{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,26]],"date-time":"2026-02-26T15:12:39Z","timestamp":1772118759023,"version":"3.50.1"},"reference-count":24,"publisher":"Wiley","issue":"8","license":[{"start":{"date-parts":[[2025,8,19]],"date-time":"2025-08-19T00:00:00Z","timestamp":1755561600000},"content-version":"vor","delay-in-days":18,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"},{"start":{"date-parts":[[2025,8,1]],"date-time":"2025-08-01T00:00:00Z","timestamp":1754006400000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/doi.wiley.com\/10.1002\/tdm_license_1.1"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Journal of Morphology"],"published-print":{"date-parts":[[2025,8]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:p>\n                    We studied the gross gonad morphology, the morphology of genital structures involved in sperm reception and egg release, as well as oocyte development in female\n                    <jats:italic>Centropages hamatus<\/jats:italic>\n                    and\n                    <jats:italic>Temora longicornis<\/jats:italic>\n                    from the White Sea. Our research employed a comprehensive morphological approach, including light microscopy, transmission electron microscopy, and three\u2010dimensional reconstructions based on series of semithin cross\u2010sections. This integrated methodology enabled detailed visualization of the fine\u2010scale morphological structures and main muscle bundles associated with the genital complex and precise mapping of oocyte distribution at different stages of development within the ovaries and diverticula of mature females. In\n                    <jats:italic>T. longicornis<\/jats:italic>\n                    , we discovered glands in the last thoracic somite that were similar in structure and position to the shell glands of egg\u2010brooding calanoid copepods. Unlike previous studies, our approach documented anatomical details of the reproductive system which are typically not detectable using two\u2010dimensional imaging techniques alone. Our observations indicate also that during the reproductive season females of both species are characterized by continuous oocyte maturation and readiness to lay eggs. However, due to the lack of a spermatheca, these females cannot store sperm and, subsequently, require repeated matings to fertilize each batch of eggs produced during the reproductive cycle. We assume that the sex ratio skewed towards males in adult populations of\n                    <jats:italic>C. hamatus<\/jats:italic>\n                    and the equal sex ratio in adult populations of\n                    <jats:italic>T. longicornis<\/jats:italic>\n                    reflect these morphological limitations\u2014specifically, the lack of sperm storage capacity in females coupled with sustained oocyte production in females.\n                  <\/jats:p>","DOI":"10.1002\/jmor.70076","type":"journal-article","created":{"date-parts":[[2025,8,20]],"date-time":"2025-08-20T05:25:21Z","timestamp":1755667521000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["The Reproductive System of Two Species of the Centropagoidea Superfamily From the White Sea"],"prefix":"10.1002","volume":"286","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-2547-1258","authenticated-orcid":false,"given":"Daria A.","family":"Yurikova","sequence":"first","affiliation":[{"name":"Shirshov Institute of Oceanology Russian Academy of Sciences Moscow Russia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3039-4480","authenticated-orcid":false,"given":"Ksenia N.","family":"Kosobokova","sequence":"additional","affiliation":[{"name":"Shirshov Institute of Oceanology Russian Academy of Sciences Moscow Russia"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2025,8,19]]},"reference":[{"issue":"1","key":"e_1_2_13_2_1","first-page":"81","article-title":"Oviducal Gland of Planktonic Copepod, Heliodiaptomus viduus Gurney\u2014A New Report","volume":"66","author":"Altaff K.","year":"1994","journal-title":"Current Science, Bangalore"},{"key":"e_1_2_13_3_1","doi-asserted-by":"publisher","DOI":"10.1051\/rnd:19820410"},{"key":"e_1_2_13_4_1","doi-asserted-by":"publisher","DOI":"10.1098\/rstb.1998.0238"},{"key":"e_1_2_13_5_1","doi-asserted-by":"publisher","DOI":"10.1002\/jmor.1051790105"},{"key":"e_1_2_13_6_1","doi-asserted-by":"publisher","DOI":"10.2307\/1542344"},{"key":"e_1_2_13_7_1","volume-title":"Microscopic Anatomy of Invertebrates","author":"Boxshall G. A.","year":"1992"},{"key":"e_1_2_13_8_1","doi-asserted-by":"publisher","DOI":"10.1080\/07924259.2009.9652293"},{"key":"e_1_2_13_9_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.asd.2009.06.002"},{"key":"e_1_2_13_10_1","doi-asserted-by":"publisher","DOI":"10.1007\/s002270050208"},{"key":"e_1_2_13_11_1","doi-asserted-by":"publisher","DOI":"10.1016\/0022-0981(78)90076-X"},{"key":"e_1_2_13_12_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.pocean.2007.01.009"},{"key":"e_1_2_13_13_1","doi-asserted-by":"publisher","DOI":"10.1111\/jmi.12540"},{"key":"e_1_2_13_14_1","doi-asserted-by":"publisher","DOI":"10.1007\/s00442-005-0346-3"},{"key":"e_1_2_13_15_1","doi-asserted-by":"publisher","DOI":"10.1007\/s003000050418"},{"key":"e_1_2_13_16_1","doi-asserted-by":"publisher","DOI":"10.1007\/s00227-006-0528-5"},{"key":"e_1_2_13_17_1","first-page":"1","article-title":"De crustaceis ex ordinibus tribus?: Cladocera, Ostracoda et Copepoda in Scania occurrentibus = om, De inom Sk\u00e5ne fk\u00f6rekommande crustaceer af ordningarne?: Cladocera, Ostracoda och Copepoda","volume":"184","author":"Lilljeborg W.","year":"1853","journal-title":"Berlingska Boktryckeriet"},{"key":"e_1_2_13_18_1","doi-asserted-by":"crossref","unstructured":"M\u00fcller O. F.1785.Entomostraca seu Insecta Testacea quae in aquis Daniae et Norvegiae reperit descripsit et iconibus illustravit Otho Fridericus M\u00fcller [The Entomostraca or Insecta Testacea Which he Finds in the Waters of Denmark and Norway Were Described and Illustrated by Icons by Otho Friedrich M\u00fcller] Vol.134.115\u2013116. F. W. Thiele.","DOI":"10.5962\/bhl.title.14414"},{"key":"e_1_2_13_19_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.pocean.2006.05.005"},{"key":"e_1_2_13_20_1","first-page":"14","volume-title":"Proceedings of the White Sea Biological Station of Moscow State University","author":"Pertsova N. M.","year":"1974"},{"key":"e_1_2_13_21_1","volume-title":"Life Cycles of the Dominant Copepod Species in the White Sea","author":"Pertsova N. 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