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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> 277with one another and sometimes posteriorly with the exterior;thought to be seminal storage tubes.demarcation line (MOLL: Bivalvia) Imaginary line joiningpoints on the beak with points <strong>of</strong> maximum transversegrowth <strong>of</strong> the shell margin; forms dorsoventral pr<strong>of</strong>ile.deme n. [Gr. demos, people] A population within a species; anassemblage <strong>of</strong> potentially interbreeding individuals at agiven locality.demersal a. [L. de, away from; mergere, to plunge] Living onor near the bottom <strong>of</strong> a lake or sea.demibranchs n.pl. [Gr. demi, half; branchia, gills] (MOLL: Bivalvia)A pair <strong>of</strong> ciliated gill filaments composed <strong>of</strong> two flatlamellae (inner demibranch and outer demibranch) in whichthere are blood vessels that facilitate respiration and mucociliaryfeeding.demiplate n. [Gr. demi, half; OF. plate, flat] (ECHINOD) A reducedambulacral plate in a compound plate in the test.demiprovinculum n. [Gr. demi, half; pro, before; vinculum,bond] (MOLL: Bivalvia) One half <strong>of</strong> the median part <strong>of</strong> thehinge margin <strong>of</strong> the prodissoconch. see prodissoconch.Demospongiae n. [Gr. demos, multitude; spongos, sponge] Aclass <strong>of</strong> sponges composed <strong>of</strong> spongin fibers alone or togetherwith siliceous spicules that are differentiated intomegascleres (larger size) or microscleres (smaller size) <strong>of</strong>diverse shapes.denatant a. [L. de, away from; natare, to swim] Swimming,drifting or migrating with the current. see contranatant.dendriform a. [Gr. dendron, tree; L. forma, shape] Branchedlike a tree; dendroid.dendrite n. [Gr. dendron, tree] Neural aborizations or branchingfibrils that conduct impulses toward the neurocyte.dendritic a.dendritic see dendroiddendritic flame cells (ACANTHO) Central canal from whichmany smaller canals separate and end in pouches containingcilia.dendritic thickening (BRYO) Extreme skeletal thickening along

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