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Sacoglossa
The order Sacoglossa (also known as Ascoglossa) is a highly diverse assemblage of opisthobranchs that are united by their specialized radular morphology. Only one radular tooth is used at a given time and worn teeth are stored internally in a sack. Nearly all sacoglossans are herbivores, using their radular tooth to puncture algal cells, then sucking out the contents. Most feed on green algae. The cells lining the digestive gland in many species engulf functional chloroplasts derived from their algal food. These organelles, called kleptoplastids, continue to photosynthesize providing sugars that may be important for their host's nutrition. At least eight families are found in Hawaii.

Medina, et. al., (2011) recovers the Siphonariidae as the sister group to the Sacoglossa and they could be inserted as the next order under the name Siphonariacea (or be grouped with the Sacoglossa as the Siphoglossa). However, since they haven't been traditionally considered opisthobranchs, we've decided to leave them in the marine pulmonate addendum, at least for now.

Cylindrobullidae

Juliidae

Oxynoidae

Plakobranchidae





Boselliidae

Limapontiidae

Hermaeidae

Caliphyllidae
 
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