This SOP standardises how to collect, extract, document, and preserve marine microscopic/meiofaunal/interstitial animals for genomic research. It covers the full pipeline from pre-collection planning (permits, logistics, safety, vouchering and repository coordination) through field sampling, lab extraction and sorting, identification and imaging, and DNA/RNA preparation via snap-freezing or other preservatives. Because whole specimens are usually consumed for sequencing, the SOP emphasises metadata ...