# Terrestrial Mollusc Key > Reference key for identifying agricultural and quarantine-significant terrestrial molluscs. (iPhone/iPad app by United States Department of Agriculture-APHIS.) - Source: https://appshunter.io/ios/app/terrestrial-mollusc-key/id818984385 (this page in markdown: same URL + `.md`) - Developer: [United States Department of Agriculture-APHIS](https://appshunter.io/developer/511305053) - Category: Reference, Education - Price: Free - Rating: 5.00/5 from 5 App Store ratings · 2 written reviews indexed - Age rating: 4+ - Requires: iOS 10.0 · 69 MB - Languages: English - Released: 2014-02-20 - Data updated: 2026-06-10 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/terrestrial-mollusc-key/id818984385/reviews.md ## What is Terrestrial Mollusc Key? The Terrestrial Mollusc key was specifically designed to assist in the identification of adult terrestrial slugs and snails of agricultural importance. The key also includes species of quarantine significance as well as invasive and contaminant mollusc species commonly intercepted at U.S. ports of entry. This key is designed for federal, state and other agencies or organizations within the U.S. that are concerned with the detection and identification of molluscs of significance. This key includes 33 families and 128 species. It should be noted that this key is not inclusive of all mollusc pests, as new species of interest arise almost daily. The list of species included in this key was generated based on pest species reported in scholarly publications by Barker 2002, Cowie et al. 2009, and Godan 1983 as well as commonly intercepted species documented in the port of entry interception data from US Department of Agriculture, Animal and Plant Health Inspection Service, Plant Protection and Quarantine division (USDA-APHIS-PPQ) and the Florida Department of Agriculture and Consumer Services (FDACS) -Division of Plant Industry. The key is unable to identify a few entities below the family level. This is true especially for the families Veronicellidae and Succineidae. The major reason for this is the lack of diagnostic morphological characters and the variability of members of these groups. In many cases, it is recommended that molecular techniques be used in the identification of members of these families (Holland and Cowie 2007; Gomes et al. 2010). This inadequacy of the key is, however, mitigated by the fact that most if not all members of these problematic groups are pestiferous and as such are regulated at the family level. The same is true for the species complexes (e.g., Arion hortensis group, A. ater group) included in the key. The Terrestrial Mollusc Key was developed and published by the Center for Plant Health Science and Technology (CPHST) as part of a cooperative agreement with the Department of Entomology and Nematology, University of Florida and the United States Department of Agriculture (USDA), Animal and Plant Health Inspection Service (APHIS), Plant Protection and Quarantine (PPQ) and is under the direction of Terrence Walters, CPHST Identification Technology Program (ITP) coordinator. The photographs utilized in this key were generously provided by those credited on each. The photographers and organizations that gave permission to use their images are also credited in the acknowledgements of the original tool (http://idtools.org/id/mollusc/). All drawings were produced by the University of Florida, unless otherwise noted. Author: Jodi White-McLean (Department of Entomology and Nematology, University of Florida) Editors and Advisors: John Capinera (Department of Entomology and Nematology, University of Florida) and John Slapcinsky (Florida Museum of Natural History, University of Florida) Original Illustrations and Photography: Kay Weigel and Lyle Buss (Department of Entomology and Nematology, University of Florida) Original Source: This key is part of the complete Terrestrial Mollusc Tool (requires internet connection) at http://idtools.org/id/mollusc/ Lucid Mobile key developed by USDA APHIS ITP ## Key features - Identification of adult terrestrial slugs and snails - Covers species of agricultural importance - Includes quarantine and invasive species - Features 33 families and 128 species - Based on scholarly publications and interception data ## Recent user reviews (2 of 2) All indexed reviews: https://appshunter.io/ios/app/terrestrial-mollusc-key/id818984385/reviews.md ### 5/5 — Its amazing *2023-01-28* This app found what type of snail i had i really appreciate this app the creator is a genius 10/10 ### 5/5 — Great app *2020-07-25* This app Is great it easily identified the exact snail I was looking for through a series of questions. Most apps I had tried before this required a payment to use it after I already had downloaded it for free. This has no ads and will even tell you information on the creature. Five star rating. ## Frequently asked questions about Terrestrial Mollusc Key ### What is the Terrestrial Mollusc Key? The Terrestrial Mollusc Key is a reference tool designed to help identify adult terrestrial slugs and snails that are of agricultural importance, quarantine significance, or are invasive species commonly intercepted at U.S. ports of entry. It covers 33 families and 128 species. ### Is the Terrestrial Mollusc Key free to use? Yes, the Terrestrial Mollusc Key is completely free to download and use. It does not have any associated costs or in-app purchases. ### What devices does the Terrestrial Mollusc Key support? The Terrestrial Mollusc Key is available for iPhone, iPad, and iPod. It is designed for iOS devices. ### How often is the Terrestrial Mollusc Key updated? The latest version of the Terrestrial Mollusc Key is 1.1.0, which was last updated on November 15, 2019. While not updated frequently, it provides a stable reference for identified species. ### Can the Terrestrial Mollusc Key identify all mollusc species? The key includes 33 families and 128 species, but it is not inclusive of all mollusc pests, as new species of interest arise frequently. It also notes limitations in identifying certain entities below the family level, recommending molecular techniques in those cases. ### What is the age rating for the Terrestrial Mollusc Key? The Terrestrial Mollusc Key has an age rating of 4+. This indicates it is suitable for users of all ages, with no content restrictions. ### Does the Terrestrial Mollusc Key contain advertisements? No, the Terrestrial Mollusc Key does not contain any advertisements. It is a free application that provides an ad-free experience for users. ### Who developed the Terrestrial Mollusc Key? The Terrestrial Mollusc Key was developed and published by the Center for Plant Health Science and Technology (CPHST) as part of a cooperative agreement with the University of Florida and the United States Department of Agriculture (USDA). ## Version history (last 5 releases) ### 1.1.0 — 2019-11-15 Updated for iOS 13 ### 1.0.3 — 2015-09-22 Updated for IOS9 changes ### 1.0.2 — 2015-09-17 Updates to content and to the latest version of the Lucid Mobile player. ### 1.0.1 — 2014-11-25 fixed crash under iOS 8 ### 1.0.0 — 2014-02-20 No release notes. ## More apps by United States Department of Agriculture-APHIS - [Citrus Pests Key](https://appshunter.io/ios/app/citrus-pests-key/id816016765) - [Citrus Diseases Key](https://appshunter.io/ios/app/citrus-diseases-key/id818939368) - [Dried Botanicals Key](https://appshunter.io/ios/app/dried-botanicals-key/id818972882) - [Palm Symptoms Key](https://appshunter.io/ios/app/palm-symptoms-key/id818991417) - [Palm ID Key](https://appshunter.io/ios/app/palm-id-key/id818999178) All apps by United States Department of Agriculture-APHIS: https://appshunter.io/developer/511305053 ## Related topics [biocidedosecalus](https://appshunter.io/ios/topics/biocidedosecalus) · [alcidae](https://appshunter.io/ios/topics/alcidae) --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-10.*