{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2024,8,17]],"date-time":"2024-08-17T21:06:04Z","timestamp":1723928764455},"reference-count":50,"publisher":"Pensoft Publishers","license":[{"start":{"date-parts":[[2021,10,26]],"date-time":"2021-10-26T00:00:00Z","timestamp":1635206400000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["ZK"],"abstract":"<jats:p>Freshwater habitats, especially cold springs, are environments in which the risk of extinction faced by organisms remains high due to human activities. To conserve endangered species, it is important to describe and name them. Here, a new, endangered freshwater anisogammarid amphipod species, Jesogammarus (Jesogammarus) acalceolus<jats:bold>sp. nov.<\/jats:bold>, found in a spring in Aomori Prefecture, Japan, is described which is potentially the sole remaining habitat of this species. Both morphological and molecular phylogenetic results strongly support the nesting of the new species within <jats:italic>Jesogammarus<\/jats:italic>. Jesogammarus (J.) acalceolus<jats:bold>sp. nov.<\/jats:bold> is the first species of genus <jats:italic>Jesogammarus<\/jats:italic> that was found to lack a calceolus, a sensory organ located on male antenna 2. Thus, the diagnostic criteria for this genus required amendment. A reconstruction of ancestral calceoli, based on a molecular phylogenetic tree, revealed that the common ancestor of <jats:italic>Jesogammarus<\/jats:italic> possessed calceoli, which were secondarily lost in J. (J.) acalceolus<jats:bold>sp. nov.<\/jats:bold> Our results indicate that this new species, which is key to clarifying the evolution of the calceolus, is of high conservation significance.<\/jats:p>","DOI":"10.3897\/zookeys.1065.71687","type":"journal-article","created":{"date-parts":[[2021,10,26]],"date-time":"2021-10-26T15:34:42Z","timestamp":1635262482000},"page":"81-100","source":"Crossref","is-referenced-by-count":1,"title":["On the brink of extinction: a new freshwater amphipod Jesogammarus acalceolus (Anisogammaridae) from Japan"],"prefix":"10.3897","volume":"1065","author":[{"given":"Ko","family":"Tomikawa","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Naoya","family":"Kimura","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"2258","published-online":{"date-parts":[[2021,10,26]]},"reference":[{"key":"71687_B1","doi-asserted-by":"publisher","DOI":"10.1007\/s10750-007-9246-3"},{"key":"71687_B2","first-page":"297","article-title":"The amphipod superfamily Gammaroidea in the northeastern Pacific region: systematics and distributional ecology.","volume":"3","author":"Bousfield","year":"1979","journal-title":"Bulletin of the Biological Society of Washington"},{"key":"71687_B3","first-page":"68","article-title":"Evolution in North Pacific coastal marine amphipod crustaceans","author":"Bousfield","year":"1981","journal-title":"Hunt Institute for Botanical Documentation"},{"key":"71687_B4","first-page":"1","article-title":"The amphipod genus Ramellogammarus in fresh waters of western North America: systematics and distributional ecology.","volume":"17","author":"Bousfield","year":"1992","journal-title":"Contributions to Natural Science, British Columbia Museum"},{"key":"71687_B5","first-page":"76","article-title":"The phylogenetic classification of amphipod crustaceans: problems in resolution.","volume":"1","author":"Bousfield","year":"1994","journal-title":"Amphipacifica"},{"key":"71687_B6","doi-asserted-by":"publisher","DOI":"10.1163\/1937240X-00002381"},{"key":"71687_B7","doi-asserted-by":"publisher","DOI":"10.1111\/j.1523-1739.2008.01117.x"},{"key":"71687_B8","doi-asserted-by":"publisher","DOI":"10.1111\/geb.12096"},{"key":"71687_B9","doi-asserted-by":"publisher","DOI":"10.1111\/cobi.12496"},{"key":"71687_B10","doi-asserted-by":"publisher","DOI":"10.1017\/S1464793105006950"},{"key":"71687_B11","doi-asserted-by":"publisher","DOI":"10.1006\/anbe.1998.0916"},{"key":"71687_B12","doi-asserted-by":"publisher","DOI":"10.2307\/2408678"},{"key":"71687_B13","doi-asserted-by":"publisher","DOI":"10.1007\/s10592-010-0111-y"},{"key":"71687_B14","doi-asserted-by":"publisher","DOI":"10.1098\/rspb.2011.0433"},{"key":"71687_B15","first-page":"115","article-title":"Comparison of the morphology of calceoli in the fresh water amphipods Crangonyx richmondensis sens. lat. 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