Biodiversity knowledge through web design: the World of Crayfish® platform

Biodiversity databases have expanded dramatically over the past two decades, turning scattered observations into vast digital repositories of species occurrence records. General-purpose infrastructures such as the Global Biodiversity Information Facility (GBIF) and the Atlas of Living Australia have transformed how this evidence is mobilised, standardised, and shared across the whole tree of life. Alongside these horizontal aggregators, a complementary need persists: turning occurrence data into knowledge that is tailored to the specific questions, vocabulary, and conservation context of a particular taxonomic community, and delivering it without obliging every user to download, clean, and analyse the underlying records themselves. This paper describes the design philosophy, technical implementation, and functionality of the World of Crayfish® (WoC®) platform (https://world.crayfish.ro), a freshwater crayfish knowledge interface built so that a user moves directly from selecting a species to an interpretable biogeographic synthesis. The platform combines interactive basin-level mapping, automated narrative summaries, ranked bibliographies, environmental-trait profiles, and machine-readable exports, all generated from a curated, expert-validated occurrence database and exposed through a deliberately minimal, in-house technical stack. WoC® is positioned not as a competitor to general aggregators but as a taxon-tailored layer that sits above them: a worked example of how user-centred web design, expert curation, and a small set of explicit design principles can lower the barrier between complex biodiversity infrastructures and the diverse communities, researchers, conservation practitioners, and decision-makers who depend on them. The components described here are operational and were verified against the live platform at the time of writing; three further analytical engines named on the platform's tools page are conceptual placeholders under development and are identified as such. This paper argues that the interface itself is a substantive layer of biodiversity knowledge production and sets out which elements of the approach are generic and transferable and which are specific to crayfish. The gap between biodiversity data availability and knowledge accessibility is a community-specific problem that user-centred web design can directly address, complementing rather than replacing general-purpose aggregators. The World of Crayfish® platform turns curated, expert-validated occurrence records into species-level biogeographic knowledge through interactive maps, automated narratives, ranked bibliographies, and machine-readable exports. A deliberately minimal technical stack (PHP and SQLite, vanilla JavaScript, and an in-house API exposing Darwin Core-aligned, citable artefacts) makes the platform portable, transparent, and reproducible. Documented local extinction is encoded as a first-class data point, enabling dynamic, reality-aware mapping beyond static range depictions; population origin is carried as a first-class attribute throughout. Four explicit design principles and a curation model combining gated validation with community editing offer a transferable template for knowledge-oriented biodiversity platforms in other taxa.