG
7
Guiyang, CN
7
Peking Universitylocation not on record
7
Changsha, CN
6
Zhuzhou, CN
6
Chengdu, CN
5
Wuhan, CN
5
Jiangxi Agricultural Universitylocation not on record
5
JGSlocation not on record
5
SCAUlocation not on record
4
Xian, CN
4
Tianjin Natural History Museumlocation not on record
4
San Jose State University, Museum of Birds and Mammalslocation not on record
3
LDlocation not on record
3
Jiangxi College of Educationlocation not on record
3
Xiamen, CN
3
Beijing, CN
3
Ischia Marine Centrelocation not on record
2
Jishou Universitylocation not on record
2
Hangzhou Normal Collegelocation not on record
2
Beijing Natural History Museumlocation not on record
2
Seoul, KR
2
Chapel Hill, US
2
Xining, CN
2
Bronx, US
2
Herbarium of South China Botanical Gardenlocation not on record
2
SMMUlocation not on record
2
黔东南州民族医药研究所标本室location not on record
2
J. Rusek Collectionlocation not on record
1
Jiujiang Forestry Institutelocation not on record
1
BJUlocation not on record
1
Nanyue Arboretumlocation not on record
1
Riverside, US
1
“Manash Kozybayev North Kazakhstan University" NPLClocation not on record
1
Guangxi Institute of Traditional Medical and Pharmaceutical Scienceslocation not on record
1
Chongqing Natural History Museumlocation not on record
1
68 institutions · 1 348 of 1 351 vouchered records shown · 3 without an institution code
Cultivated / Captivenot free-living
A living individual in a botanical garden, zoo or nursery — cultivated or kept, not free-living.
09Environmental DNA5 detections
Where the DNA of Castanea seguinii 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 found5
Studies independent surveys1
Countries1
Signal confidence: weakweighed across independent studies, places & mapped detections
Where its DNA was found
0 of 5 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 median25.2 °C 25.2–25.2
Seasonal swing summer↔winter24.8 °C
Max temp (day)28.5 °C
Min temp (night)21.2 °C
Precipitation232 mm/mo
Air humidity64.0 %
Moisture balance114 mm/mo
Vapour deficit1,153 Pa
Wind speed1.70 m/s
Cloud cover41.8 %
CHELSA 1981–2010, ~9 km grid, at location & month of 1 detection point · 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 Foundation7 languages↗
BioWikiNetmultilingual Wikipediamultilingual↗
GBIFGlobal Biodiversity Information Facility1 375 records↗
ENAEuropean Nucleotide Archive · EMBL-EBI5 eDNA detections↗
BOLD SystemsCentre for Biodiversity Genomics7 specimens↗
NCBIUS National Library of Medicinesequences↗
GRIN TaxonomyUSDA-ARSdistribution & uses↗
Open Tree of LifeOpenTreephylogeny backbone↗
CCDBChromosome Counts DB · Tel Aviv U.genome & karyotype↗
PloiDBPloidy Databasegenome & karyotype