Jensen, Kathe Rose Zoological Museum, University of Copenhagen, Copenhagen, Denmark.
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An order of gastropods belonging to the Opisthobranchia and consisting of the sap-sucking sea slugs. The order Sacoglossa (alternatively called Ascoglossa) belongs to the informal group Opisthobranchia (clade Heterobranchia, class Gastropoda, phylum Mollusca) and contains approximately 400 species of sap-sucking sea slugs. All members of the Sacoglossa (sacoglossans) [Fig. 1] feed suctorially. Except for two species, they are herbivorous, feeding on the cell sap of one or a few related marine plants. Sacoglossans occur in all the oceans, at shallow depths, reaching their greatest size and diversity in tropical seas. Most species are less than 30 mm (1.2 in.) in length. See also: Gastropoda; Heterobranchia; Mollusca; Opisthobranchia
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