Leptostraca (from the Greek words for thin and shell) is an order of small, marine crustaceans. Its members, including the well-studied Nebalia, occur throughout the world`s oceans and are usually considered to be filter-feeders. It is the only extant order in the subclass Phyllocarida. They are believed to represent the most primitive members of....
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http://en.wikipedia.org/wiki/Leptostraca
• (n. pl.) An order of Crustacea, including Nebalia and allied forms.
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http://thinkexist.com/dictionary/meaning/leptostraca/
Lep·tos'tra·ca (lĕp*tŏs'trȧ*kȧ)
noun plural [ New Latin , from Greek
lepto`s thin, slender +
'o`strakon shell of a testacean.]
(Zoology) An order of Crustacea, including Nebalia and allied forms.
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http://www.encyclo.co.uk/webster/L/31
Leptostraca is a marine order of crustaceans of the sub-class Malacostraca. The carapace takes the form of a bivalved shell. In the front of the head region is a movable head plate.
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http://www.probertencyclopaedia.com/browse/BL.HTM
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