Definitions

Habit external appearance, aspect or growth form of an organism
Habitat the place where an organism or population normally lives
Haemocoele the body cavity of arthropods forming part of the blood system
Haemoglobin iron-based respiratory pigment
Haemolymph/hemolymph The fluid filling the haemocoel. Loosely speaking it can be referred to as blood.
Halictidae sweat bees
Halobiont an organism living in a saline (salty) habitat
Halobios the life forms in the seas and oceans
Halocline a saline discontinuity, a salinity gradient
Halolimnic marine organisms adapted to live in fresh water
Halophilous thrives in saline (salty) habitats
Halophobic intolerant of saline habitats
Halteres In true flies the 2 club-like organs that take the place of the hind wings. They act like gyroscopes during flight and help the fly manoeuvre with great precision.
Hamuli The row of tiny hooks on the leading edge of the hind wings of bees and wasps. In flight the hooks zip on to the edge of the fore wings so the pair function as one unit.
Haplodiploidy The genetic system where males develop from unfertilised eggs, and are haploid with a single set of chromosomes, whereas females develop from a fertilised egg and are diploid and have a double set of chromosomes. e.g. bumblebees
Haploid cell a cell containing only one set of chromosomes
Hard tick a tick in the Ixodidae family, e.g. the castor bean tick, sheep tick, which has a hard plate and forward-pointing head.
Harem a group of females associated with a single male
Harvestman Opiliones
Hawk moth moths in the Sphingidae family
Hawking feeding in flight as some dragonflies do
Hectocotylus the specialised arm, or part of the arm, in some cephalopods that serves as the male copulatory organ.
Heliothermic organisms that maintain a relatively high body temperature by basking in the sunlight
Heliotropic orienting towards sunlight
Helminthology the study of parasitic flatworms and roundworms
Hemelytra the distinctly thickened or leathery forewings of some bugs which have overlapping, membranous tips
Hemichordata worm-like marine invertebrates, e.g. acorn worms
Hemimetabolous Undergoing development which is gradual and lacks a sharp separation into larval, pupal and adult stages, e.g., crickets and bugs.
Hemiptera bugs, an order of insects characterised by a jointed beak, or rostrum or stylets
Herbivore an animal that feeds on plants or plant-like plankton.
Heredity the transmission of biological traits from parents to their offspring
Heritability The capacity of being inherited. That part of variability that is genetically based.
Hermaphrodite having both sexes in one individual
Hermaphroditic capable of producing ova and spermatozoa, either at the same time or sequentially
Hesperidae The family of butterflies that includes the skippers. The larvae are usually grass feeders, and the adults have large bodies and short wings.
Heterogeneous having a non-uniform structure or composition - opposite homogeneous
Heteroptera a sub-order of the Hemiptera which contains the bed-bugs, shield bugs and pond skaters etc.
Heterothermic cold-blooded
Hexactinellida the class of sponges that includes the glass sponges
Hexapoda Insects
Hibernaculum The place where an animal hibernates or overwinters
Hibernation A period of dormancy in winter (see bumblebee hibernation). During hibernation an animal's body processes drop to a low level.
Hirudinea leeches
Holometabolous Undergoing a complete metamorphosis during development, with the distinct larval, pupal and adult stages, e.g. butterflies and beetles.
Holothuroidea sea cucumbers
Homeostasis The maintenance of a steady state, especially a physiological or social steady state by means of self-regulation through internal feedback responses.
Homeothermic having a body temperature regulated independent of the environmental temperature, "warm-blooded", ability to generate heat.
Home range the area that an animal, or group of animals, uses in its daily activities when foraging for food etc.
Homing the act of returning to an original location, e.g. bumblebees returning to their nest.
Homogeneous Of uniform structure or composition; similar throughout.
Homoptera A sub-order of the insect order Hemiptera; includes the cicadas, aphids, leaf hoppers etc.
Honeydew a sweet-tasting substance exuded by aphids and other sap-feeding bugs.
Horntail also know as a wood wasp, but actually a saw fly!
Horsefly Tabanidae
Horsehair worm Nematomorpha
Horseshoe crab Actually not a crab at all, but in the Celicerata Phylum
Horseshoe worm Phoronida
Host an animal or plant on or inside which a parasite feeds/lives
Host specificity the extent to which an adult parasite is restricted in the variety of host species it can utilize
House spider Aglenidae
Housefly Muscidae
Hoverfly Syrphidae
Hunting spider Lycosidae
Hydrobiology the study of life in aquatic habitats
Hydroid the polyp of a cnidarian
Hydrometridae water measurer
Hydraulic operated by water pressure
Hydrophilous Thriving in wet, or aquatic habitats. Pollinated by water-borne pollen.
Hydrophobic Intolerant of wet habitats or water. Water repellent.
Hydrostatic skeleton a skeleton composed of fluid held under pressure in a closed body compartment, e.g. in Cnidaria, Platyhelminthes, Nematodes, Annelids.
Hydrozoa A class of Cnidarians.
Hygrobiidae screech beetles.
Hymenoptera bees, wasps, ants and saw flies
Hyperparasitism Parasitism of parasitic insects by other insects
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