Thema Subject Categories 1.4

Previous versions of Thema are still available 1.3 1.2.

Browse the Thema subject categories hierarchy, or search for a specific term within the hierarchy.

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Notation Category heading Add Mod ?
P Mathematics and Science
Use all P* codes for: mostly academic, technical and specialist titles and some general adult works. Qualifiers are mostly not required with P* codes. DO NOT USE: code ‘P’ itself, but select specific categories from section P*.
Prefer: WN* codes for general interest adult titles where appropriate
PS Biology, life sciences
Use all PS* codes for: academic, specialist and professional level works.
Prefer: WN* codes for natural history etc for the general reader.
See also: WN* Nature and the natural world: general interest and its subcategories
PSV Zoology and animal sciences
See also: WNC Wildlife: general interest
PSVA Zoology: invertebrates
Class here: annelids (worms), Myriapoda, echinoderms (starfish, sea urchins), jellyfish.
See also: WNCN Wildlife: butterflies, other insects and spiders: general interest
PSVA2 Insects (entomology)
Class here: caterpillars, butterflies and moths
PSVA4 Crustaceans (carcinology)
Class here: crabs, lobsters, crayfish, shrimp, krill, woodlice, barnacles etc
PSVA6 Molluscs (malacology)
Class here: cephalopod, octopus, squid, gastropods, snails, slugs, bivalves, clams, oysters, cockles, mussels, scallops etc
PSVA8 Arachnids (arachnology)
Class here: spiders, scorpions, ticks, mites etc

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