| Pteraeolidia ianthina (Angas,1864) Blue dragon nudibranch | 
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| photo by 
	Harasti, David | 
| Family: | Facelinidae () | |||
| Max. size: | 15 cm TL (male/unsexed) | |||
| Environment: | benthic; marine; depth range - 5 m | |||
| Distribution: | Indo-Pacific: East Africa, Arabian Sea to Australia across to Japan and Hawaii; New South Wales, Indonesia. | |||
| Diagnosis: | ||||
| Biology: | Assumed maximum length from Ref. 844. Juveniles feed on zooxanthellae-rich hydroids (Ref. 844). | |||
| IUCN Red List Status: | Not Evaluated (N.E.) Ref. 123251) | |||
| Threat to humans: | harmless | |||
| Country info: |  | |||