{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,4,17]],"date-time":"2025-04-17T04:10:37Z","timestamp":1744863037061,"version":"3.40.4"},"reference-count":16,"publisher":"Pensoft Publishers","license":[{"start":{"date-parts":[[2025,4,16]],"date-time":"2025-04-16T00:00:00Z","timestamp":1744761600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["CCG"],"abstract":"<jats:p>We analyzed chromosomes of four species of East Asian dobsonflies (Megaloptera: Corydalidae): <jats:italic>Protohermes grandis<\/jats:italic> (Thunberg, 1781), <jats:italic>P. immaculatus<\/jats:italic> Kuwayama, 1964, <jats:italic>P. disjunctus<\/jats:italic> Liu, Hayashi et Yang, 2007 and <jats:italic>P. costalis<\/jats:italic> (Walker, 1853). The chromosome number in all species was 2n = 24, consisting of 11 pairs of autosomes plus the XX chromosomes in females and the Xy<jats:sub>p<\/jats:sub> in males. The karyotype of <jats:italic>P. immaculatus<\/jats:italic> which occurs in near the central part of the Ryukyu Islands, and is a vicarious species of <jats:italic>P. grandis<\/jats:italic>, was similar to the karyotype of <jats:italic>P. grandis<\/jats:italic>. On the other hand, the karyotype of <jats:italic>P. disjunctus<\/jats:italic>, which is from the Sakishima Islands, and is a vicarious species of <jats:italic>P. costalis<\/jats:italic>, resembled that of <jats:italic>P. costalis<\/jats:italic>.<\/jats:p>\n          <jats:p>The X chromosomes are submetacentric, while the Y is the smallest, dot-like chromosome of the set. The sex chromosomes of the first meiotic metaphase (MI) spermatocytes in all species invariably appear as a bivalent-like structure known as parachut bivalents Xy<jats:sub>p<\/jats:sub>, suggesting that the species in this genus share a common sex-bivalent mechanism.<\/jats:p>","DOI":"10.3897\/compcytogen.19.146501","type":"journal-article","created":{"date-parts":[[2025,4,16]],"date-time":"2025-04-16T13:37:21Z","timestamp":1744810641000},"page":"75-82","source":"Crossref","is-referenced-by-count":0,"title":["Chromosomes of four species of dobsonflies, in the genus Protohermes (Megaloptera, Corydalidae, Corydalinae) from East Asia"],"prefix":"10.3897","volume":"19","author":[{"given":"Yoshinori","family":"Takeuchi","sequence":"first","affiliation":[{"name":"Bohkai Junior High School, Hyogo, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Koji","family":"Iizuka","sequence":"additional","affiliation":[{"name":"Matsue 4th Junior High School, Tokyo, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hiroyuki","family":"Koishi","sequence":"additional","affiliation":[{"name":"Matsue 4th Junior High School, Tokyo, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hidehiro","family":"Hoshiba","sequence":"additional","affiliation":[{"name":"Tamagawa Univesity, Tokyo, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"2258","published-online":{"date-parts":[[2025,4,16]]},"reference":[{"issue":"11","key":"146501_B1","first-page":"19","article-title":"Ecology and phylogenetic location of Protohermes immaculatus (Megaloptera, Corydalidae) on Amami-Oshima Islands.","volume":"24","author":"Hayashi","year":"1989a","journal-title":"The Nature and Insects"},{"key":"146501_B2","first-page":"354","article-title":"Discovery of the adult dobsonfly Protohermes disjunctus (Megaloptera, Corydalidae) on Ishigaki and Iriomote Islands.","volume":"26","author":"Hayashi","year":"1989b","journal-title":"The Insectarium"},{"issue":"10","key":"146501_B3","first-page":"25","article-title":"Life history of Protohermes costalis (Megaloptera, Corydalidae) in Taiwan.","volume":"24","author":"Hayashi","year":"1989c","journal-title":"The Nature and Insects"},{"key":"146501_B4","doi-asserted-by":"publisher","DOI":"10.1266\/jjg.64.209"},{"key":"146501_B5","doi-asserted-by":"publisher","DOI":"10.1007\/BF00368144"},{"key":"146501_B6","first-page":"1","article-title":"The chromosomes of Chauliodes japonicus MacLachlan.","volume":"45","author":"Itoh","year":"1933a","journal-title":"Zoological Magazine (Tokyo)"},{"key":"146501_B7","first-page":"199","article-title":"The chromosomes of Protohermes grandis Thunberg.","volume":"45","author":"Itoh","year":"1933b","journal-title":"Zoological Magazine (Tokyo)"},{"key":"146501_B8","doi-asserted-by":"publisher","DOI":"10.1007\/BF00426367"},{"key":"146501_B9","doi-asserted-by":"publisher","DOI":"10.5026\/jgeography.105.3_259"},{"key":"146501_B10","year":"2025"},{"key":"146501_B11","doi-asserted-by":"publisher","DOI":"10.1111\/j.1601-5223.1964.tb01953.x"},{"key":"146501_B12","author":"Smith","year":"1978","journal-title":"Animal cytgenetics 3. Insecta 5. Coleoptera."},{"key":"146501_B13","first-page":"49","article-title":"Chromosomes of the Japanese dobsonfly Protohermes grandis (Megaloptera: Corydalidae).","volume":"6","author":"Takeuchi","year":"2002","journal-title":"Chromosome Science"},{"key":"146501_B14","first-page":"23","article-title":"Chromosomes of two species of Japanese fishflies in the genus Parachauliodes (Megaloptera: Corydalidae: Chauliodinae).","volume":"15","author":"Takeuchi","year":"2012a","journal-title":"Chromosome Science"},{"key":"146501_B15","first-page":"37","article-title":"Chromosomes of two species of Japanese fishflies in the genus Neochauliodes (Megaloptera: Corydalidae: Chauliodinae).","volume":"14","author":"Takeuchi","year":"2012b","journal-title":"Biogeography"},{"key":"146501_B16","doi-asserted-by":"publisher","DOI":"10.1080\/01650424.2012.717951"}],"container-title":["Comparative Cytogenetics"],"original-title":[],"link":[{"URL":"https:\/\/compcytogen.pensoft.net\/article\/146501\/download\/pdf\/","content-type":"application\/pdf","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/compcytogen.pensoft.net\/article\/146501\/download\/xml\/","content-type":"application\/xml","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/compcytogen.pensoft.net\/article_preview.php?id=146501&skip_redirect=1","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,4,16]],"date-time":"2025-04-16T13:37:23Z","timestamp":1744810643000},"score":1,"resource":{"primary":{"URL":"https:\/\/compcytogen.pensoft.net\/article\/146501\/"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2025,4,16]]},"references-count":16,"URL":"https:\/\/doi.org\/10.3897\/compcytogen.19.146501","relation":{},"ISSN":["1993-078X","1993-0771"],"issn-type":[{"value":"1993-078X","type":"electronic"},{"value":"1993-0771","type":"print"}],"subject":[],"published":{"date-parts":[[2025,4,16]]}}}