{"abstract":"We, the U.S. Fish and Wildlife Service (Service), determine threatened species status under the Endangered Species Act of 1973 (Act), as amended, for the eastern massasauga rattlesnake (Sistrurus catenatus), a rattlesnake species found in 10 States and 1 Canadian Province. The rule adds this species to the Federal List of Endangered and Threatened Wildlife. We have also determined that the designation of critical habitat for the eastern massasauga rattlesnake is not prudent due to an increased risk of collection and persecution.","action":"Final rule.","agencies":[{"raw_name":"DEPARTMENT OF THE INTERIOR","name":"Interior Department","id":253,"url":"https://www.federalregister.gov/agencies/interior-department","json_url":"https://www.federalregister.gov/api/v1/agencies/253","parent_id":null,"slug":"interior-department"},{"raw_name":"Fish and Wildlife Service","name":"Fish and Wildlife Service","id":197,"url":"https://www.federalregister.gov/agencies/fish-and-wildlife-service","json_url":"https://www.federalregister.gov/api/v1/agencies/197","parent_id":253,"slug":"fish-and-wildlife-service"}],"body_html_url":"https://www.federalregister.gov/documents/full_text/html/2016/09/30/2016-23538.html","cfr_references":[{"chapter":null,"citation_url":null,"part":17,"title":50}],"citation":"81 FR 67193","comment_url":null,"comments_close_on":null,"correction_of":null,"corrections":[],"dates":"This rule is effective October 31, 2016.","disposition_notes":null,"docket_ids":["Docket No. FWS-R3-ES-2015-0145","4500030113"],"dockets":[],"document_number":"2016-23538","effective_on":"2016-10-31","end_page":67214,"executive_order_notes":null,"executive_order_number":null,"full_text_xml_url":"https://www.federalregister.gov/documents/full_text/xml/2016/09/30/2016-23538.xml","html_url":"https://www.federalregister.gov/documents/2016/09/30/2016-23538/endangered-and-threatened-wildlife-and-plants-threatened-species-status-for-the-eastern-massasauga","images":{"ER30SE16.026":{"large":"https://img.federalregister.gov/ER30SE16.026/ER30SE16.026_large.png","original_size":"https://img.federalregister.gov/ER30SE16.026/ER30SE16.026_original_size.png"},"ER30SE16.027":{"large":"https://img.federalregister.gov/ER30SE16.027/ER30SE16.027_large.png","original_size":"https://img.federalregister.gov/ER30SE16.027/ER30SE16.027_original_size.png"},"ER30SE16.028":{"large":"https://img.federalregister.gov/ER30SE16.028/ER30SE16.028_large.png","original_size":"https://img.federalregister.gov/ER30SE16.028/ER30SE16.028_original_size.png"}},"images_metadata":{"ER30SE16.026":{"large":{"identifier":"ER30SE16.026","content_type":"image/png","size":83646,"width":823,"sha":"c0fd1b94a817aab39d9926ed2ae71e4d","url":"https://img.federalregister.gov/ER30SE16.026/ER30SE16.026_large.png","height":740},"original_size":{"identifier":"ER30SE16.026","content_type":"image/png","size":450831,"width":3551,"sha":"348c1f2288d55f2a9caa06ddbb171a81","url":"https://img.federalregister.gov/ER30SE16.026/ER30SE16.026_original_size.png","height":3193}},"ER30SE16.027":{"large":{"identifier":"ER30SE16.027","content_type":"image/png","size":41423,"width":823,"sha":"a6e0a123ddb16ab15367cb124b84e9e2","url":"https://img.federalregister.gov/ER30SE16.027/ER30SE16.027_large.png","height":508},"original_size":{"identifier":"ER30SE16.027","content_type":"image/png","size":120094,"width":3550,"sha":"4022e4a0b68c93042001a1fcb265c0cb","url":"https://img.federalregister.gov/ER30SE16.027/ER30SE16.027_original_size.png","height":2190}},"ER30SE16.028":{"large":{"identifier":"ER30SE16.028","content_type":"image/png","size":48386,"width":823,"sha":"5cdfd67c64cdc0aa7752ef1504b36732","url":"https://img.federalregister.gov/ER30SE16.028/ER30SE16.028_large.png","height":612},"original_size":{"identifier":"ER30SE16.028","content_type":"image/png","size":189623,"width":3578,"sha":"c6874dac17547bcf159bc69b31e8a18e","url":"https://img.federalregister.gov/ER30SE16.028/ER30SE16.028_original_size.png","height":2662}}},"json_url":"https://www.federalregister.gov/api/v1/documents/2016-23538?publication_date=2016-09-30","mods_url":"https://www.govinfo.gov/metadata/granule/FR-2016-09-30/2016-23538/mods.xml","not_received_for_publication":null,"page_length":22,"page_views":{"count":5247,"last_updated":"2026-10-25 10:15:05 -0400"},"pdf_url":"https://www.govinfo.gov/content/pkg/FR-2016-09-30/pdf/2016-23538.pdf","presidential_document_number":null,"proclamation_number":null,"public_inspection_pdf_url":"https://public-inspection.federalregister.gov/2016-23538.pdf?1475153149","publication_date":"2016-09-30","raw_text_url":"https://www.federalregister.gov/documents/full_text/text/2016/09/30/2016-23538.txt","regulation_id_number_info":{"1018-BA98":{"issue":"201610","html_url":"https://www.federalregister.gov/regulations/1018-BA98/endangered-and-threatened-wildlife-and-plants-listing-determination-for-the-eastern-massasauga-rattl","title":"Endangered and Threatened Wildlife and Plants; Listing Determination for the Eastern Massasauga Rattlesnake","xml_url":"http://www.reginfo.gov/public/do/eAgendaViewRule?pubId=201610&RIN=1018-BA98&operation=OPERATION_EXPORT_XML","priority_category":"Substantive, Nonsignificant"}},"regulation_id_numbers":["1018-BA98"],"regulations_dot_gov_info":{"supporting_documents":[{"title":"Literature Cited in Final Rule to List the Eastern Massasauga Rattlesnake","document_id":"FWS-R3-ES-2015-0145-0078"},{"title":"Species Status Assessment for the Eastern massasauga Rattlesnake","document_id":"FWS-R3-ES-2015-0145-0077"},{"title":"Literature Cited","document_id":"FWS-R3-ES-2015-0145-0003"},{"title":"Eastern Massasauga Rattlesnake Species Status Report","document_id":"FWS-R3-ES-2015-0145-0002"}],"regulatory_plan":{"html_url":"https://www.federalregister.gov/regulations/1018-BA98/endangered-and-threatened-wildlife-and-plants-listing-determination-for-the-eastern-massasauga-rattl","title":"Endangered and Threatened Wildlife and Plants; Listing Determination for the Eastern Massasauga Rattlesnake"},"comments_url":"https://www.regulations.gov/docketBrowser?rpp=50&so=DESC&sb=postedDate&po=0&dct=PS&D=FWS-R3-ES-2015-0145","supporting_documents_count":4,"docket_id":"FWS-R3-ES-2015-0145","regulation_id_number":"1018-BA98","title":"Threatened Status for the Eastern Massasauga Rattlesnake","checked_regulationsdotgov_at":"2016-10-20T06:00:18Z"},"regulations_dot_gov_url":null,"significant":false,"signing_date":null,"start_page":67193,"subtype":null,"title":"Endangered and Threatened Wildlife and Plants; Threatened Species Status for the Eastern Massasauga Rattlesnake","toc_doc":"Eastern Massasauga Rattlesnake; Status","toc_subject":"Endangered and Threatened Species:","topics":["Endangered and threatened species","Exports","Imports","Reporting and recordkeeping requirements","Transportation"],"type":"Rule","volume":81}