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Online Dictionary of Invertebrate Zoology: Complete Work - Best Text

Online Dictionary of Invertebrate Zoology: Complete Work - Best Text

Online Dictionary of Invertebrate Zoology: Complete Work - Best Text

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Jjacket cells (MESO: Orthonectida) The ciliated somatoderm;the number <strong>of</strong> body rings and their arrangement is <strong>of</strong> taxonomicimportance.jaculatory duct A region <strong>of</strong> the vas deferens through whichsperm is emitted. see ejaculatory duct.Johnston's organ (ARTHRO: Insecta) A chordotonal organ locatedin the second segment <strong>of</strong> the antenna and functioningin sound perception, flight speed indicator or waterwave perception.joint n. [L. jungere, to join] An articulation <strong>of</strong> two successivesegments or parts.Jonstonian organ see Johnston's organjordanon see microspeciesJordan's organ see chaetosematajubate a. [L. jubatus, crested] Fringed with long, mane-likehairs.juga pl. <strong>of</strong> jugumjugal angle (MOLL: Polyplacophora) The angle formed by thetwo halves <strong>of</strong> an intermediate valve.jugal area/tract (MOLL: Polyplacophora) The upper surface <strong>of</strong>a valve immediately adjacent to the jugum, sometimessculptured differently from the rest <strong>of</strong> the surface; dorsalarea.jugal bristles (ARTHRO: Insecta) Bristles located on the edge<strong>of</strong> the jugal lobe.jugal coverage see valve coveragejugal fold see plica jugalisjugal lobe (ARTHRO: Insecta) A lobe at the base <strong>of</strong> the forewing that makes contact with the hind wing to prevent thewings from moving out <strong>of</strong> phase.jugal muscles (MOLL) Thick longitudinal muscles at the base <strong>of</strong>

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