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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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<strong>Online</strong> <strong>Dictionary</strong> <strong>of</strong> <strong>Invertebrate</strong> <strong>Zoology</strong> 883synaptic knobs Swellings on the axon ends where contact ismade with dendrites <strong>of</strong> another nerve cell.synapticulum n.; pl. -la [Gr. synapsis, union] (CNID) One <strong>of</strong>numerous conical or cylindrical calcareous processes connectingthe septa. synapticular a.synaptinemal complex Organelle present during pachytenestage <strong>of</strong> eukaryote meiosis visable in electron micrographs.synaptorhabdic a. [Gr. synapsis, union; rhabdos, rod] (MOLL:Bivalvia) Pertaining to ctenidia where filaments are connectedat their interlamellar edges by strands <strong>of</strong> cellulartissue; organic interfilamentary junctions. see eleutherorhabdic.synaptychus n. [Gr. syn, together; apo-, away from; ptychos,fold] (MOLL: Cephalopoda) Double calcareous plates fusedwith other paired plates. see anaptychus.syncerebrum n. [Gr. syn, together; L. cerebrum, brain] Thesupraesophageal glanglia or brain <strong>of</strong> many invertebrates.synchronic speciation Speciation that occurs at the sametime level. see allochronic speciation.synchronizer n. [Gr. syn, together; chronos, time] An environmentalfactor that influences the phenomena <strong>of</strong> circadianrhythm to conform to a daily cycle instead <strong>of</strong> wandering.synclerobiosis n. [Gr. syn, together; keros, chance; bios, life](ARTHRO: Insecta) In Hymenoptera, a temporary association<strong>of</strong> two species <strong>of</strong> ants <strong>of</strong> independent colonies.synconoid grade (PORIF) A grade <strong>of</strong> construction intermediatebetween the asconoid and the leuconoid, in which each radialcanal is subdivided into elongate-flagellate chambersgrouped around a common excurrent channel. see leuconoidgrade, asconoid grade.syncyte n. [Gr. syn, together; kytos, container] A polyploid ormultinucleate cell.syncytium n.; pl. syncytia [Gr. syn, together; kytos, container]A continuous mass <strong>of</strong> protoplasm with several ormany nuclei; a multinucleate cell. syncytial a.syndesis n. [L. syndesis, a binding together] 1. Binding to-

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