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| Sources for definitions: Gordh & Headric 2001, Martin & Davis 2004, Lawrence 2000, Thorp& Covitch 1991, Merriam-Webster 2005, Blass 2007 and the various identification key references | |
| umbos | beak or older part of shells of bivalve mollusc |
| uncate | hooked |
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 unicellular |
referring to organism or structure consisting of only one cell |
| unidentate | descriptive of mandibles displaying one tooth only |
| urogpmphi | plural of urogomphus |
| urogomphus | fixed or mobile cuticular processes on the apical abdominal segment |
| uropod | any of the abdominal feet of arthropods |
| urosome | tail region of the abdomen |
| urosomite | a single segment of the tail region of the abdomen |
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| an animal that moves from place to place following the food source, not establishing a shelter or home area | |
| valve | each half of the hinged two-part shells |
| venation | complete system of veins in the wing |
| venter | ventral surface of a segment |
| ventral | descriptive of the underside of the body |
| ventrite | a ventral, sclerotised part of a body segment; the ventral aspect of a body ring of an insect |
| vermiform | worm-shaped; an elongate, cylindrical body with more or less parallel sides and tapered or rounded ends |
| vertex | the top of the head between the eyes |
| viviparous | referring to organisms that bear live young |
| volant | flying or capable of flight |
| voracious | agressive, greedy |
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| waterbody |
an volume of water, standing or flowing, of any size, depth or salinity |
| waterbodies | plural of waterbody |
| water column | the main part of the waterbody that does NOT include the bottom, edges or surface |
| waterfall | sudden vertical descent of a river |
| waterhole | a natural hole or hollow in which water collects |
| wetland | an area saturated with water up to a depth of six metres, wholly or partially, permanent or temporary |
| whorl | the spiral turn of a univalve shell |
| wing pads | the encased underdeveloped wings of nymphs |
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| zooid |
an individual organism in a colony of bryozoans |
| zooplankton | microscopic animal life found floating and drifting in large numbers in bodies of freshwater |
| zygote | cell formed by the union of male and female gametes |
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