Phylogenomics of crabs provides insights into their origin and evolution

Phylogenomics of crabs provides insights into their origin and evolution | Research Square window.SnipcartSettings = { analytics: { enabled: false } }; (function() { var accessVector = localStorage.getItem('access_vector') || ''; window.dataLayer = window.dataLayer || []; if (accessVector) { window.dataLayer.push({ user: { profile: { profileInfo: { snid: accessVector } } } }); } })(); (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-K279D39R'); Browse Preprints In Review Journals COVID-19 Preprints AJE Video Bytes Research Tools Research Promotion AJE Professional Editing AJE Rubriq About Preprint Platform In Review Editorial Policies Our Team Advisory Board Help Center Sign In Submit a Preprint Cite Share Download PDF Article Phylogenomics of crabs provides insights into their origin and evolution Zhongkai Wang, Boping Tang, Yongxin Li, Gang Wang, Hongyue Liu, and 24 more This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-5612812/v1 This work is licensed under a CC BY 4.0 License Status: Posted Version 1 posted You are reading this latest preprint version Abstract Crabs encompass the infra-orders Brachyura and Anomura, collectively constitute the clade Meiura within order Decapoda. Despite their considerable diversity, genomic resources for crabs remain scarce, hindering our understanding of their phylogeny and genetic mechanisms underlying such unique traits as carcinization. To address these questions, here we sequenced genomes of 10 crab species covering all currently controversial taxonomies at section level. Our whole-genome phylogenetic results support Raninoida is closer to Eubrachyura rather than Dromiacea, challenging the traditional classifications. Notably, the freshwater crab subsection Potamoida, represented by S. planum, is found to be more closely related to subsection Thoracotremata than to Heterotremata as previously suggested, indicating that crab classification based solely on morphology may be misleading. Our results also clarify that the family Gecarcinidae should be classified into Thoracotremata, contrary to previous placements in Heterotremata. Comparative genomic analyses identified lineage-specific families related to crab traits, including ionotropic glutamate receptors, neurotransmitters, and energy metabolism. Additionally, transcriptomic studies of Chinese mitten crab larval stages suggest that some lineage-specific genes such as ghrA, and TCB2, may account for the prominent carcinization in brachyurans. This study not only significantly expands the genomic repository for crabs, but also provides insights into the phylogeny and trait evolution of crabs. Biological sciences/Evolution/Phylogenetics Biological sciences/Genetics/Evolutionary biology Biological sciences/Evolution/Evolutionary genetics Crabs Brachyura Anomura Genomes Phylogeny Genetic basis of traits Full Text Additional Declarations There is NO Competing Interest. Supplementary Files crabSupplementaryInformation.pdf Supplementary Information for Phylogenomics of crabs provides insights into their origin and evolution SupplementaryTableS63TEfamilyannotationdetail.xlsx Supplementary Table S63 SupplementaryTableS64Comprehensivephylogeneyconstructiontreefile.xlsx Supplementary Table S64 SupplementaryTableS65GOenrichment.xlsx Supplementary Table S65 SupplementaryTableS66KEGGenrichment.xlsx Supplementary Table S66 Cite Share Download PDF Status: Posted Version 1 posted You are reading this latest preprint version Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. As a division of Research Square Company, we’re committed to making research communication faster, fairer, and more useful. We do this by developing innovative software and high quality services for the global research community. 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Also discoverable on Platform About Our Team In Review Editorial Policies Advisory Board Help Center Resources Author Services Accessibility API Access RSS feed Manage Cookie Preferences © Research Square 2026 | ISSN 2693-5015 (online) Privacy Policy Terms of Service Do Not Sell My Personal Information {"props":{"pageProps":{"initialData":{"identity":"rs-5612812","acceptedTermsAndConditions":true,"allowDirectSubmit":true,"archivedVersions":[],"articleType":"Article","associatedPublications":[],"authors":[{"id":400101789,"identity":"c46d6db1-4378-4b40-a6b3-91b4af9c5467","order_by":0,"name":"Zhongkai 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