andromorph Female form which is similar to the male of the species.

biotope The habitat and its associated flora and fauna.

bivoltine Two flight periods, two broods.

charophytes Calcareous freshwater algae.

diapause A resting phase, often over-winter as egg or penultimate instar, to enable synchronised emergence the following spring.

dystrophic A term applied to acidic lakes and ponds with peat stained water.

eutrophic, eutrophication A term applied to nutrient enriched lakes and ponds.

exuvia The shed larval skin.

Holarctic Zoogeographic region comprising the Nearctic (North America and Greenland) and the Palaearctic

instar Interval between each larval moult. The larva may pass through 6-15 instars (depending on species) before it finally emerges as an adult.

lotic Flowing water

maturation period The period required for the adult Dragonfly to become sexually mature.

mesotrophic This term is applied to clear water lakes and ponds with beds of submerged aquatic plants and medium levels of nutrients.

oligotrophic A term applied to lakes and ponds with clear water and low levels of nutrients.

oviposition Egg laying

Palaearctic Zoogeographic region comprising Europe, North Africa, western Asia, Siberia, northern China and Japan.

prolarva The stage immediately after hatching when the larva is still enclosed in a membrane.

pruinescence A bluish bloom on body surface that develops as the Dragonfly matures.

rheocrene springs Springs which emerge as streams.

teneral A newly emerged adult, without the full coloration of the mature adult.

turlough A seasonal water body, associated with limestone areas in Ireland.

univoltine One flight period, single brood.

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