The Evolutionary Relationship between Microbial Rhodopsins and Metazoan Rhodopsins

Table 2

The number of rhodopsin genes in each metazoan species.

Common name	Phylum	Scientific name	Number of rhodopsins
Sponge	Porifera	Amphimedon queenslandica	0
Hydra	Cnidaria	Hydra magnipapillata	4
Nematode	Nematoda	Caenorhabditis elegans	0
Carolina anole	Chordata	Anolis carolinensis	15
Malaria mosquito	Arthropoda	Anopheles gambiae	9
Honey bee	Arthropoda	Apis mellifera	5
Bovine	Chordata	Bos taurus	6
Amphioxus	Chordata	Branchiostoma floridae	20
Dog	Chordata	Canis lupus familiaris	6
Sea squirt	Chordata	Ciona intestinalis	5
Zebra fish	Chordata	Danio rerio	35
Armadillo	Chordata	Dasypus novemcinctus	2
Fruit fly	Arthropoda	Drosophila melanogaster	6
Atlantic cod	Chordata	Gadus morhua	25
Chicken	Chordata	Gallus gallus	12
Human	Chordata	Homo sapiens	8
Coelacanth	Chordata	Latimeria chalumnae	11
Opossum	Chordata	Monodelphis domestica	8
Mouse	Chordata	Mus musculus	8
Brown bat	Chordata	Myotis lucifugus	6
Platypus	Chordata	Ornithorhynchus anatinus	4
Body louse	Arthropoda	Pediculus humanus	3
Lamprey	Chordata	Petromyzon marinus	3
Acorn worm	Hemichordata	Saccoglossus kowalevskii	1
Sea urchin	Echinodermata	Strongylocentrotus purpuratus	2
Dolphin	Chordata	Tursiops truncatus	5
Clawed frog	Chordata	Xenopus tropicalis	17