Amphiprion akallopisos was created in 1853.
There are a lot of different clown fish a.k.a. anemonefish, there are Saddleback Clowns (Amphiprion Ephippium), Maroon Clowns (Premnas Biaculeatus), Tomato Clowns (Amphiprion Frenatus), Clarkii Clowns (Amphiprion Clarkii), Skunk Clowns (Amphiprion Akallopisos), Red Sea Clowns (Amphiprion Bicinctus), etc. But I am assuming you are referring to the "Nemo Clownfish" (Amphiprion Ocellaris), which are commonly confused with True Percula Clownfish (Amphiprion Percula).
* Amphiprion allardi - Allard's clownfish * Amphiprion melanopus - Cinnamon clownfish * Amphiprion clarkii - Clark's anemonefish * Amphiprion ocellaris - Ocellaris clownfish * Amphiprion percula - Percula clownfish * Amphiprion perideraion - Pink skunk clownfish * Amphiprion polymnus - Saddleback clownfish * Amphiprion sebae - Sebae clownfish * Amphiprion bicinctus - Red Sea clownfish * Amphiprion tricinctus - Three-band anemonefish * Amphiprion ephippium - Red saddleback anemonefish * Amphiprion frenatus - Tomato clownfish * Amphiprion chrysopterus - Orange-fin anemonefish * Amphiprion akallopisos - Skunk clownfish * Amphiprion sandaracinos- Orange skunk clownfish * Amphiprion rubacinctus - Australian clownfish * Premnas biaculeatus - Maroon clownfish
Amphiprion nigripes was created in 1852.
Clownfish or Anemonefish include Amphiprion allardi, Amphiprion percula, Amphiprion tricinctus, Amphiprion frenatus,Amphiprion clarkii, Amphiprion melanopus, Amphiprion ocellaris, Premnas biaculeatus, Amphiprion polymnus, Amphiprion sebae, Amphiprion perideraion, etc..
Amphiprion percula.
Amphiprion percula
a barracudda
If by "Clown Fish" you mean the "Nemo" type then they are "Amphiprion sp." and part of the Perciform or perch group of fishes.
Scientific classificationKingdom:AnimaliaPhylum:ChordataClass:ActinopterygiiOrder:PerciformesFamily:PomacentridaeSubfamily:AmphiprioninaeScientific classificationKingdom:AnimaliaPhylum:ChordataClass:ActinopterygiiOrder:PerciformesFamily:PomacentridaeSubfamily:AmphiprioninaeScientific classificationKingdom:AnimaliaPhylum:ChordataClass:ActinopterygiiOrder:PerciformesFamily:PomacentridaeSubfamily:AmphiprioninaeAbout twenty eight species are recognized, one in the genus Premnas, while the remaining are in the genus Amphiprion 
Clownfish are fishes from the subfamily Amphiprioninae in the family Pomacentridae. About twenty eight species are recognized, of which one is in the genus Premnas, while the remaining are in the genus Amphiprion. Clownfish are overall yellow, orange, reddish or blackish, and many show white bars or patches. The largest species reach a length of 7 in., while the smallest barely reach 4 inches.
Wild ocellaris clownfish (Amphiprion ocellaris) eat algae, planktonic organisms that float by its host anemone, and debris that clutter in the anemone. They are omnivores.
If by domain you mean scientific name it is Kingdom: Animalia Phylum: Chordata Class: Actinopterygii Order: Perciformes Family: Pomacentridae Subfamily: Amphiprioninae Genus: Amphiprion Genus: Premnas