Facet the external surface of an individual unit of a compound eye
Facultative parthenogenesis The process by which some eggs develop parthenogenetically if not fertilised.
Faeces Excrement; waste material voided through the anus.
Fairy shrimp A crustacean in the Class Branchiopoda, Order Anocostraca.
False scorpion Pseudoscorpion
Family the major taxonomic division of an order.
Fan worm Sabellida (Annelida)
Fat Body a structure found in certain insects (bumblebees, cockroaches, etc.) that contains stored nutrients
Fauna all the animals naturally inhabiting a certain country or region, or which have lived during a given geological period
Feather star Crinoidea (Echinodermata)
Fecund producing offspring, fruitful
Fecundity The potential reproductive capacity of an organism or population; fertility
Feedback the elements of a control system or homeostatic mechanism linked by reciprocal influences, so that the source or input is continuously modified by the product of the process in order to maintain the necessary degree of constancy. A feedback loop can be negative and have a stabilizing or inhibitory effect, or positive and have a disruptive or facilitative effect.
Female the egg-producing for of an organism
Femur of an insect leg, the third segment from the body between the trochanter and the tibia
Fertile producing or having the capacity to produce offspring
Fertilisation The union of an egg cell and a sperm. This creates a cell capable of developing into a new animal.
Fertility The actual reproductive performance of an organism or population measures as the actual number of viable offspring produced per unit of time; birth rate.
Filamentous like a fine thread
Filiform thread-like
Filter feeder an animal that gets its food by sieving it from particles suspended in water, e.g. bivalves
Firebrat Thysanura
Firefly Lampyridae
Fish louse Branchiura
Fission reproducing by splitting
Fitness The measure of the contribution of a genotype to the next generation relative to other genotypes.
Flagella a long, whip-like process used in locomotion
Flagellum the end and most moveable part of an inesct's antenna
Flea Siphonaptera
Fluid feeders animals that live by sucking nutrient-rich fluids from another living organism, e.g. aphids from plants, human body louse from humans.
Fluke A platyhelminth in the classes trematoda or monoginea
Fly Diptera
Food chain The food pathway that links 2 or more different species. Each forms the food for the species in the next link on the chain, e.g. leaf, beetle, spider, bird, human.
Food chain efficiency The efficiency of transfer of energy from one level to the next in a food chain.
Food web a collection of inter-linked food chains, usually from a particular habitat,see food web of the Atlantic herring.
Foot fringe in slugs the upper edge of the foot circling the whole body, and marked by a continuous groove
Forage to search for food
Fore anterior, towards the head or front end, e. g. forewings
Forficulidae a large family of earwigs (Dermaptera)
Formicidae A family of ants which has around 14 000 species world wide
Fossil a relic or impression of an organism from the past preserved in rock
Fossil fuel a fuel derived from the fossilised remains of organisms, e.g. coal, oil or gas
Fossorial adapted for digging or burrowing, e.g. the legs of a mole cricket
Fragmentation A method of asexual reproduction where the parent separates into parts each of which go on to form a whole organism
Frass Faecal matter and fine animal debris found in soil and on other surfaces
Free living living independently of any host
Frenulum the coupling apparatus joining the front and back wings of moths during flight
Frequency the percentage of samples in a given area which contain the species.
Fritillary A butterfly in the Nymphalidae family.
Frugivorous fruit eating
Fruitfly Drosophilidae
Fungus gnat Mycetophilidae
Furcula the forked organ attached to the abdomen of a springtail which enables it to jump.
Furniture beetle Anobiidae