Astyris lunata belongs to the order Gastropoda. Members of this order have a shell that is lacking a nacreous layer, radula with 1-3 teeth, and a mantle that forms a siphon (Brusca and Brusca 1990). The color of the shell is brown to yellowish-brown grading from end to center with three series of deep-red or dark brownish-red hook-shaped bands in the middle and at the ends.
- Academy of Natural Sciences Malacolog Version 4.1.0 A Database of Western Atlantic Marine Mollusca. Available online.
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- ITIS. International Taxonomy Inventory System. Available online.
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