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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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642Maggenti and Gardnerorthometaneme n. [Gr. orthos, straight; meta, after; nema,thread] (NEMATA) A metaneme parallel to the longitudinalbody line; found at the dorsal or ventral border <strong>of</strong> the lateralepidermal cords.Orthonectida, orthonectids n.; n.pl. [Gr. orthos, straight;nekton, swimming] A class <strong>of</strong> Mesozoa with an asexualparasitic plasmodial generation in many marine invertebratesand a sexual free-swimming generation.orthoneury n. [Gr. orthos, straight; neuron, nerve] (MOLL:Gastropoda) In forms with bilateral zygoneury, the condition<strong>of</strong> the visceral loop ganglia and crossed connectivesindicating earlier streptoneury are still evident thoughsometimes reduced. see detorsion.orthoploid see euploidorthoselection n. [Gr. orthos, straight; L. selectus, select]Natural selection continuously acting in one direction over along period <strong>of</strong> time.orthosomatic a. [Gr. orthos, straight; soma, body] Having abody in a straight line.orthostasy n. [Gr. orthos, straight; stasis, standing] (ARTHRO:Chelicerata) Stage in acarology life-cycle evolution showingonly stases and no stasoids.orthostrophic a. [Gr. orthos, straight; strophe, to turn] (MOLL:Gastropoda) Coiled in a normal manner, as opposed to hyperstrophic.orthotaxy n. [Gr. orthos, straight; taxis, arrangement] Thearrangement <strong>of</strong> similar organs that have ancestral characters,and have preserved their normal position.orthotriaenes a.pl. [Gr. orthos, straight; triaina, trident] (PO-RIF) In tetraxons, having clads in the angular form <strong>of</strong> about90° with the axis <strong>of</strong> the rhabdome.orthotrichy n. [Gr. orthos, straight; trichos, hair] (ARTHRO:Chelicerata) In acarology, all setae that have not disappearedhave maintained their ancestral position.os n.; pl. ora [L. os, oris, mouth] The mouth.oscillation n. [L. oscillare, to swing] A single swing from oneextreme limit to the other <strong>of</strong> a sine wave.

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