{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,4,17]],"date-time":"2025-04-17T04:10:47Z","timestamp":1744863047897,"version":"3.40.4"},"reference-count":24,"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 fishflies (Megaloptera: Chauliodinae). Three species were from western North America (<jats:italic>Dysmicohermes disjunctus<\/jats:italic> (Walker, 1866), <jats:italic>Dysmicohermes ingens<\/jats:italic> Chandler, 1954, and <jats:italic>Orohermes crepusculus<\/jats:italic> (Chandler, 1954)), and another one from eastern North America (<jats:italic>Nigronia serricornis<\/jats:italic> (Say, 1824)). The chromosome number of the three western species was 2n = 22, with the karyotype consisting of 10 pairs of autosomes plus XY in males. The X chromosomes of these three species are subtelocentric, while the Y chromosomes are small and dot-like. Of the ten pairs of autosomes, the last pair is substantially smaller than the others. The chromosome number in the first meiotic metaphase in spermatocytes of <jats:italic>N. serricornis<\/jats:italic> from Michigan was n = 10 (9 autosomal bivalents + Xy<jats:sub>p<\/jats:sub> in the male). The sex chromosomes of <jats:italic>N. serricornis<\/jats:italic> formed parachute-type bivalents synchronously with the autosomes. The parachute-type bivalent Xy<jats:sub>p<\/jats:sub> has also been found in four fishflies and four dobsonflies (Megaloptera: Corydalinae) from East Asia, as well as in a fishfly and a dobsonfly from North America. These data suggest that the two subfamilies of Corydalidae share a common sex-bivalent mechanism, along with many beetles (Coleoptera).<\/jats:p>","DOI":"10.3897\/compcytogen.19.146136","type":"journal-article","created":{"date-parts":[[2025,4,16]],"date-time":"2025-04-16T13:46:01Z","timestamp":1744811161000},"page":"83-90","source":"Crossref","is-referenced-by-count":0,"title":["Chromosomes of four fishfly species (Megaloptera, Corydalidae, Chauliodinae) from North America"],"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":"Tadashi","family":"Nakazato","sequence":"additional","affiliation":[{"name":"hikinejima 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":[{"key":"146136_B1","doi-asserted-by":"publisher","DOI":"10.1111\/syen.12316"},{"key":"146136_B2","author":"Evans","year":"1972","journal-title":"A study of the Megaloptera of the Pacific coastal region of the United States. Ph."},{"key":"146136_B3","first-page":"429","article-title":"Megaloptera.","author":"Hayashi","year":"2018","journal-title":"second edition. Tokyo: Tokai University Press"},{"key":"146136_B4","author":"Heilveil","year":"2004"},{"key":"146136_B5","doi-asserted-by":"publisher","DOI":"10.1266\/jjg.64.209"},{"key":"146136_B6","doi-asserted-by":"publisher","DOI":"10.1007\/BF00368144"},{"key":"146136_B7","doi-asserted-by":"publisher","DOI":"10.5358\/hsj.32.89"},{"key":"146136_B8","first-page":"1","article-title":"The chromosomes of Chauliodes japonicus MacLachlan.","volume":"45","author":"Itoh","year":"1933a","journal-title":"Zoological Magazine (Tokyo)"},{"key":"146136_B9","first-page":"199","article-title":"The chromosomes of Protohermes grandis Thunberg.","volume":"45","author":"Itoh","year":"1933b","journal-title":"Zoological Magazine (Tokyo)"},{"key":"146136_B10","doi-asserted-by":"publisher","DOI":"10.1007\/BF00426367"},{"key":"146136_B11","doi-asserted-by":"publisher","DOI":"10.3897\/zookeys.538.6655"},{"key":"146136_B12","doi-asserted-by":"publisher","DOI":"10.3897\/CompCytogen.v10i4.10775"},{"key":"146136_B13","year":"2025"},{"key":"146136_B14","doi-asserted-by":"publisher","DOI":"10.1111\/j.1601-5223.1964.tb01953.x"},{"key":"146136_B15","doi-asserted-by":"publisher","DOI":"10.5852\/ejt.2022.812.1727"},{"key":"146136_B16","doi-asserted-by":"publisher","DOI":"10.3897\/CompCytogen.v14i4.55358"},{"key":"146136_B17","doi-asserted-by":"publisher","DOI":"10.3897\/zookeys.157.1339"},{"key":"146136_B18","doi-asserted-by":"publisher","DOI":"10.3390\/insects10040086"},{"key":"146136_B19","doi-asserted-by":"publisher","DOI":"10.3390\/insects12050385"},{"key":"146136_B20","doi-asserted-by":"publisher","DOI":"10.3897\/CompCytogen.v10i3.9504"},{"key":"146136_B21","doi-asserted-by":"publisher","DOI":"10.4039\/Ent8258-3"},{"key":"146136_B22","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":"146136_B23","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":"146136_B24","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"}],"container-title":["Comparative Cytogenetics"],"original-title":[],"link":[{"URL":"https:\/\/compcytogen.pensoft.net\/article\/146136\/download\/pdf\/","content-type":"application\/pdf","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/compcytogen.pensoft.net\/article\/146136\/download\/xml\/","content-type":"application\/xml","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/compcytogen.pensoft.net\/article_preview.php?id=146136&skip_redirect=1","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,4,16]],"date-time":"2025-04-16T13:46:02Z","timestamp":1744811162000},"score":1,"resource":{"primary":{"URL":"https:\/\/compcytogen.pensoft.net\/article\/146136\/"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2025,4,16]]},"references-count":24,"URL":"https:\/\/doi.org\/10.3897\/compcytogen.19.146136","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]]}}}