Fig. 2

Published articles searched in PubMed (https://pubmed.ncbi.nlm.nih.gov/), Web of Science (https://www.webofscience.com/wos/woscc/basic-search), and CNKI (https://www.cnki.net/) databases by using the term words. a Number of research articles on the gut microbiota of gastropods between 2004 and 2022. b Distribution of publications by percentage, categorized according to land, freshwater, and seawater snail populations. c Percentage distribution of publications based on sequencing techniques used for studying the gastropod gut microbiota