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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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916Maggenti and Gardnerthree parts, divisions or segments.tripectinate a. [L. tres, three; pecten, comb] Having threerows <strong>of</strong> comb-like branches.triplet n. [L. tres, three; plus, more] Three successive nucleotidebase pairs that code for an amino acid.triploblastic a. [Gr. triploos, threefold; blastos, bud] Derivedfrom three embryonic germinal layers: ectoderm, endodermand mesoderm.triploid a. [Gr. triploos, threefold] A cell or individual havingthree haploid chromosome sets in their nuclei; a form <strong>of</strong>polyploidy.triquetral, triquetrous a. [L. triquetrus, three sided] Havingthree angles or arms; triangular in section.triradiate(s) a. [L. tres, three; radius, spoke <strong>of</strong> wheel] 1.Having three radiating process. 2. (PORIF) Spicules havingthe three rays somewhat in the same plane. see sagittaltriradiates.tritocerebral commissure see postesophageal commissuretritocerebral segment see tritocerebrumtritocerebrum n. [Gr. tritos, third; L. cerebrum, brain] (AR-THRO) The posterior (third) small part <strong>of</strong> an arthropod brainthat gives rise to nerves that innervate the labium, the digestivetract (stomatogastric nerves), the chelicerae <strong>of</strong>chelicerates, and the second antennae <strong>of</strong> crustaceans. seemetacerebrum.tritonymph n. [Gr. tritos, third; nymphe, young woman] (AR-THRO: Chelicerata) In Acari, the third stage nymph.tritosternum n. [Gr. tritos, third; sternon, chest] (ARTHRO:Chelicerata) In Mesostigmata, a secondary, ventral, bristlelikesensory organ just behind the gnathosoma.triturate v.t. [L. tritum, rub to pieces] To rub or grind to a finepowder; masticate; pulverize.triungulin, triungulinid n. [L. tres, three; ungula, claw] (AR-THRO: Insecta) First-instar larva <strong>of</strong> some hypermetamorphicNeuroptera, Coleoptera, Hymenoptera, and the Strepsiptera(triungulinid), which are active, compodeiform

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