Agkistrodon contortrix

Northern copperhead

Maximum lifespan

29.8 yr

AnAge record

mtDNA size

16,269 bp

RefSeq NC_035638.1

GC content

42.43%

Whole genome

Non-coding

1,225 bp

Including the D-loop

Where Northern copperhead sits among 2,335 species

Whole-genome GC content against maximum lifespan. Northern copperhead has the 472nd longest lifespan of them.

This species
Other reptiles
Other classes

Plot other mtDNA features with this species highlighted

Base composition

Whole genome16,269 bp

GC skew (G − C) / (G + C): −0.403
AT skew (A − T) / (A + T): +0.147

Life history

Maximum lifespan: 29.8 years
Adult weight: 950 g
Female sexual maturity: 2 years
Male sexual maturity: 2 years
Gestation or incubation: 108 days
Litter or clutch size: 6

Lifespan from AnAge · AnAge record · other traits from AnAge build 15 (HAGRID 03600)

About this record

Lifespan source: AnAge build 15
Based on: an animal in captivity
Data quality: acceptable, medium sample
Licence: Free to use, subject to the Human Ageing Genomic Resources conditions of use
Status: New in build 2
In the database since: build 2 (2026-11-13)

Every change against the 2015 build is in the changelog download.

Composition by region

Reference (L) strand as deposited in RefSeq

Whole genome16,269 bp

Protein-coding11,274 bp

12S rRNA914 bp

16S rRNA1,441 bp

All tRNA1,426 bp

Genes and regions

Select a column to sort; select a gene to compare it across species

Base composition of Agkistrodon contortrix genes

ND1NADH dehydrogenase subunit 1	961 bp	30.7%	24.2%	12.0%	33.1%	45.06%	−0.469	+0.117
ND2NADH dehydrogenase subunit 2	1,030 bp	36.4%	21.9%	8.9%	32.7%	41.65%	−0.571	+0.248
COX1Cytochrome c oxidase subunit I	1,602 bp	28.9%	26.9%	15.7%	28.5%	44.20%	−0.291	+0.036
COX2Cytochrome c oxidase subunit II	685 bp	31.8%	21.5%	15.3%	31.4%	46.72%	−0.344	+0.195
ATP8ATP synthase F0 subunit 8	165 bp	43.0%	19.4%	5.5%	32.1%	37.58%	−0.710	+0.379
ATP6ATP synthase F0 subunit 6	681 bp	31.1%	26.1%	10.0%	32.7%	42.73%	−0.533	+0.087
COX3Cytochrome c oxidase subunit III	787 bp	30.9%	23.6%	14.9%	30.6%	45.49%	−0.346	+0.133
ND3NADH dehydrogenase subunit 3	343 bp	34.1%	23.3%	10.5%	32.1%	42.57%	−0.507	+0.188
ND4LNADH dehydrogenase subunit 4L	291 bp	32.6%	28.2%	10.3%	28.9%	39.18%	−0.474	+0.073
ND4NADH dehydrogenase subunit 4	1,338 bp	32.9%	23.9%	10.6%	32.5%	43.16%	−0.508	+0.158
ND5NADH dehydrogenase subunit 5	1,770 bp	34.8%	23.6%	9.5%	32.1%	41.58%	−0.543	+0.191
ND6NADH dehydrogenase subunit 6	519 bp	45.5%	15.8%	6.4%	32.4%	38.73%	−0.672	+0.484
CYTBCytochrome b	1,114 bp	30.7%	27.6%	10.5%	31.1%	41.65%	−0.496	+0.052
12S rRNA12S ribosomal RNA	914 bp	36.9%	20.5%	17.8%	24.8%	42.67%	−0.164	+0.286
16S rRNA16S ribosomal RNA	1,441 bp	36.2%	22.2%	15.1%	26.2%	41.45%	−0.268	+0.240

Codon usage

Counts per codon, darker is more frequent

Gene

3,759 codons in all protein-coding genes. Grouped with the Vertebrate mitochondrial code (NCBI table 2).

Phe F5.5%

UUU86

UUC120

Leu L16.2%

UUA75

UUG19

CUU81

CUC117

CUA287

CUG30

Ile I8.5%

AUU104

AUC214

Met M6.2%

AUA198

AUG36

Val V4.2%

GUU36

GUC37

GUA63

GUG22

Ser S6.9%

UCU34

UCC71

UCA99

UCG4

AGU12

AGC39

Pro P5.4%

CCU21

CCC75

CCA103

CCG4

Thr T11.0%

ACU54

ACC174

ACA182

ACG5

Ala A6.7%

GCU28

GCC108

GCA110

GCG7

Tyr Y2.9%

UAU44

UAC66

His H2.8%

CAU18

CAC86

Gln Q2.6%

CAA82

CAG15

Asn N3.8%

AAU30

AAC113

Lys K2.8%

AAA97

AAG9

Asp D1.5%

GAU7

GAC48

Glu E2.5%

GAA78

GAG17

Cys C0.7%

UGU11

UGC16

Trp W2.6%

UGA87

UGG10

Arg R1.6%

CGU7

CGC12

CGA40

CGG1

Gly G5.4%

GGU27

GGC66

GGA78

GGG32

Stop 0.2%

UAA3

UAG1

AGA2

AGG1

Genome map

37 annotated features in NC_035638.1

Hover, tap or tab to a feature to see its position, length, strand and GC content. Genes and rRNAs open their own pages.

Protein-coding13
rRNA2
tRNA22

Outer ring: + strand, arrows run clockwise. Inner ring: − strand.
Middle ring: GC% of each gene against the whole genome (42.4%, dashed): out is GC-richer, in is AT-richer (full height = 6 points).

All 37 features as a table

Annotated features of Agkistrodon contortrix (NC_035638.1)
Feature	Type	Start	End	Length	Strand	GC
tRNA-Phe	Transfer RNA	1	63	63 bp	+	–
12S rRNA	Ribosomal RNA	64	977	914 bp	+	42.7%
tRNA-Val	Transfer RNA	978	1,041	64 bp	+	–
16S rRNA	Ribosomal RNA	1,042	2,482	1,441 bp	+	41.5%
ND1	Protein-coding gene	2,483	3,443	961 bp	+	45.1%
tRNA-Ile	Transfer RNA	3,444	3,512	69 bp	+	–
tRNA-Pro	Transfer RNA	3,516	3,579	64 bp	−	–
tRNA-Leu (UUR)	Transfer RNA	4,364	4,436	73 bp	+	–
tRNA-Gln	Transfer RNA	4,437	4,506	70 bp	+	–
tRNA-Met	Transfer RNA	4,507	4,569	63 bp	+	–
ND2	Protein-coding gene	4,570	5,599	1,030 bp	+	41.7%
tRNA-Trp	Transfer RNA	5,600	5,666	67 bp	+	–
tRNA-Ala	Transfer RNA	5,667	5,731	65 bp	−	–
tRNA-Asn	Transfer RNA	5,732	5,803	72 bp	−	–
tRNA-Cys	Transfer RNA	5,837	5,896	60 bp	−	–
tRNA-Tyr	Transfer RNA	5,897	5,957	61 bp	−	–
COX1	Protein-coding gene	5,959	7,560	1,602 bp	+	44.2%
tRNA-Ser (UCN)	Transfer RNA	7,551	7,618	68 bp	−	–
tRNA-Asp	Transfer RNA	7,619	7,681	63 bp	+	–
COX2	Protein-coding gene	7,683	8,367	685 bp	+	46.7%
tRNA-Lys	Transfer RNA	8,368	8,429	62 bp	+	–
ATP8	Protein-coding gene	8,430	8,594	165 bp	+	37.6%
ATP6	Protein-coding gene	8,585	9,265	681 bp	+	42.7%
COX3	Protein-coding gene	9,265	10,051	787 bp	+	45.5%
tRNA-Gly	Transfer RNA	10,052	10,113	62 bp	+	–
ND3	Protein-coding gene	10,114	10,456	343 bp	+	42.6%
tRNA-Arg	Transfer RNA	10,457	10,520	64 bp	+	–
ND4L	Protein-coding gene	10,521	10,811	291 bp	+	39.2%
ND4	Protein-coding gene	10,811	12,148	1,338 bp	+	43.2%
tRNA-His	Transfer RNA	12,148	12,208	61 bp	+	–
tRNA-Ser (AGY)	Transfer RNA	12,209	12,263	55 bp	+	–
tRNA-Leu (CUN)	Transfer RNA	12,264	12,335	72 bp	+	–
ND5	Protein-coding gene	12,337	14,106	1,770 bp	+	41.6%
ND6	Protein-coding gene	14,111	14,629	519 bp	−	38.7%
tRNA-Glu	Transfer RNA	14,630	14,692	63 bp	−	–
CYTB	Protein-coding gene	14,693	15,806	1,114 bp	+	41.7%
tRNA-Thr	Transfer RNA	15,807	15,871	65 bp	+	–