Mysidacea

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Mysidacea

[‚mī·sə′dās·ē·ə]
(invertebrate zoology)
An order of free-swimming Crustacea included in the division Pericarida; adult consists of 19 somites, each bearing one pair of functionally modified, biramous appendages, and the carapace envelops most of the thorax and is fused dorsally with up to four of the anterior thoracic segments.