Table 4. Variation of GC content in the COI barcode region and codon position among the Decapoda and from 11 selected families.

				Codon position
Taxon	Min.	Mean	Max.	1st	2nd	3rd
Order
Decapoda	30.8	39.39±0.085	49.4	50.90±0.062	42.92±0.021	21.73±0.213
(1572 seq, 528 sp, 213 gen, 67 fam)
Families
Atyidae	35.30	42.40±0.346	47.00	52.76±0.170	43.51±0.099	30.83±0.958
(59 seq, 16 sp, 9 gen)
Chirostylidae	31.50	33.05±0.139	35.60	49.54±0.129	42.78±0.508	6.81±0.328
(66 seq, 13 sp, 1 gen)
Crangonidae	34.60	39.33±0.361	47.60	50.46±0.227	43.17±0.083	24.36±0.904
(58 seq, 16 sp, 7gen)
Galatheidae	33.20	37.24±0.169	45.50	50.56±0.148	43.03±0.037	18.11±0.493
(220 seq, 84 sp, 10 gen)
Lithodidae	34.40	36.31±0.226	40.40	48.82±0.107	43.76±0.097	16.36±0.621
(52 seq, 12 sp, 6 gen)
Majidae	30.80	35.37±0.253	38.70	48.29±0.244	42.22±0.066	15.61±0.574
(67 seq, 24 sp, 14 gen)
Paguridae	32.40	36.34±0.197	41.00	49.80±0.262	43.07±0.051	16.14±0.608
(57 seq, 24 sp, 14 gen)
Palaemonidae	36.40	41.01±0.404	48.60	52.70±0.311	43.83±0.094	26.51±0.884
(87 seq, 32 sp, 5 gen)
Pandalidae	35.20	41.93±0.274	49.40	51.39±0.163	43.32±0.066	31.06±0.740
(74 seq, 19 sp, 5 gen)
Parastacidae	37.30	40.39±0.186	48.60	51.25±0.110	43.34±0.063	26.53±0.550
(98 seq, 43 sp, 8 gen)
Portunidae	31.90	38.31±0.334	44.20	50.44±0.243	41.87±0.056	22.60±0.866
(90 seq, 22 sp, 10 gen)