Table 4. Molecular evolutionary analyses across crustacean species at Amino acid level.

Enzymes	Gene	No. of species/ Sequences in analysis	Total sites in analysis	Total segregating sites	Total Identical sites	Rate of segregation/ site	Nucleotide diversity	In-Del
Cytoplasmic carbonic anhydrase	CAc	15	265	173	92	0.65283	0.38225	0
GPI-linked carbonic anhydrase	CAg	8	287	128	159	0.445993	0.24029	0
Beta carbonic anhydrase	CAb	16	254	143	111	0.562992	0.2691	0
Na+/K+-ATPase alpha subunit	NKA	16	1,001	243	758	0.242757	0.08577	0
Vacuolar type H+-ATPase 116 kda	HAT-116k	15	803	355	448	0.442092	0.19255	0
Na+/K+/2Cl− cotransporter	NKCC	16	838	586	252	0.699284	0.39172	0
Na+/HCO${}_3^{-}$ cotransporter	NBC	16	1,033	506	527	0.489835	0.23662	0
Na+/H+ exchanger 3	NHE3	15	843	504	339	0.597865	0.25904	0
Na+/Ca+2 exchanger 1	NCX1	15	793	529	264	0.667087	0.28318	0
Arginine kinase	AK	15	355	78	277	0.219718	0.07329	0
Sarco/endoplasmic reticulum Ca+2-ATPase	SERCA	15	989	276	713	0.27907	0.12366	0
Calreticulin	CRT	15	396	193	203	0.487374	0.212	0