TARDIGRADE ROTIFER Has jointed legs Flexible, segmented Tubular or flask-shaped, bodies with 8 legs transparent body with a gaping YES NO equipped with curved mouth surrounded by beating Invertebrates with claws. hairs jointed legs are known as ARTHROPODS Some invertebrates in the main key are also microscopic Go to page 2 Body segmented (split into many sections) See also: NO TARDIGRADES above YES

Has a spiral shell Body long, thin, flesh-coloured and mostly cylindrical. Tail end may be slightly flattened. YES NO May have a thick ‘saddle’ towards head end.

SNAIL YES NO Gastropoda EARTHWORM Wet skin. Thick, fleshy body of more than Body thick and fleshy. Skin often textured Oligochaeta 15 segments. Moves by stretching and hunching NO YES along using suckers at each end.

NO YES Body thin and cylindrical. SLUG Translucent. Moves by wiggling or Gastropoda thrashing side to side INSECT LARVA LEECH Hirudinea YES NO (e.g. Maggot) Some insect larvae have six jointed legs and sucker-like prolegs NEMATODE LAND FLATWORM but these may not be Nematoda Geoplanidae visible from above (e.g. UK leeches live in water but beetles, sawflies and some travel across land between caterpillars). water bodies. See Key to insects and 1 relatives for more detail.

© Matt Shardlow Less than 6 This Bug has lost some legs! More than 8 START: How many legs? 6 If more than 2 body 8 segments, go to the Key to A pair of palps at the Insects and relatives front can look like an If 1 or 2 body segments, go extra pair of legs to Arachnids Body separated into two sections with a waist between Long, slender body NO NO YES YES More than 2 body segments? Very long legs. Visible eyes. SPIDER (Aranae) Body flattened side 2 Pairs of legs per body YES NO to side. Can jump segment. Can curl into a coil. NO HARVESTMAN YES Pincers on long palps MITE LARVA YES NO (Opiliones) Acari MILLIPEDE NO YES Diplopoda Long, thin antennae? NO YES MITE FALSE SCORPION NO YES (Acari) (Pseudoscorpiones) WOODLOUSE Body very long and thin. YELLOW-TAILED SCORPION PAUROPOD Oniscidea © John Mason Short legs (Euscorpius flavicaudis) Pauropoda YES NO Only found in a few Southern dock areas. Non-dangerous. SOIL CENTIPEDE Long legs, very fast moving Invertebrates with 6 legs as LANDHOPPER © Dikhou PILL MILLIPEDE Arcitalitrus dorrieni YES NO adults are called Glomeris spp. HEXAPODS. They include SANDHOPPER INSECTS See key to insects Talitridae HOUSE CENTIPEDE Obvious jaws either side of head and relatives © Rob Swatski Scutigeridae YES NO Some arachnids can lose © Steve Trewella their legs (e.g. Spiders and © Roger key © Gregory Hitchcock Landhoppers live in soil and are Harvestmen) check the Pill woodlice and Pill millipedes can often dark brown. Sandhoppers ARACHNIDS roll into a ball. Pill millipedes have live amongst sand and gravel on STONE CENTIPEDE SYMPHYLAN 2 a hard shield at the rear, which the seashore and are pale. Lithobiidae Symphyla they can tuck their head under to form a complete circle.