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Online Dictionary of Invertebrate Zoology: Complete Work - Best Text

Online Dictionary of Invertebrate Zoology: Complete Work - Best Text

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818Maggenti and GardnerSemper's cells see cells <strong>of</strong> SemperSemper's larva (CNID: Anthozoa) In Zoantharia, pelagic larvawith long cilia.Semper's rib (ARTHRO: Insecta) In Lepidoptera, a degeneratetrachea present in the wing, alongside a functioning tracheawithin the vein cavity.senescence n. [L. senescere, to grow old] The gradual deterioration<strong>of</strong> function in an organism leading to an increasedprobability <strong>of</strong> death; the ageing process.senility n. [L. senex, old] Old age.senior homonym The earliest published <strong>of</strong> two or more identicalnames for the same or different taxa. see homonym,junior homonym.senior synonym The earliest published <strong>of</strong> two or more availablenames for the same taxon. see synonym, juniorsynonym.sense club see rhopaliumsense cone/peg (ARTHRO: Insecta) 1. A minute cone or peg,sensory in function. 2. Sense cone <strong>of</strong> Hayes, see nesium.sense organ A simple or multicellular receptor organ, comprised<strong>of</strong> at least one sensory cell and accessory structures.sensilla n.; pl. -ae [L. sensus, sense] see sensillum.sensilla candelari (ARTHRO: Insecta) In the fulgorid Pyropsfolded sensory plaque organs having numerous bipolarneurons arranged in groups; may have evolved from acluster <strong>of</strong> basiconic sensilla.sensilla circumfila (ARTHRO: Insecta) Thin-walled chemoreceptorswith pores on fine surface ridges <strong>of</strong> elaboratelylooped sensilla on the antennae <strong>of</strong> cecidomyids.sensilla pouch (NEMATA) An expansion <strong>of</strong> the amphidial tube,containing the sensory elements <strong>of</strong> the sensilla situatedposterior to the amphidial pouch; fusus amphidialis.sensillium see sensillum.sensillum n.; pl. -la [L. sensus, sense] 1. A receptor complexcomposed <strong>of</strong> a sense cell or units <strong>of</strong> sense cells plus associatedstructures: innervated hair, flat sensory plate, or sen-

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